58 mJ burst containing ultra-short pulses with homogenous energy level from an Yb-doped fiber amplifier
Author(s):
Sven Breitkopf;
Arno Klenke;
Thomas Gottschall;
Hans-Jürgen Otto;
Cesar Jauregui;
Jens Limpert;
Andreas Tünnermann
Show Abstract
There is a great interest in obtaining laser pulses with a high average power as well as high pulse energies. Continuously pulsed systems face many problems to satisfy those requirements, independent on the amplifier concept. While many applications such as electron beam characterization and free-electron-laser seeding need high pulse energies at high repetition rates, they only need those laser pulses for a certain amount of time. Therefore, it is not necessary to run a laser system with continuous pulses at those parameters and a so-called burst mode might be sufficient and even essential in such cases. We report on a CPA-laser system, based on a large pitch fiber as a main-amplifier delivering bursts containing ultra-short, highly-energetic pulses. The burst rate is set to 20Hz, while each burst contains 2000 pulses at a pulse-repetition-rate of 10MHz and with a pulse-duration of 700fs. Hence the duty cycle D is 0.4%. To achieve a homogeneous pulse energy level between 27μJ and 31μJ after the compression, the main amplifier is pumped with a very high power of 1.6kW in a burst-mode (D=10%). By using an acousto-optical modulator (AOM) after the main-amp fiber, the residual output before and after the burst is removed to suppress ASE and any underground-pulses around the amplified burst. The limitations that could be observed during this experiment were mainly due to mode instabilities, which were detectable even on a very short time scale of a few hundred μs using a high speed camera.
High efficiency cascaded Raman fiber laser with output power of 204W at 1480 nm
Author(s):
V. R. Supradeepa;
Jeffrey W. Nicholson;
Clifford E. Headley;
Man F. Yan;
Bera Palsdottir;
Dan Jakobsen
Show Abstract
We demonstrate a 1480 nm cascaded Raman fiber laser with a new high efficiency architecture providing a record output power of 204 W. We achieve this through multiple Raman shifts of a high power 1117nm Yb-doped fiber laser in a single pass configuration mediated at all intermediate wavelengths using a seed source comprising a low power conventional 1480nm Raman laser. The conversion efficiency from 1117nm to 1480nm is ~65% (for a quantum limited efficiency of 75%). Enhancement in efficiency is achieved by elimination of excess optical loss present in the conventional cascaded Raman resonator based architecture.
High order ribbon fiber modes, simulations, and experiments for high power fiber amplifiers
Author(s):
Derrek Drachenberg;
Michael Messerly;
Paul Pax;
Arun Sridharan;
John Tassano;
Jay Dawson
Show Abstract
Diffraction limited fiber amplifiers in a circular geometry are likely to be limited by nonlinearities to 2 kW for narrowband and 10-36 kW for broadband lasers. We have proposed a ribbon fiber geometry to allow scaling fiber lasers above these limits in which a high order ribbon mode is amplified and converted back to the fundamental mode in free space. Novel methods of illuminating a high order ribbon fiber mode are discussed and compared with modeling and experimental results showing high purity illumination, > 90%. A 10 kW single frequency ribbon fiber amplifier design is presented and BPM simulation results verify the approach.
Mode instability thresholds of fiber amplifiers
Author(s):
Arlee V. Smith;
Jesse J. Smith
Show Abstract
We show by detailed numerical modeling that stimulated thermal Rayleigh scattering can account for the modal instability observed in high power fiber amplifiers. Our model illustrates how the instability threshold power can be maximized by eliminating amplitude and phase modulation of the signal seed light and the pump light and by careful injection of the signal seed light. We also illustrate the influence of photodarkening and mode specific loss.
Analytical time-dependent theory of thermally induced modal instabilities in high power fiber amplifiers
Author(s):
I-Ning Hu;
Cheng Zhu;
Chao Zhang;
Alexander Thomas;
Almantas Galvanauskas
Show Abstract
A time-dependent analytical model is rigorously derived which shows that the thermally induced modal instability in high power rare-earth doped fiber amplifiers is fundamentally a two-wave mixing between fundamental and higher-order modes through a thermally-induced grating imprinted by beating between these modes. We show that previously postulated movement of this grating to phase-match the coupling between the modes naturally occurs due to a finite thermal-response time of a fiber. This theory is consistent with experimental observations in that it accurately predicts the onset-like threshold and temporal instabilities in the kilohertz-frequency range.
Mitigation of mode instabilities by dynamic excitation of fiber modes
Author(s):
Hans-Jürgen Otto;
Cesar Jauregui;
Fabian Stutzki;
Florian Jansen;
Jens Limpert;
Andreas Tünnermann
Show Abstract
By dynamically varying the power content of the excited fiber modes of the main amplifier of a fiber-based MOPA system at high average output power levels, it was possible to mitigate mode instabilities to a large extent. In order to achieve the excitation variation, we used an acousto-optic deflector in front of the Yb-doped rod-type fiber. Therewith, it was possible to significantly increase both the average and the instantaneous minimum power content of the fundamental mode. This, consequently, led to a substantial improvement of the beam quality and pointing stability at power levels well beyond the threshold of mode instabilities.
Mode instabilities: physical origin and mitigation strategies
Author(s):
Cesar Jauregui;
Hans-Jürgen Otto;
Florian Jansen;
Fabian Stutzki;
Tino Eidam;
Jens Limpert;
Andreas Tünnermann
Show Abstract
The phenomenon of mode instabilities has quickly become the most limiting effect for a further scaling of the average power of fiber laser systems. It is important to get a detailed understanding of its physical origin in order to develop efficient mitigation strategies. In this work we present an analysis of the different physical processes that give rise to mode instabilities and reveal that thermally-induced non-adiabatic waveguide changes play a key role. With this insight in the physical processes underlying mode instabilities a semi-analytic formula is obtained and several mitigation guidelines will be presented and discussed.
Design evolution, long term performance and application tests of extra large mode area (XLMA) fiber lasers
Author(s):
Andreas Langner;
Mario Such;
Gerhard Schötz;
Florian Just;
Martin Leich;
Stephan Grimm;
Jan Dellith;
Matthias Jäger;
Kay Schuster;
Hagen Zimer;
Marcin Kozak;
Björn Wedel;
Georg Rehmann;
Charley Bachert;
Volker Krause
Show Abstract
XLMA fibers based on Yb-doped bulk silica possess an excellent refractive index and doping level homogeneity [1]. To
achieve the highest optical-to-optical efficiency and long-term operation without degradation we simulated the effect of the brightness conversion factor of different core dopant compositions of such XLMA fibers. We also investigated the beam quality of a multi-kW single XLMA fiber laser system and its long-term stability. The current state-of-the-art
XLMA single fiber laser has 5 kW maximum output power and a degradation rate of about 0.5 % / 500 h at 4 kW
measured over a period of 1700 h. Several application tests demonstrate the excellent performance of the XLMA fiber
laser.
Bismuth-doped optical fibers: a new active medium for NIR lasers and amplifiers
Author(s):
Evgeny M. Dianov
Show Abstract
It has recently been demonstrated that Bi-doped glass optical fibers are a promising active laser medium. In this paper the luminescence and absorption spectra of various types of Bi-doped optical fibers are presented. The exact nature of the near IR emitting bismuth centers is still unclear, so some hypotheses and recent experimental results on this subject are discussed. Then the paper reviews the recent results regarding the development of Bi-doped fiber lasers and optical amplifiers for the 1150 to 1550 nm spectral region. In conclusion some problems to be solved to get an efficient laser medium on the base of Bi-doped fibers are identified.
All-glass optical fibers derived from sapphire
Author(s):
Peter D. Dragic;
Thomas Hawkins;
Paul Foy;
Stephanie Morris;
John Ballato
Show Abstract
Increasing power levels and novel applications are demanding from fibers performance capabilities that have, to date,
not been realized. One such example arises from the nascent push towards the 10-kW power threshold for narrow linewidth fiber lasers designed for applications including coherently-phased laser arrays and spectroscopic lidars. It is well-known that Brillouin scattering still restricts continued power scaling in these systems, despite several recent advances in acoustic-wave Brillouin management. Accordingly, novel fibers possessing a Brillouin gain coefficient 10 dB or more less than previously demonstrated would be of great practical benefit if they comprise novel materials in simple geometries and are manufactured using industry-accepted methods. Introducing a new and effective approach to the management of Brillouin scattering, we present on all-glass optical fibers derived from silica-clad sapphire with alumina concentrations up to 55 mole percent; considerably greater than conventionally possible enabling the design of optical fiber possessing a series of essential properties. Markedly, a Brillouin gain coefficient of 3.1 × 10-13 m/W was measured for a fiber with an average alumina concentration of 54 mole percent. This value is nearly 100 times lower than standard commercial single-mode fiber and is likely the lowest ever specified value. This reduction in Brillouin gain is enabled by a number of key material properties of the alumina-silica system, amazingly even leading to a predicted, but not yet demonstrated, composition with zero Brillouin gain. Optical fiber materials with these and other crucial properties will be discussed in the context high energy fiber laser systems.
Longitudinally graded optical fibers
Author(s):
A. Evert;
A. James;
T. Hawkins;
P. Foy;
L. Dong;
R. Stolen;
J. Ballato;
P. Dragic;
R. Rice
Show Abstract
Described herein, for the first time to the best of our knowledge, are results on optical fibers possessing significant compositional gradations along its length due to longitudinal control of the core glass composition. More specifically, MCVD-derived germanosilicate fibers were fabricated that exhibited a gradient of up to about 0.55 weight % GeO2 per meter. These gradients are about 1900 times greater than previously reported fibers possessing longitudinal changes in composition. The refractive index difference is shown to change by about 0.001, representing a numerical aperture change of about 10%, over a fiber length of less than 20 m. The lowest attenuation measured from the present longitudinally-graded fiber (LGF) was 82 dB/km at a wavelength of 1550 nm, though this is shown to result from extrinsic process-induced factors and could be reduced with further optimization. The stimulated Brillouin scattering (SBS) spectrum from the LGF exhibited a 4.4 dB increase in the spectral width, and thus reduction in Brillouin gain, relative to a standard commercial single mode fiber, over a fiber length of only 17 m. The method employed is very straight-forward and provides for a wide variety of longitudinal refractive index and acoustic velocity profiles, as well as core shapes, which could be especially valuable for SBS suppression in high-energy laser systems. Next generation analogs, with longitudinally-graded compositional profiles that are very reasonable to fabricate, are shown computationally to be more effective at suppressing SBS than present alternatives, such as externally-applied temperature or strain gradients.
Real-time mode analysis of fiber-to-fiber coupling processes using the correlation filter method
Author(s):
Daniel Flamm;
Philipp Gelszinnis;
Christian Schulze;
Siegmund Schröter;
Michael Duparré
Show Abstract
We use the correlation filter method for mode analysis and characterize a fiber coupling process modally resolved. In our experiment light is coupled from a single-mode fiber into a multi-mode fiber. During the coupling process the transverse position of the single-mode fiber towards the multi-mode fiber is varied and the actually guided mode content is measured simultaneously. This measurement process allows to maximize the power guided by the fundamental mode and, hence, to achieve most brilliant beam quality in real-time.
Nonlinear spatial mode imaging of hybrid photonic crystal fibers
Author(s):
S. R. Petersen;
T. T. Alkeskjold;
M. Laurila;
T. V. Andersen;
J. Lægsgaard
Show Abstract
Degenerate spontaneous four wave mixing is studied for the rst time in a large mode area hybrid photonic crystal ber, where light con nement is achieved by combined index- and bandgap guiding. Four wave mixing products are generated on the edges of the bandgaps, which is veri ed by numerical and experimental results. Since the core mode is in resonance with cladding modes near the bandedges an unconventional measurement technique is used, in this work named nonlinear spatial mode imaging.
Strong excited state absorption (ESA) in Yb-doped fiber lasers
Author(s):
Magnus Engholm;
Sara Rydberg;
Krister Hammarling
Show Abstract
Excited state absorption (ESA) measurements performed on Yb-doped silica bers show the onset of a strong absorption band in the visible range. In this work, we perform experiments to investigate the possibility for ESA to be part of the induced optical losses (photodarkening) observed in Yb-doped ber lasers. Our results indicate that an ESA process, from the 2F5/2 excited state manifold in the Yb3+ ion to the charge-transfer state with absorption bands in the UV range, may constitute a transfer route for pump- and laser photons in the near-infrared range.
SESAM designs for ultrafast lasers
Author(s):
Clara J. Saraceno;
Cinia Schriber;
Mario Mangold;
Martin Hoffmann;
Oliver H. Heckl;
Cyrill R. E. Baer;
Matthias Golling;
Thomas Südmeyer;
Ursula Keller
Show Abstract
The invention of the semiconductor saturable absorber mirror (SESAM) nearly 20 years ago was a major advancement
for the development of ultrafast laser systems. Today, SESAMs have become key devices for modelocking of numerous
laser types, including DPSSLs, fiber lasers, and semiconductor lasers. Semiconductors are ideally suited as saturable
absorbers because they can cover a broad wavelength range and yield short recovery times, supporting the generation of picosecond to femtosecond pulse durations. The macroscopic nonlinear optical parameters for modelocking can be optimized over a wide range by the design of the mirror structure and the choice of the semiconductor absorber. Furthermore, their damage threshold can be controlled making them ideally suited for high-power levels. In this presentation, we will focus on recent advances in SESAMs for cutting-edge ultrafast lasers. In particular, we will focus on recent damage and lifetime investigations of SESAMs designed for high-power oscillators. We will present guidelines for robust SESAMs in a large range of saturation parameters, and give an outlook towards novel SESAM designs that will enable future kW-level ultrafast oscillators.
Femtosecond pulse inscription of a selective mode filter in large mode area fibers
Author(s):
Ria G. Krämer;
Christian Voigtländer;
Erik Freier;
Andreas Liem;
Jens U. Thomas;
Daniel Richter;
Thomas Schreiber;
Andreas Tünnermann;
Stefan Nolte
Show Abstract
We present a selective mode filter inscribed with ultrashort pulses directly into a few mode large mode area (LMA) fiber. The mode filter consists of two refractive index modifications alongside the fiber core in the cladding. The refractive index modifications, which were of approximately the same order of magnitude as the refractive index difference between core and cladding have been inscribed by nonlinear absorption of femtosecond laser pulses (800 nm wavelength, 120 fs pulse duration). If light is guided in the core, it will interact with the inscribed modifications causing modes to be coupled out of the core. In order to characterize the mode filter, we used a femtosecond inscribed fiber Bragg grating (FBG), which acts as a wavelength and therefore mode selective element in the LMA fiber. Since each mode has different Bragg reflection wavelengths, an FBG in a multimode fiber will exhibit multiple Bragg reflection peaks. In our experiments, we first inscribed the FBG using the phase mask scanning technique. Then the mode filter was inscribed. The reflection spectrum of the FBG was measured in situ during the inscription process using a supercontinuum source. The reflectivities of the LP01 and LP11 modes show a dependency on the length of the mode filter. Two stages of the filter were obtained: one, in which the LP11 mode was reduced by 60% and one where the LP01 mode was reduced by 80%. The other mode respectively showed almost no losses. In conclusion, we could selectively filter either the fundamental or higher order modes.
Fabrication of a high power Faraday isolator by direct bonding
Author(s):
Carolin Rothhardt;
Miroslaw Rekas;
Gerhard Kalkowski;
Nicoletta Haarlammert;
Ramona Eberhardt;
Andreas Tünnermann
Show Abstract
With increasing output power of lasers, absorption in optical components grows larger and demands on heat withdrawal become challenging. We report on the fabrication of a Faraday isolator for high power fiber laser applications (P = 1 kW) at a wavelength of 1080 nm and operation at ambient conditions. We investigate direct bonding of Terbium Gallium Garnet to sapphire disks, to benefit from the good heat spreading properties (having a 6-fold higher thermal conductivity than TGG) at high transparency of the latter. Successful bonding was achieved by extensive cleaning of the plane and smooth surfaces prior to low pressure plasma activation. The surfaces to be bonded were then contacted in a vacuum environment at elevated temperature under axial load. Our measurements show that the bonded interface has no measurable influence on transmission properties and bonded samples are stable for laser output powers of at least 260 W. As compared to a single Terbium Gallium Garnet substrate, wavefront aberrations were significantly decreased by bonding sapphire disks to Terbium Gallium Garnet.
Thermal-recovery of modal instability in rod fiber amplifiers
Author(s):
Mette Marie Jørgensen;
Marko Laurila;
Danny Noordegraaf;
Thomas Tanggaard Alkeskjold;
Jesper Lægsgaard
Show Abstract
We investigate the temporal dynamics of Modal instabilities (MI) in ROD fiber amplifiers using a 100 μm core rod fiber in a single-pass amplifier configuration, and we achieve ~200W of extracted output power before the onset of MI. Above the MI threshold, we investigate the temporal dynamics of beam fluctuations in both the transient and chaotic regime. We identify a set of discrete frequencies in the transient regime and a white distribution of frequencies in the chaotic regime. We test three identical rods using a multiple ramp-up procedure, where each rod is tested in three test series and thermally annealed between each test series. We find that the MI threshold degrades as it is reached multiple times, but is recovered by thermal annealing. We also find that the test history of the rods affects the temporal dynamics.
Stimulated Brillouin scattering suppression in optical fibers by hydrogen-loading technique
Author(s):
Fanting Kong;
Liang Dong
Show Abstract
Further power scaling of single frequency fiber lasers is of significant interests for many scientific and defense applications. It is currently limited by stimulated Brillouin scattering (SBS). In recent years, a variety of techniques have been investigated for the suppression of SBS in optical fibers. A notable example is to design transverse acoustic properties of optical fibers in order to minimize optical and acoustic mode overlap. It was pointed out recently that SBS suppression from such transverse acoustic tailoring is limited when considering the existence of acoustic leaky modes. We demonstrate, for the first time, a post-processing technique where hydrogen is diffused in to a fiber core and then locally and permanently bonded to core glass by a subsequent UV exposure. Large local acoustic property can be altered this way for significant SBS suppression. It is also possible to use this technique to implement precisely tailored acoustic properties along a fiber for more optimized SBS suppression in a fiber amplifier. Change in Brillouin Stokes frequency of ~320MHz at 1.064μm has been demonstrated using hydrogen, corresponding to a SBS suppression of ~8dB. Much higher SBS suppression is possible at higher hydrogen concentrations.
Single-frequency ytterbium-doped fiber laser at 976 nm
Author(s):
X. Zhu;
W. Shi;
J. Zong;
D. Nguyen;
R. A. Norwood;
A. Chavez-Pirson;
N. Peyghambarian
Show Abstract
Linearly polarized wavelength stable single frequency ytterbium (Yb3+) doped fiber lasers below 1 μm, namely threelevel Yb3+ fiber lasers, are highly demanded for nonlinear wavelength conversion to generate coherent blue light or even deep ultraviolet coherent sources. We present performance of a 976 nm single-frequency core-pumped distributed Bragg reflector (DBR) fiber laser consisting of a 2-cm long highly ytterbium-doped phosphate fiber and a pair of silica fiber Bragg gratings (FBGs) and their use for frequency doubling experiment. The high reflection (HR > 99%) and partial reflection (PR = 60%) FBGs were cleaved very close to the index modulation region and directly spliced to a 2-cm-long highly Yb3+-doped phosphate fiber. Over 100 mW of linearly polarized output with a linewidth less than 2 kHz can be obtained when the launched pump power is about 450 mW. The efficiency of the 976 nm single-frequency fiber laser (the output power vs the launched pump power) is about 25%. The relative intensity noise was measured to be -110 dB/Hz at 1 MHz and the variation of the center wavelength is less than 0.0005 nm during a measurement period of 2.5 hours. This single-frequency fiber laser has an SNR of over 50 dB and there is no strong ASE or spurious lasing at long wavelengths even at the maximum pump power. This all-fiber single-frequency DBR laser with attractive features can be used for efficient blue and UV generation through nonlinear frequency conversion. Moreover, this high-performance 976 nm single-frequency fiber laser can be used as a single-frequency, low RIN pump laser for long wavelength Yb3+-, Er3+-, or Yb3+/Er3+-doped fiber lasers and amplifiers.
Single-frequency, single-polarization holmium-doped ZBLAN fiber laser
Author(s):
X. Zhu;
J. Zong;
A. Miller;
K. Wiersma;
R. A. Norwood;
N. S. Prasad;
A. Chavez-Pirson;
N. Peyghambarian
Show Abstract
We present the performance of a single frequency, single-polarization holmium (Ho3+)-doped ZBLAN (ZrF4-BaF2-LaF3- AlF3-NaF) fiber laser at 1200 nm. This distributed Bragg reflector (DBR) fiber laser was developed by splicing a 22 mm long highly Ho3+-doped ZBLAN fiber to a pair of silica fiber Bragg gratings (FBG). The successful fusion splicing of silica fiber to ZBLAN fiber, with their very different melting temperatures, was accomplished by using NP Photonics proprietary splicing technique. The 3 mol% Ho3+-doped ZBLAN fiber had a core diameter of 6.5 μm and a cladding diameter of 125 μm. The threshold of this laser was seen to be about 260 mW, and when the pump power was 520 mW, the output power was about 10 mW. The efficiency of the 1200 nm single-frequency fiber laser, i.e. the ratio of the output power to the launched pump power, was about 3.8%. The linewidth of the 1200 nm single-frequency fiber laser was estimated to be about 100 kHz by comparing the measured frequency noise of the 1200 nm single-frequency fiber laser with that of 1 μm NP Photonics single-frequency fiber lasers whose linewidths have been measured to be in the 1- 10 kHz range. The relative intensity noise of this DBR all-fiber laser was measured to be < 110 dB/Hz at the relaxation oscillation peak and the polarization extinction ratio was measured to be > 19 dB. Due to its low phonon energy and long radiative lifetimes, rare-earth-doped ZBLAN allows various transitions that are typically terminated in silica glass, resulting in ultraviolet, visible, and infrared rare-earth doped ZBLAN lasers. Therefore, our results highlight the exciting prospect that the accessible wavelength range of single-frequency DBR fiber lasers can be expanded significantly by using rare-earth-doped ZBLAN fibers.
Pseudo-random binary sequency phase modulation in high power Yb-doped fiber amplifiers
Author(s):
Craig Robin;
Iyad Dajani;
Clint Zernigue;
Angel Flores;
Ben Pulford;
Ann Lanari;
Shadi Naderi
Show Abstract
We present experimental and theoretical studies on the stimulated Brillouin scattering (SBS) threshold in fiber amplifiers seeded with a spectrally broadened single-frequency laser source. An electro-optic phase modulator is driven with various pseudo-random binary sequence (PRBS) patterns to highlight the unique characteristics of this linewidth broadening technique and its facility in SBS mitigation. Theoretical predictions show a variation in SBS suppression based on PRBS pattern and modulation frequency. These predictions are experimentally investigated in a kilowatt level monolithic fiber amplifier operating with near diffraction-limited beam quality. We also show Rayleigh scattering and other sources of back reflected light in phase modulated signals can seed the SBS process and significantly reduce the nonlinear threshold.
Single frequency, ultra-low noise, CW, 4W 488nm fiber laser
Author(s):
R. Dubrasquet;
J. Boullet;
S. Lugan;
G. Mery;
M. Castaing;
N. Traynor;
E. Cormier
Show Abstract
We have recently developed an industrial laser platform emitting in the non-conventional range around 976 nm. This 15 W continuous wave spatially single mode linearly polarized fiber laser can be forced to work in narrow line width or single frequency configuration. Its frequency doubling at 488 nm can be used to replace argon gas laser technology in many applications. We have studied the second harmonic generation of our source to verify its suitability with several industrial application needs in terms of efficiency, temporal stability and noise level.
High power industrial picosecond laser from IR to UV
Author(s):
Julien Saby;
Damien Sangla;
Simonette Pierrot;
Pierre Deslandes;
François Salin
Show Abstract
Many industrial applications such as glass cutting, ceramic micro-machining or photovoltaic processes require high average and high peak power Picosecond pulses. The main limitation for the expansion of the picosecond market is the cost of high power picosecond laser sources, which is due to the complexity of the architecture used for picosecond pulse amplification, and the difficulty to keep an excellent beam quality at high average power. Amplification with fibers is a good technology to achieve high power in picosecond regime but, because of its tight confinement over long distances, light undergoes dramatic non linearities while propagating in fibers. One way to avoid strong non linearities is to increase fiber’s mode area. Nineteen missing holes fibers offering core diameter larger than 80μm have been used over the past few years [1-3] but it has been shown that mode instabilities occur at approximately 100W average output power in these fibers [4]. Recently a new fiber design has been introduced, in which HOMs are delocalized from the core to the clad, preventing from HOMs amplification [5]. In these so-called Large Pitch Fibers, threshold for mode instabilities is increased to 294W offering robust single-mode operation below this power level [6]. We have demonstrated a high power-high efficiency industrial picosecond source using single-mode Large Pitch rod-type fibers doped with Ytterbium. Large Pitch Rod type fibers can offer a unique combination of single-mode output with a very large mode area from 40 μm up to 100μm and very high gain. This enables to directly amplify a low power-low energy Mode Locked Fiber laser with a simple amplification architecture, achieving very high power together with singlemode output independent of power level or repetition rate.
Spectrally beam combined fiber lasers for high power, efficiency, and brightness
Author(s):
Eric Honea;
Robert S. Afzal;
Matthias Savage-Leuchs;
Neil Gitkind;
Richard Humphreys;
Jason Henrie;
Khush Brar;
Don Jander
Show Abstract
Spectral Beam Combining (SBC) of fiber lasers provides a simple, robust architecture for power scaling lasers to high power. With appropriate designs, power scaling beyond the single fiber limit can be achieved while maintaining near diffraction limited beam quality and high efficiency. We present experimental results where we achieved > 3 kW at an M2 = 1.35 and > 39% E-O efficiency by combining 12 individual fiber lasers into a single high brightness beam.
Passive coherent beam combination of two nanosecond fiber amplifiers by using an all-optical feedback loop
Author(s):
Houkang Liu;
Jun Zhou;
Bing He;
Qihong Lou
Show Abstract
We demonstrate a passive coherent beam combination of two nanosecond amplifiers by using an all-optical feedback loop. An electro-optic amplitude modulator is utilized to tune the pulse width and the pulse repetition frequency of combined laser pulse. The positive correlation between the visibility of far-field coherent patterns and the pulse duty ratio is found. The range of tunable pulse repetition frequency is from 2.023 MHz to 6.069 MHz, and the range of tunable pulse width is from 10 ns to 50 ns. The maximum visibility is up to 85%. This approach presented here provides a promising way for power scaling of high power nanosecond fiber laser and maintaining beam quality simultaneously.
High average power fiber laser system for attosecond science
Author(s):
Jan Rothhardt;
Steffen Hädrich;
Stefan Demmler;
Manuel Krebs;
Jens Limpert;
Andreas Tünnermann
Show Abstract
The process of high harmonic generation allows for up-conversion of infrared laser light towards the EUV or soft X-ray
region. If very short (few-cycle) laser pulses are employed and their carrier envelope phase (CEP) is well controlled the
generation of so-called isolated attosecond pulses becomes feasible. Today’s few-cycle laser technology relies on Ti:Sapphire laser systems and hollow fiber based post-compression. The output power of such lasers is typically below
1 W and the repetition rate is limited to a few kilohertz due to thermo-optical limitations of the Ti:Sapphire amplifiers.
In this contribution we present a different approach combining the advantages of fiber laser technology with nonlinear frequency conversion. A high power femtosecond fiber laser system serves as pump laser for an ultrabroadband optical parametric amplifier. As a result we are able to generate intense CEP-stable pulses with only two optical cycles duration at repetition rates up to 0.6 MHz. The excellent beam quality ensured by the fiber based pump laser enables focusing of these pulses to high intensities, thus, allowing for the generation of high harmonics and attosecond pulses at exceptionally high repetition rates. We will present the design of the laser system and discuss specific challenges such as the broadband signal generation, the temporal synchronization of the pump laser and the carrier envelop phase stabilization. In addition, experimental results on high repetition rate XUV continuum generation will be presented, demonstrating the feasibility of our approach.
23 fs pulses at 250 W of average power from a FCPA with solid core nonlinear compression
Author(s):
Christoph Jocher;
Tino Eidam;
Steffen Hädrich;
Jens Limpert;
Andreas Tünnermann
Show Abstract
We report on a linear polarized high power femtosecond fiber chirped-pulse amplification (FCPA) system operating at 360 W of average power with an excellent beam quality (M2=1.2). A mode locked fiber oscillator with a repetition rate of 250 MHz seeds the FCPA system. The 265 fs pulses are shortened in time employing the nonlinear compression technique. An unprecedented combination of average power, pulse duration and repetition rate is reached with an excellent beam quality by using a solid-core photonic-crystal fiber nonlinear compression stage. Thereby, the peak power of the fiber chirped pulsed amplification system is close to the self-focusing threshold of fused silica (case of linear polarization). In order to avoid self-focusing the threshold is increased by changing the polarization from linear to circular. Finally, the second order dispersion is compensated with a chirped-mirror compressor reaching shorter pulse durations. We achieve pulse shortening by more than one order of magnitude down to 23 fs pulses, compressed pulse energy of 0.9 μJ and a peak power of 34 MW at an average power level of 250 W. At this power level we measure an excellent beam quality (M2=1.3). This system is an ideal laser source for studying high field physics, e. g. driving enhanced cavities for high-repetition-rate high-harmonic generation.
Picosecond passively mode-locked mid-infrared fiber laser
Author(s):
C. Wei;
X. Zhu;
R. A. Norwood;
K. Kieu;
N. Peyghambarian
Show Abstract
Mode-locked mid-infrared (mid-IR) fiber lasers are of increasing interest due to their many potential applications in spectroscopic sensors, infrared countermeasures, laser surgery, and high-efficiency pump sources for nonlinear wavelength convertors. Er3+-doped ZBLAN (ZrF4-BaF2-LaF3-AlF3-NaF) fiber lasers, which can emit mid-IR light at 2.65-2.9 μm through the transition from the upper energy level 4I11/2 to the lower laser level 4I13/2, have attracted much attention because of their broad emission range, high optical efficiency, and the ready availability of diode pump lasers at the two absorption peaks of Er3+ ions (975 nm and 976 nm). In recent years, significant progress on high power Er3+- doped ZBLAN fiber lasers has been achieved and over 20 watt cw output at 2.8 μm has been demonstrated; however, there has been little progress on ultrafast mid-IR ZBLAN fiber lasers to date. We report a passively mode-locked Er3+- doped ZBLAN fiber laser in which a Fe2+:ZnSe crystal was used as the intracavity saturable absorber. Fe2+:ZnSe is an ideal material for mid-IR laser pulse generation because of its large saturable absorption cross-section and small saturation energy along with the excellent opto-mechanical (damage threshold ~2 J/cm2) and physical characteristics of the crystalline ZnSe host. A 1.6 m double-clad 8 mol% Er3+-doped ZBLAN fiber was used in our experiment. The fiber core has a diameter of 15 μm and a numerical aperture (NA) of 0.1. The inner circular cladding has a diameter of 125 μm and an NA of 0.5. Both continuous-wave and Q-switched mode-locking pulses at 2.8 μm were obtained. Continuous-wave mode locking operation with a pulse duration of 19 ps and an average power of 51 mW were achieved when a collimated beam traversed the Fe2+:ZnSe crystal. When the cavity was modified to provide a focused beam at the Fe2+:ZnSe crystal, Q-switched mode-locked operation with a pulse duration of 60 ps and an average power of 4.6 mW was achieved. More powerful and narrower pulses are expected if the dispersion of the cavity can be properly managed.
Monolithic mid-infrared fiber lasers for the 2-4 μm spectral region
Author(s):
Vincent Fortin;
Martin Bernier;
Nicolas Caron;
Dominic Faucher;
Mohammed El-Amraoui;
Younès Messaddeq;
Réal Vallée
Show Abstract
A growing number of applications are calling for compact laser sources operating in the mid-infrared spectral region. A review of our recent work on monolithic fiber lasers based either on the use of rare-earth fluoride fibers or on Raman gain in both fluoride and chalcogenide glass fibers is presented. Accordingly, an erbium-doped double clad fluoride glass all-fiber laser operating in the vicinity of 3 μm is shown. In addition, we present recent results on the first demonstrations of both fluoride and chalcogenide Raman fiber lasers operating at 2.23 μm and 3.34 μm, respectively. It is shown that based on this approach, monolithic fiber lasers could be developed to cover the whole 2-4 μm spectral band.
Dynamics of ultra-long Brillouin fiber laser
Author(s):
Andrei A. Fotiadi;
Ivan Lobach;
Patrice Mégret
Show Abstract
We report on experimental studies of random lasing realized in optical fibers with the use of Brillouin amplification and Rayleigh backscattering employed as a distributed feedback instead of a cavity mirror. In our experiment 25-km-long high quality standard telecom single-mode fiber was employed for Rayleigh reflection uniformly distributed over all fiber length. We have observed a clear competition between a classical Brillouin scattering and Brillouin lasing. Presence of extended fluctuation-free fragments in the recorded oscilloscope traces highlights Stokes power statistics typical for laser radiation rather than for Brillouin process. The results of the experiments are in a perfect agreement with the model of Brillouin - Rayleigh cooperative process in long fibers.
Effective index numerical modelling of microstructured chalcogenide-glass fiber for frequency conversion to the mid-infrared band
Author(s):
Pierre Bourdon;
Anne Durécu;
Claire Alhenc-Gelas;
Laura Di Bianca;
Guillaume Canat;
Frédéric Druon
Show Abstract
Chalcogenide glass fibers offer broad transparency range up to the mid-infrared and high nonlinear coefficients making them excellent candidates for four wave mixing frequency conversion. However, the use of microstructured airchalcogenide fibers is mandatory to achieve phase-matching in such a fiber. Numerical modelling of the phase matching condition can be done using the simplified effective index model, initially developed and extensively used to design airsilica fibers.
In this paper, we investigate the use of the effective index model in the case of microstructured As2S3 and As2Se3 fibers. One essential step in the method is to evaluate the core radius of a step-index fiber equivalent to the microstructured fiber. Using accurate reference results provided by finite-element computation, we compare the different formulae of the effective core radius proposed in the literature and validated for air-silica fibers. As expected, some discrepancies are observed, especially for the highest wavelengths. We propose new coefficients for these formulae so that the effective index method can be used for numerical modelling of propagation in air-chalcogenide fibers up to 5 μm wavelength. We derive a new formula providing both high accuracy of the effective core radius estimate whatever the microstucture geometry and wavelength, as well as uniqueness of its set of coefficients. This analysis reveals that the value of the effective core radius in the effective index model is only dependent on the microstructure geometry, not on the fiber material. Thus, it can be used for air-silica or air-chalcogenide fibers indifferently.
3C Yb-doped fiber based high energy and power pulsed fiber lasers
Author(s):
Thomas Sosnowski;
Andrey Kuznetsov;
Robert Maynard;
Xiuquan Ma;
Cheng Zhu;
I-Ning Hu;
Almantas Galvanauskas;
Joona J. Koponen;
Timothy S. McComb
Show Abstract
3C fiber technology advances the performance frontier of practical, high-pulse-energy fiber lasers by providing very large core fibers with the handling and packaging benefits associated with single mode fibers. First-generation fibers demonstrate scaling to > 240 W average power coincident with 100-kW peak power in 1-mJ, 10-ns pulses while maintaining single-mode beam quality, polarized output, and efficiencies > 70%. Peak powers over 0.5 MW with negligible spectral distortion can be achieved with sub ns, near-transform-limited pulses. In-development second-generation 3C Yb-fiber based on core sizes around 55 μm1 have produced >8 mJ, 13 ns pulses with peak powers exceeding 600 kW.
A high-energy cladding-pumped 80 nanosecond Q-switched fiber laser using a tapered fiber saturable absorber
Author(s):
Sean W. Moore;
Daniel B. S. Soh;
Scott E. Bisson;
Brian D. Patterson;
Wen L. Hsu
Show Abstract
We report a passively Q-switched all-fiber laser using a large mode area (LMA) Yb3+-doped fiber cladding-pumped at 915 nm and an unpumped single-mode Yb3+-doped fiber as the saturable absorber (SA). The saturable absorber and gain fibers were first coupled with a free-space telescope to better study the composite system, and then fusion spliced with fiber tapers to match the mode field diameters. ASE generated in the LMA gain fiber preferentially bleaches the SA fiber before depleting the gain, thereby causing the SA fiber to act as a passive saturable absorber. Using this scheme we first demonstrate a Q-switched oscillator with 40 μJ 79 ns pulses at 1026 nm using a free-space taper, and show that pulses can be generated from 1020 nm to 1040 nm. We scale the pulse energy to 0.40 mJ using an Yb3+-doped cladding pumped fiber amplifier. Experimental studies in which the saturable absorber length, pump times, and wavelengths are independently varied reveal the impact of these parameters on laser performance. Finally, we demonstrate 60 μJ 81 ns pulses at 1030 nm in an all fiber architecture using tapered mode field adaptors to match the mode filed diameters of the gain and SA fibers.
High power amplification of a tailored-pulse fiber laser
Author(s):
Julien Saby;
Damien Sangla;
Stéphane Caplette;
Reynald Boula-Picard;
Mathieu Drolet;
Benoit Reid;
François Salin
Show Abstract
We demonstrate the amplification of a 1064nm pulse-programmable fiber laser with Large Pitch Rod-Type Fibers of various Mode field diameters from 50 to 70 μm. We have developed a high power fiber amplifier at 1064nm delivering up to 100W/1mJ at 15ns pulses and 30W/300μJ at 2ns with linearly polarized and diffraction limited output beam (M²<1.2). The specific seeder from ESI – Pyrophotonics Lasers used in the experiment allowed us to obtain tailored-pulse programmable on demand at the output from 2ns to 600ns for various repetition rates from 10 to 500 kHz. We could demonstrate square pulses or any other shapes (also multi-pulses) whatever the repetition rate or the pulse duration. We also performed frequency conversion with LBO crystals leading to 50W at 532nm and 25W at 355nm with a diffraction limited output. Similar experiments performed at 1032nm are also reported.
Destructive random backscattering pulses showing Brillouin signature in MOPA fiber laser systems
Author(s):
M. Melo;
M. O. Berendt;
J. M. Sousa
Show Abstract
The origin of random highly peaked backward pulses arising from(in) pulsed master oscillator power amplifier (MOPA)
fiber lasers systems is studied. These large amplitude short duration pulses when compared to the Rayleigh backscattering may lead to catastrophic failures. This paper presents a systematic study of the backscatter using different seed sources (externally and directly modulated) in a hardened MOPA setup and a delayed self-heterodyne RF domain spectrum analysis technique for its characterization. Fabry-Perot seeded non-polarization maintaining system is found to show hallmark Brillouin frequency shift. The frequency of occurrence strongly depends on the seed characteristics.
Applications of fiber lasers for remote sensing of atmospheric greenhouse gases
Author(s):
Jeremy T. Dobler;
Michael Braun;
James Nagel;
Valery L. Temyanko;
T. Scott Zaccheo;
F. Wallace Harrison;
Edward V. Browell;
Susan A. Kooi
Show Abstract
In 2004 ITT Exelis developed the Multifunctional Fiber Laser Lidar (MFLL) for measuring atmospheric CO2. This lidar relies on high efficiency telecom laser components and Erbium Doped Fiber Amplifiers (EDFA’s) to implement a unique Continuous Wave (CW) Intensity Modulated (IM) differential absorption lidar measurement. This same
approach has also been used to measure atmospheric O2 by replacing the EDFA’s with fiber Raman amplifier technology. The use of all fiber coupled components results in a highly reliable, flexible and robust instrument. The general architecture of the MFLL, its implementation for greenhouse gas measurements, and as a pseudorandom noise encoded altimeter system is reviewed. Results from a 2011 flight campaign on the NASA DC-8 aircraft which included CO2, O2, and PN altimetry using a single receiver for all three measurements are also discussed. In addition, an introduction to a novel variation of this approach that will enable greenhouse gas monitoring from a geostationary orbit is given. This paper provides a general overview of a set of applications for fiber lasers in the area of active remote sensing that have been developed by Exelis over the past several years.
Fiber laser based high-spectral resolution lidar for earth science measurements
Author(s):
Youming Chen;
Timothy Berkoff;
Frank Kimpel;
Mark Storm;
Raymond Hoff;
Shantanu Gupta
Show Abstract
We present a special high spectral resolution lidar (HSRL) by using a novel tunable fiber based transmitter. The transmitter can produce 50μJ pulse energy at 1064nm and >25μJ pulse energy at 532nm with 10 kHz repetition rate, 5ns pulse width, respectively. A key advantage of the transmitter is the frequency-tunability. The laser can be tuned over the Iodine absorption lines from 1111 to 1104. The laser has a ~130MHz linewidth at 1064nm close to the transform limit linewidth ~ 88MHz for a pulse width of 5ns. Even though it was not frequency locked, the laser has very good frequency stability, which is on the order of ~200MHz over minutes. The beam quality M2 is less than 1.5. All the preliminary transmitter parameters meet the basic requirements of a HSRL. The transmitter was implemented in UMBC’s lidar lab that includes a ceiling hatch to enable vertical propagation and viewing of transmitted laser beams into the atmosphere. The atmospheric measurement demonstrates good agreement of the signal to the model Rayleigh decay over the profile range with no significant deviations. Most importantly, these results show that the measurement successfully suppresses the Mie scattering from clouds while recovering the full molecular signal as expected.
Multi-wavelength S-band Tm:ZBLAN fiber lasers
Author(s):
B. Frison;
A. R. Sarmani;
L. R. Chen;
X. Gu;
M. Saad
Show Abstract
Tm3+-doped fluoride (ZBLAN) fibers offer amplification and lasing in a wide variety of wavelength ranges, including 810 nm, 1480 nm, 1900 nm, and 2300 nm.1 Amplification and lasing around 1480 nm through the 3H4→3F4 transition is of interest for extending the capacity of WDM transmission systems, as well as developing sources for pumping erbium-doped fiber and fiber Raman amplifiers. The 3H4→3F4 transition, however, poses a challenge due to its self terminating nature. As such, the 3F4 level can be depleted either by colasing at 1900 nm2 or by using upconversion pumping at 1064 nm. High-power 1480 nm Tm3+:ZBLAN fiber lasers with upconversion pumping at 1064 nm have been demonstrated.3-6 Recent research has focused on improving further the power conversion efficiency as well as the development of monolithic fiber lasers, e.g., by incorporating fiber Bragg gratings (FBGs) directly within the Tm3+: ZBLAN fiber gain medium.
Dual-wavelength and multi-wavelength sources can have many applications in instrumentation (e.g., component testing), LIDAR systems, and fiber optics sensing. There have been several reports of dual-wavelength Tm3+-doped fiber lasers. For example, Androz et al. demonstrated operation at 785 nm and 810 nm, corresponding to the 1G4→3H5 and 3H4→3H6
transitions, respectively, with a Tm3+:ZBLAN fiber gain medium.7 Wang et al. obtained dual-wavelength lasing around 2 μm with a tunable wavelength spacing from 1 nm – 40 nm in a Tm3+:silica fiber laser.8 We realized oscillation at 805 nm and 810 nm through the 3H4→3H6 transition in a Tm3+:ZBLAN fiber laser; we also reported wavelength switching capability as well as bistable operation in both single cavity and cascaded cavity configurations.9 In this paper, we
extend our work further and report a dual-wavelength Tm3+:ZBLAN fiber laser operating in the S-band. Wavelength spacings of 11 nm and as narrow as 0.6 nm are achieved in a linear cascaded cavity configuration with bidirectional upconversion pumping at 1064 nm.
Robust single-mode all solid photonic bandgap fibers with core diameter of 50 micron
Author(s):
Liang Dong;
Kunimasa Saitoh;
Fanting Kong;
Thomas Hawkins;
Devon Mcclane;
Guancheng Gu
Show Abstract
There are still very strong interests for power scaling in high power fiber lasers for a wide range of applications in medical, industry, defense and science. In many of these lasers, fiber nonlinearities are the main limits to further scaling. Although numerous specific techniques have studied for the suppression of a wide range of nonlinearities, the fundamental solution is to scale mode areas in fibers while maintaining sufficient single mode operation. Here the key problem is that more modes are supported once physical dimensions of waveguides are increased. The key to solve this problem is to look for fiber designs with significant higher order mode suppression. In conventional waveguides, all modes are increasingly guided in the center of the waveguides when waveguide dimensions are increased. It is hard to couple a mode out in order to suppress its propagation, which severely limits their scalability. In an allsolid photonic bandgap fiber, modes are only guided due to anti-resonance of cladding photonic crystal lattice. This provides strongly mode-dependent guidance, leading to very high differential mode losses. In addition, the all-solid nature of the fiber makes it easily spliced to other fibers. In this paper, we will show for the first time that all-solid photonic bandgap fibers with effective mode area of ~920μm2 can be made with excellent higher order mode suppression.
Hyperspectral optical fiber refractive index measurement spanning 2.5 octaves
Author(s):
Andrew D. Yablon;
Jayesh Jasapara
Show Abstract
Optical fiber refractive index profiles were measured across a 2.5 octave wavelength range (from 375 nm to 2100 nm)
using a single phase-shifting interferometer. This spectral range is more than a factor of 2 larger than previously reported multi-wavelength interferometers, and includes the pump and amplification bands of Er-doped, Yb-doped, Er:Yb-doped, and Tm-doped fibers. The apparatus can measure the material dispersion in a spatially-resolved manner that permits more accurate prediction of the fiber’s waveguide properties. The measurement wavelength can be tailored to optimize the beneficial or deleterious effects of material dispersion, optical resolution, and interferometric phase ambiguities.
Distinguishing dispersion from distributed scattering in S2 fiber mode analysis
Author(s):
J. Jasapara;
A. D. Yablon
Show Abstract
We introduce a new spectrogram approach for analyzing spatially- and spectrally-resolved interferometry (S2) data that overcomes the previously overlooked ambiguity between dispersion and distributed scattering. Traditionally, S2 yields a one-dimensional spectrum of inter-modal group delays between higher-order-modes (HOMs) and the dominant fundamental mode. According to this interpretation, inter-modal group delay broadening is considered to be a location signature of HOM scattering; for example, a narrow peak in the spectrum is interpreted to be a discrete scattering event whereas a broad feature is interpreted to be distributed scattering along the fiber. Since the inter-modal dispersion is high for weakly guided HOMs, discrete scattering events will also manifest as broadened features. For the first time, we demonstrate a spectrogram approach to S2 analysis in which the spectral interference data is analyzed over small staggered wavelength windows and the inter-modal group delay is plotted as a function of wavelength. In this new two-dimensional map the wavelength dependence of the inter-modal group delay produces an inclination of streaks traversing the spectrogram. This new perspective resolves the ambiguity as to whether group delay broadening is caused by fiber dispersion or distributed scattering that is inherent to the previous one-dimensional S2 mapping. The spectrogram is a more accurate map of mode conversion along the fiber length and is essential for evaluating high power fibers and devices. Results for standard telecom single mode fiber and a large-mode-area fiber are presented.
A high-peak power nanosecond all-fiber MOPA system at high-repetition rate
Author(s):
Chun-Lin Chang;
Po-Yen Lai;
Yen-Yin Li;
Shih-Hung Chen;
Sheng-Lung Huang
Show Abstract
By limiting the core diameter of 15 μm at maximum with NA=0.07±0.01 for the near-diffraction-limited output (V <3.6), we successfully generate the pulse with the peak power of 36 kW and the duration of 4.6 ns in FWHM at the repetition rate of 20 kHz. To the best of our knowledge, the signal pulse energy corresponding to 264 μJ is the highest to date in the diode-seeded 15-μm all-fiber MOPA system with the efficiency of 35%. The success in the energy/power scaling is attributed to the further raise of input energy for more extracted energy, the tradeoff between the Raman-limited signal energy and the amplifier slope efficiency for more signal energy ratio, and the proper adjustment of both pump wavelength and power for avoiding coat damage without forced cooling.
Precisely tunable L-band multi-wavelength fiber laser
Author(s):
Xuwei Qin;
Zhaoying Wang;
Cuiqin Gao;
Mei Sang;
Dongfang Jia;
Tianxin Yang
Show Abstract
In this paper, we propose a scheme on precisely tunable L-band multi-wavelength fiber laser. This fiber laser has two
main characteristics namely broad wavelength band, uniform power spectrum and precise electronic tunability. About 65 wavelengths output within ± 1.5dB power variation with 50GHz channel spacing in broad spectrum range can be obtained at room temperature. The measured optical signal noise ratio (OSNR) and line width of each wavelength are about 20dB and 345.5MHz respectively. Theses 65 wavelengths are able to be tuned simultaneously up or down in frequency domain with a tuning step ranging from 10 MHz to 14 GHz. The tuning resolution can potentially be as low as 1 Hz in our experiment.
Fundamental mode evolution in long, large-core (>100 μm) adiabatic tapers
Author(s):
Juho Kerttula;
Valery Filippov;
Yuri Chamorovskii;
Vasily Ustimchik;
Oleg G. Okhotnikov
Show Abstract
We have experimentally investigated fundamental mode propagation in few-meter-long adiabatic step-index tapers with high numerical aperture, core diameter up to 117μm (V=38), and tapering ratio up to 18. We confirmed single fundamental mode guiding in tapers with uniform core index profile by several experiments. We observed an annular near field distribution and degraded beam quality for large output core diameters, found to occur due to intrinsic mechanical stress in the fibers. We expect that eliminating the stress would prevent the mode deformation and allow constructing single-mode, diffraction-limited tapered large-mode-area amplifiers with a good beam shape.
Modal instability of rod fiber amplifiers: a semi-analytic approach
Author(s):
Mette Marie Jørgensen;
Kristian Rymann Hansen;
Marko Laurila;
Thomas Tanggaard Alkeskjold;
Jesper Lægsgaard
Show Abstract
The modal instability (MI) threshold is estimated for four rod fiber designs by combining a semi-analytic model with the finite element method. The thermal load due to the quantum defect is calculated and used to numerically determine the mode distributions on which the expression for the onset of MIs is highly dependent. The relative intensity noise of the seed laser in an amplifier setup is used to seed the mode coupling between the fundamental and higher order mode, and lead to MI threshold values of 174 W – 348 W of extracted output power for the four rod fibers having core diameters in the range 53 μm – 95 μm.
Graphene thickness-dependent Er-doped Q-switched optical fiber laser
Author(s):
Xiaolong Wang;
Mei Sang;
Pan Zhu;
Ke Liu;
Tianxin Yang
Show Abstract
A stable Q-switched laser is useful in the area of remote sensing, range finding, optical imaging, material processing, and fiber communications. With its excellent linear and nonlinear optical characteristics, graphene has been proven to be an attractive material to generate nanosecond, picosecond and femtosecond laser pulses. It has a lot of advantages, such as lower saturation intensity, larger saturable-absorption modulation depth, higher damage threshold, sub-picosecond recovery time and an ultrabroad wavelength-independent saturable-absorption range. In this paper, we demonstrate a graphene based Q-switched fiber laser. Graphene was deposited on the fiber interface by the optically driven deposition method. The thickness of the graphene can be controlled by changing depositing time. The compact Q-switched erbium-doped fiber laser based on graphene operated stably, and got Q-switched pulse sequences output with the repetition rate of 19KHz and the average power of 1.4mW when pump power is 40mW. Higher peak power, shorter pulse duration, and higher repetition rate could be achieved by adjusting the thickness of the graphene layer appropriately. Besides, the pulse duration and output power is proved to be a function of the pump power. The repetition rate of this fiber laser had a characteristic of monotonically increasing, near-linear with the changing of pump power. The stable Q-switching pulse output can be observed on the oscilloscope with differently specific repetition rate and pump power. Theory analysis of this fiber laser and further improvement methods is also studied combined with the experimental results.
System technology for laser-assisted milling with tool integrated optics
Author(s):
Jan-Patrick Hermani;
Michael Emonts;
Christian Brecher
Show Abstract
High strength metal alloys and ceramics offer a huge potential for increased efficiency (e. g. in engine components for aerospace or components for gas turbines). However, mass application is still hampered by cost- and time-consuming end-machining due to long processing times and high tool wear. Laser-induced heating shortly before machining can reduce the material strength and improve machinability significantly. The Fraunhofer IPT has developed and successfully realized a new approach for laser-assisted milling with spindle and tool integrated, co-rotating optics. The novel optical system inside the tool consists of one deflection prism to position the laser spot in front of the cutting insert and one focusing lens. Using a fiber laser with high beam quality the laser spot diameter can be precisely adjusted to the chip size. A high dynamic adaption of the laser power signal according to the engagement condition of the cutting tool was realized in order not to irradiate already machined work piece material. During the tool engagement the laser power is controlled in proportion to the current material removal rate, which has to be calculated continuously. The needed geometric values are generated by a CAD/CAM program and converted into a laser power signal by a real-time controller. The developed milling tool with integrated optics and the algorithm for laser power control enable a multi-axis laser-assisted machining of complex parts.
Yb-doped phosphate double-cladding optical fiber for high-power laser applications
Author(s):
E. Mura;
G. C. Scarpignato;
J. Lousteau;
N. G. Boetti;
S. Abrate;
D. Milanese
Show Abstract
A Yb-doped phosphate glass double cladding optical fiber was prepared using a custom designed glass composition (P2O5 - Al2O3 - Li2O - B2O3 - BaO - PbO - La2O3) for high-power amplifier and laser applications. The preform drawing method was followed, with the preform being fabricated using the rotational casting technique. This technique, previously developed for tellurite, fluoride or chalcogenide glass preforms is reported for the first time using rare earth doped phosphate glasses. The main challenge was to design an adequate numerical aperture between first and second cladding while maintaining similar thermo-mechanical properties in view of the fiber drawing process. The preform used for the fiber drawing was produced by rod-in-tube technique at a rotation speed of 3000 rpm. The rotational casting technique allowed the manufacturing of an optical fiber featuring high quality interfaces between core and internal cladding and between the internal and external cladding, respectively. Loss attenuation was measured using the cut-back method and lasing was demonstrated at 1022 nm by core pumping with a fiber pigtailed laser diode at the wavelength of 976 nm.
Experimental and theoretical study of gain switched Yb-doped fiber laser
Author(s):
Rok Petkovšek;
Vid Agrež;
Ferdinand Bammer;
Peter Jakopič;
Borut Lenardič
Show Abstract
First pulse of relaxation oscillations that appear after the start of the pumping can be used to realize an efficient pulsed laser based on gain switching. Because there is no need for any additional active optical element this can be very simple and robust technique to produce nanosecond pulses. Together with fiber technology it can produce compact and reliable lasers appropriate for industrial applications such as micro-processing. However, to produce pulses with appropriate peak power and duration, one must carefully design such systems. We report on a numerical model that describes time and spatial dependencies of photon and ion populations which was developed to enable design and optimization of a gainswitched fiber laser. The peak pump power influence on basic output laser pulse parameters is presented in this paper. To confirm theoretical result an experimental setup was built around double clad ytterbium doped fiber laser.
Heating power feedback control for CO2 laser fusion splicers
Author(s):
Wenxin Zheng;
Hiroshi Sugawara;
Toshirou Mizushima;
William Klimowych
Show Abstract
A novel feedback control method has been developed for an automated splicer using a CO2 laser as the heating element. The feedback method employs a sensor for laser beam power and CMOS cameras as sensors for fiber luminescence which is directly related to glass temperature. The CO2 laser splicer with this type of feedback system provides a consistent platform for the fiber laser and bio-medical industry for fabrication of fused glass components such as tapers, couplers, combiners, mode-field adaptors, and fusion splices. With such a closed loop feedback system, both splice loss and peak-to-peak taper ripple are greatly reduced.
Investigation of temperature influence on output performances of high-power cladding-pumped Er,Yb co-doped fiber laser
Author(s):
Wenting Chen;
Jianjian Sha;
Yong Wang;
Deyuan Shen
Show Abstract
Effect of the fiber’s temperature on lasing performance is investigated in high-power, cladding-pumped Er, Yb co-doped fiber laser system. A three-layer symmetric cylindrical model is applied to describe the temperature distribution of the fiber under natural air convection. Radial temperature distribution of the fiber is calculated with consideration of the quantum defect heat, the heat from the absorption of spontaneous emission, and the convection and radiation at the heat transfer boundaries. The steady-state theoretical model based on rate equations takes into account of the energy transfers between Er3+-ions and Yb3+-ions and a fraction of nonparticipatory Yb3+-ions. Shooting method and Newton iteration method are used to solve the boundary-value problems under different environmental temperatures, pump powers and reflectivities at the fiber ends. Numerical simulations are consistent with experimental results and show that increasing the fiber’s temperature is an effective strategy to suppress the 1 μm parasitic lasing and improve the lasing performance at 1.5 μm, a similar phenomenon is found with enhancing doping concentrations of the two ions and decreasing the reflectivities at the fiber ends. Our numerical results present a theoretical guideline for further improving the laser performance in terms of output power of ~1.5 μm in high-power Er,Yb-doped fiber laser systems.
Mode coupling in large-diameter multi-mode silica optical fibers
Author(s):
Changgeng Ye;
Joona Koponen;
Ville Aallos;
Teemu Kokki
Show Abstract
We report an experimental study on mode coupling in various large-diameter multi-mode silica optical fibers. The
evolution of the far-field angular power distribution is experimentally measured, and the mode coupling characteristics are studied on a variety of fibers with diverse parameters, including core/cladding diameter (50-400μm/125-480μm), length (few to hundreds of meters), NA (0.15-0.46), etc. The influences of fiber geometry, bending are discussed. This study could provide practical guidance in designing power delivery fibers for high-power diode, solid-state and fiber lasers to preserve the input brightness and beam quality.
Tunable actively Q-switched fiber laser based on fiber Bragg grating
Author(s):
A. González-García;
B. Ibarra-Escamilla;
E. A. Kuzin;
M. Durán-Sánchez;
O. Pottiez;
F. Maya-Ordoñez
Show Abstract
We report a tunable actively Q-switched fiber laser. A Fabry-Perot cavity is formed by a tunable fiber Bragg grating and two short-wave pass dichroic mirrors, (SWP-0-R1550-T1064-0525-C) and (SWP-45-RU1550- TU1064-PW-0525-C) incident angles, with high reflectivity (<99.5%) at 1550-nm and high transmission (<90%) at 1064-nm. The Er3+/Yb3+ double-clad fiber was pumped by a high power diode laser (JOLD-30-FC-12-976). The diode laser has output fiber with a core diameter and numerical aperture of 200-μm and 0.22, respectively. The Er3+/Yb3+ fiber has a core diameter of 7-μm and numerical aperture of 0.17. The pump was coupled into the doped fiber through the collimating aspherical lens with focal distance 18-mm, 45° dichroic mirror, focusing aspheric lens with focal distance of 8-mm, and a 7.5° cleave at one end of the doped fiber. The use of aspherical lenses allows reducing the spherical aberration caused by the large numerical aperture of the fibers and increasing the coupling efficiency for both pump and signal. An acousto-optic IR modulator with a diffraction efficiency of <60% at first order was inserted in the cavity. The pump power used in experiments was limited to a maximum power of 5-W. The laser was tunable over 5-nm in the wavelength region of 1550-nm with a wavelength selectivity of 0.8-nm from 1549 to 1544-nm. The Q-switch operation was achieved at pulse repetition rate of 120- kHz. Average output power was 1-W at 5-W of pump with a pulse duration of 530-ns.
Sm3+ effects in the Tm3+ doped tellurite glass for S-band amplification
Author(s):
Marcos P. Belançon;
Julio Ferenz;
Enver Chillcce;
Luis Carlos Barbosa
Show Abstract
Thulium doped Samarium codoped tellurite-tungstate glasses were produced. Luminescence properties in the infrared region were investigated looking to observe improved properties for S-band amplification in the co doped samples. Thulium is well-known by the 3H4-3F4 radiative transition emitting around ~1.47μm, which is a self-terminating transition in tellurite hosts due the longer lifetime of the lower level in relation to the upper level of this transition. Analysis of absorption and emission spectra showed that we could quench the 3F4 level significantly, what improved the intensity of the emission at 1.49μm. However, the state 3H4 were also quenched due the cross relaxation process due the absorption bands of Sm3+ around 1.5μm.
Spectroscopic investigation of the glass system TeO2-WO3-Na2O-Nb2O5 for mid-infrared amplifiers
Author(s):
Marcos P. Belançon;
Luis Carlos Barbosa
Show Abstract
Tellurite glasses following the molar concentration 71.5% TeO2, 22.5% WO3, 5% Na2O and 1.5% Nb2O5 have been investigated. Samples doped with Tm2O3, Pr2O3, Yb2O3 or Bi2O3 were fabricated by the conventional melt quenching process. Rare-earth (RE) 3+ ions have well defined emission bands. On the other hand, Bismuth emission in the infrared region have been found in some glasses and even that emission laser have been already obtained, the mechanism behind its luminescence is still misunderstood[1]. The Bismuth emission is sometimes referred as a “superbroadband” emission around 1.3um, which is very promising for an optical amplifier, but, to the best of our knowledge a bismuth based optical amplifier have not been produced yet. Our purpose is to investigate the mechanism behind this misunderstood “superbroadband” luminescence, and compare it with the rare-earths properties in the same range. The characterization consists in measurements of optical absorption spectra, optical emission spectra and life-time decay. Differential thermal analysis (DTA) was also performed, to identify changes in Tg and Tx as function of the doping concentration, which is important to the drawing process of a fiber.
Dual-wavelength fiber laser based on fine adjustment of cavity loss by a fiber optical loop mirror
Author(s):
M. Durán Sánchez;
E. A. Kuzin;
B. Ibarra-Escamilla;
A. González-García;
J. L. Cruz;
M. V. Andrés;
O. Pottiez
Show Abstract
We study experimentally the behavior of a dual wavelength Erbium doped fiber laser based on superimposed fiber Bragg gratings (SI-FBGs) and a loop mirror. The linear cavity is formed by a Hi-Bi Fiber Optical Loop Mirror (HBFOLM) and a SI-FBG. Three pairs of SI-FBGs were used to tune the dual wavelength laser at different wavelength ranges. The SIFBGs were placed on a mechanical mount that allow compression, both lines are shifted simultaneously. The separation of SI-FBGs is 5nm, and the set of three SI-FBGs permit to cover almost the entire spectrum of erbium from 1529nm to 1556nm approximately. The HBFOLM is used as a spectral tunable filter, which adjusts the losses by controlling the temperature in the Hi-Bi fiber, in order to stabilize the dual wavelength emission of the laser.
All-fiber highly chirped dissipative soliton oscillator and its scaling
Author(s):
Denis S. Kharenko;
Evgenii V. Podovilov;
Alexander A. Apolonskiy;
Sergey A. Babin
Show Abstract
We report on the experimental realization of a highly-chirped dissipative soliton (DS) oscillator with all-fiber cavity consisting of a short single-mode fiber part (for mode locking via nonlinear polarization evolution) and a long PM fiber part (for generation of highly-chirped DS) that enabled to increase cavity length to L ~ 90 m. Stable DS pulses dechirped to ~ 200 fs are generated with maximum energy of ~ 20 nJ. The energy limit is shown to be defined by the onset of Raman conversion of the DS spectrum. The Stokes pulse reaching comparable energy inside the cavity and does not break the soliton stability. Higher DS energy is possible by means of a core enlargement, corresponding experiments are also performed.
1.3 μm flat-gain optical amplification with bi doped silica fiber
Author(s):
Soichi Kobayash;
Kazuya Matsuda;
Tatsuya Fujii;
Hirotaka Yamane;
Yusuke Fujii
Show Abstract
1.3 μm optical amplifiers for the long-distance up-stream networks are attractive for a future increase of fiber access network in telecommunications. In this report an optical amplification with Bi doped silica fiber (BDSF) fabricated by the vapor axial deposition (VAD) method is presented at 1300 nm.
Impact of P2 scribe geometry on monolithic series interconnected CIGS modules
Author(s):
M. Rekow;
D. Bartl;
C. Sandfort;
A. Letsch
Show Abstract
The CIGS (Copper Indium Gallium Selenide) solar panel industry is cautiously moving to adopt laser processes for the P2 and the P3 scribe steps that form the electrical interconnection between cells within a module [1]. In this work we study variants of these two laser processes and evaluate their relative performance. P2 scribes are applied with geometries that range from continuous scribes to discrete spots and we examine the relationship between scribe geometry and P2 contact resistance. Transmission line theory [2] is used to calculate P2 contact resistance as is common in the industry. The results are compared with two simple geometric models that predict relative contact resistance for different scribe geometries. We also apply different types of scribes for both P2 and P3 in the production of minimodules and evaluate the results. We find that not only is the optimal geometry for the P2 scribe a continuous line, high overlap of the laser spots yields an improvement in contact resistance not predicted by geometry alone. Finally we find that removing only the TCO (transparent conductive oxide) layer for the P3 scribe results in modules with good efficiency, however a P3 scribe that removes the TCO and CIGS layer yields better modules with about 1% higher absolute efficiency.
Picosecond supercontinuum laser with consistent emission parameters over variable repetition rates from 1 to 40 MHz
Author(s):
Thomas Schönau;
Torsten Siebert;
Romano Härtel;
Dietmar Klemme;
Kristian Lauritsen;
Rainer Erdmann
Show Abstract
An freely triggerable picosecond visible supercontinuum laser source is presented that allows for a uniform spectral
profile and equivalent pulse characteristics over variable repetition rates from 1 to 40MHz. The system features PM Yb3+-doped fiber amplification of a picosecond gain-switched seed diode at 1062 nm. The pump power in
the multi-stage amplifier is actively adjusted by a microcontroller for a consistent peak power of the amplified signal in the full range of repetition rates. The length of the PCF is scaled to deliver a homogeneous spectrum and minimized distortion of the temporal pulse shape.
Thermal effect-resilient design of large mode area double-cladding Yb-doped photonic crystal fibers
Author(s):
Enrico Coscelli;
Federica Poli;
Mette M. Jørgensen;
Thomas T. Alkeskjold;
Lasse Leick;
Jes Broeng;
Michele Sozzi;
Alessandro Candiani;
Annamaria Cucinotta;
Stefano Selleri
Show Abstract
The effects of thermally-induced refractive index change on the guiding properties of different large mode area fibers have been numerically analyzed. A simple but accurate model has been applied to obtain the refractive index change in the fiber cross-section, and a full-vector modal solver based on the finite-element method has been used to calculate the guided modes of the fibers operating at high power levels. The results demonstrate that resonant structures added to the fiber cross-section can be exploited to provide efficient suppression of high-order modes with a good resilience to thermal effects.
Chirped pulse amplification in Tm doped fiber using a chirped Bragg grating
Author(s):
Robert Andrew Sims;
Pankaj Kadwani;
Lawrence Shah;
Martin Richardson
Show Abstract
Femtosecond pulses were generated and amplified via chirped pulse amplification in Tm:fiber. The mode-locked oscillator centered at 1975 nm produced 800 fs transform limited pulses with 40 pJ energy at 60 MHz repetition rate. Subsequently, a soliton self-frequency shift in a thulium-doped fiber pumped with a 793 nm diode was used to amplify pulses to 3 nJ, shift the center wavelength, and reduce the pulse duration to 150 fs. This pulse was tuned to 2020 nm to match the center wavelength of a chirped Bragg grating. The pulses were stretched to >160 ps pulses, amplified to 85 nJ in single-mode Tm:fiber and recompressed to 400 fs.
Design and demonstration of tunable q-switched fiber laser
Author(s):
Manas Srivastava;
Deepa Venkitesh;
Balaji Srinivasan
Show Abstract
The details of the design and implementation of a narrow linewidth, wavelength-tunable and variable repetition-rate short pulse Q-switched fiber laser are discussed. A traveling wave model is used in conjunction with Finite different time domain method to account for propagation delays, spatial distribution of powers and population densities in the laser. A tunable repetition rate and tunable wavelength laser is demonstrated experimentally, yielding pulses of peak power 7.1 W, width 212 ns (at 1533 nm) and a repetition rate of 10 kHz. The paper further discusses the simulation and experimental results of the characteristic features of tunable wavelength and tunable repetition rate pulsed laser.
Microstructured cladding elements to enhance the performance of large mode area leakage channel fibers
Author(s):
Sonali Dasgupta;
John R. Hayes;
Catherine Baskiotis;
David J. Richardson
Show Abstract
Large mode area fibers are imperative for scaling up the peak and average power of fiber lasers. Single-mode behavior
and low FM loss are the crucial functionalities for these fibers. While rod-type Photonic Crystal Fibers (PCFs) have
been very successful in offering large mode areas, the typical device length requirement (~1m) and rigid configuration
limits their attractiveness for practical applications. LMA fibers offering a degree of bend tolerance are thus highly
desired. Leakage channel fibers (LCFs) have shown a great potential for offering substantial bend tolerance along with
large mode areas. However, the proposed use of Fluorine-doped rods in the all-solid version limits their practical design space. Here, we propose a novel design concept to attain single-material, large mode area fibers (mode area >~1000μm2) with effectively single mode operation coupled with bending characteristics comparable to all-solid LCFs and, at the same time, greater design flexibility and easier splicing relative to rod-type PCFs.
Robust 1550-nm single-frequency all-fiber ns-pulsed fiber amplifier for wind-turbine predictive control by wind lidar
Author(s):
F. Beier;
O. de Vries;
T. Schreiber;
R. Eberhardt;
A. Tünnermann;
C. Bollig;
P. G. Hofmeister;
J. Schmidt;
R. Reuter
Show Abstract
Scaling of the power yield of offshore wind farms relies on the capacity of the individual wind turbines. This results in a trend to very large rotor diameters, which are difficult to control. It is crucial to monitor the inhomogeneous wind field in front of the wind turbines at different distances to ensure reliable operation and a long lifetime at high output levels. In this contribution, we demonstrate an all-fiber ns-pulsed fiber amplifier based on cost-efficient commercially available components. The amplifier is a suitable source for coherent Doppler lidar pulses making a predictive control of the turbine operation feasible.
Pulsed Yb:fiber system capable of >250kW peak power with tunable pulses in the 50ps to 1.5ns range
Author(s):
Timothy S. McComb;
Tyson L. Lowder;
Vickie Leadbetter;
Mitch Reynolds;
Matthieu J. Saracco;
Joel Hutchinson;
Jared Green;
Dennis McCal;
Gary Burkholder;
Tim Kutscha;
Adam Dittli;
Chuck Hamilton;
Dahv A. V. Kliner;
Matthew Randall;
Geoff Fanning;
Jake Bell
Show Abstract
We have demonstrated a pulsed 1064 nm PM Yb:fiber laser system incorporating a seed source with a tunable pulse repetition rate and pulse duration and a multistage fiber amplifier, ending in a large core (>650 μm2 mode field area), tapered fiber amplifier. The amplifier chain is all-fiber, with the exception of the final amplifier’s pump combiner, allowing robust, compact packaging. The air-cooled laser system is rated for >60 W of average power and beam quality of M2 < 1.3 at repetition rates below 100 kHz to 10’s of MHz, with pulses discretely tunable over a range spanning 50 ps to greater than 1.5 ns. Maximum pulse energies, limited by the onset of self phase modulation and stimulated Raman scattering, are greater than 12.5 μJ at 50 ps and 375 μJ at 1.5 ns , corresponding to >250 kW peak power across the pulse tuning range. We present frequency conversion to 532 nm with efficiency greater than 70% and conversion to UV via frequency tripling, with initial feasibility experiments showing >30% UV conversion efficiency. Application results of the laser in scribing, thin film removal and micro-machining will be discussed.
Compact, 17W average power, 100kW peak power, nanosecond fiber laser system
Author(s):
Matthieu J. Saracco;
David Logan;
Jared Green;
David Balsley;
Mike Nelson;
Jay Small;
Scott Mettlen;
Tyson L. Lowder;
Timothy S. McComb;
Tim Kutscha;
Gary Burkholder;
Michael R. Smith;
Dahv A. V. Kliner;
Matthew Randall;
Geoff Fanning;
Jake Bell
Show Abstract
We demonstrate a robust, compact, low-cost, pulsed, linearly polarized, 1064 nm, Yb:fiber laser system capable of generating ~100 kW peak power pulses and >17 W average power at repetition rates of 80 – 285 kHz. The system employs a configurable microchip seed laser that provides nanosecond (~1.0 – 1.5 ns) pulse durations. The seed pulses are amplified in an all-fiber, polarization maintaining, large mode area (LMA) fiber amplifier optimized for high peak power operation. The LMA Yb:fiber amplifier enables near diffraction limited beam quality at 100 kW peak power. The seed laser, fiber amplifier, and beam delivery optics are packaged into an air-cooled laser head of 152×330×87 mm3 with pump power provided from a separate air-cooled laser controller. Due to the high peak power, high beam quality, spectral purity, and linearly polarized nature of the output beam, the laser is readily frequency doubled to 532 nm. Average 532 nm powers up to 7 W and peak powers exceeding 40 kW have been demonstrated. Potential for scaling to higher peak and average powers in both the green and infrared (IR) will be discussed. This laser system has been field tested and demonstrated in numerous materials processing applications in both the IR and green, including scribing and marking. We discuss recent results that demonstrate success in processing a diverse array of representative industrial samples.
On the SBS threshold of optical pulse shapes compensated for gain saturation
Author(s):
Louis Desbiens;
Vincent Roy;
Marc Deladurantaye;
Yves Taillon
Show Abstract
Nanosecond pulsed fiber laser sources have found multiple usages in material processing applications. Their reliability,
flexibility, low cost, high average power and high beam quality are the reasons for their commercial success. With
appropriate means, nanosecond fiber lasers based on a MOPA configuration can emit pulses with tailored shapes. This
feature greatly increases the flexibility of the laser as it allows the emission of pulses of adjustable duration, complex
pulse shapes such as bursts of short pulses, gain saturation-compensated shapes, chair-like shapes, or any other
variations. Pulse shaping can have a significant impact on the ablation rate, the surface quality of the processed sample and different materials have been shown to respond differently to those pulse shape variations (the thermal conductivity of the material being a key parameter). Pulse shaping is also very valuable for optimizing the pulse energy from a system as it allows pre-compensation for the pulse distortion caused by gain saturation which tends to narrow the pulse duration, increase the peak power and associated SRS sensitivity. Through pulse shaping, one can achieve pulse energies that are significantly higher than the saturation energy of the amplifier while mitigating the detrimental effects of SRS. It is however important to consider the impact of pulse shape and pulse duration on the SBS threshold of an optical system. We have performed numerous SBS threshold measurements for pulses of varying duration and of varying levels of precompensation for gain saturation. We have demonstrated that pulse shapes with effective pulse duration of 40 ns have the lowest SBS threshold.
Polarization dependent nonlinear limitations in continuous-wave high power fiber amplifiers
Author(s):
N. Haarlammert;
M. Rekas;
O. de Vries;
A. Kliner;
A. Liem;
T. Schreiber;
R. Eberhardt;
A. Tünnermann
Show Abstract
We investigate the influence of seed polarization on nonlinear effects in a high power fiber amplifier for different orientations of the linear seed polarization and for different ellipticities of the seed polarization (linear, elliptic, circular polarized). We show that it was possible to considerably reduce the power of the Raman scattered light. Maximum reduction to around 50% could be achieved by changing the seed polarization from linear to circular. Furthermore, we demonstrate that not only the threshold of nonlinear effects could be influenced by changing the orientation of the linear seed polarization as only parameter but even the limiting effect could be changed: For all orientations of the linear seed polarization Raman scattering was the dominant nonlinear effect except for linear polarization along the slow fiber axis of the slightly birefringent amplifier fiber, where also modulation instability was observed. From our results we estimate the importance of the polarization state as further parameter to increase the nonlinear threshold of high power fiber amplifier systems.
Novel Y2O3-codoped Yb/Tm-doped picosecond fiber laser
Author(s):
Vladislav V. Dvoyrin;
Dmitry Klimentov;
Arindam Halder;
Mukul C. Paul;
Mrinmay Pal;
Shyamal K. Bhadra;
Alexander V. Kir'yanov;
Irina T. Sorokina
Show Abstract
We demonstrate the novel picosecond mode-locked Y2O3-codoped Yb/Tm-doped fiber lasers, operating at 1950 nm and producing pulses of up to 1 nJ energy, using a SESAM and an Er-doped pump fiber laser operating at the wavelength 1590 nm or a semiconductor pump laser operating at the wavelength of 1560 nm. We also report on the spectroscopic characterization of these new fibers with various compositions, identifying the optimum one for the maximum Yb/Tm energy transfer, the latter increasing with the increase of the Y concentration. The observed energy transfer between Yb and Tm makes this laser promising also for direct diode-pumping with most advanced and low cost 975 nm diodes, making this laser attractive for compact low cost picosecond Tm-doped fiber laser systems.
Peak power scaling in Tm doped fiber lasers to MW-level
Author(s):
Christian Gaida;
Martin Gebhardt;
Pankaj Kadwani;
Lasse Leick;
Jes Broeng;
Lawrence Shah;
Martin Richardson
Show Abstract
In this manuscript we present our recent achievements utilizing thulium-doped photonic crystal fiber rods (PCF-rods) for lasing at 2 μm wavelength and their potential as high peak power amplifiers. Two PCF-rods with 65 μm and 80 μm core diameter were first separately characterized in CW laser oscillators. The rods were pumped with a 793 nm laser diode and produced more than 18 W output power with near diffraction limited beam quality and a slope efficiency of up to 27.8 %. Implementing an intracavity high reflectivity grating for lasing wavelength selection enabled a tuning range of 180 nm from 1810 nm to 1990 nm. Thereafter the PCF-rod with 80 μm core was used as an amplifier and produced similar output powers when seeded with up to 4 W at 1960 nm from a master oscillator power amplifier (MOPA). The slope efficiency in this case was reduced to 20.1 % mainly due to the center wavelength of 1960nm. We are in the process of characterizing these rods in a pulsed amplification configuration to surpass MW-level peak power with multi-mJ pulse energy.
Crystal fibers for high power lasers
Author(s):
W. Kim;
C. Florea;
D. Gibson;
J. Peele;
C. Askins;
B. Shaw;
S. Bowman;
S. O'Connor;
S. Bayya;
I. Aggarwal;
J. S. Sanghera
Show Abstract
In this paper, we present our recent progress in developing single crystal fibers for high power single frequency fiber
lasers. The optical, spectral and morphological properties as well as the loss and gain measured from these crystal fibers drawn by Laser Heated Pedestal Growth (LHPG) system are also discussed. Results on application of various cladding materials on the crystal core and the methods of fiber end-face polishing are also presented.
Cascade scheme of FM pulse amplification in length-inhomogeneous active waveguides with normal dispersion
Author(s):
Ch. Borisova;
I. Zolotovskii;
D. Korobko;
D. Sementsov;
A. Sysoliatin;
M. Yavtushenko
Show Abstract
We propose a new all-fiber cascade picosecond pulse amplification scheme based on optical fibers with varying normal group velocity dispersion (GVD). Amplification is performed in the fiber sections with exponential growth of the normal dispersion. Amplification sections are altered by the sections of passive fibers with the decreasing normal GVD. The pulse chirp in dispersion decreasing fibers can be adjusted by the increment of dispersion variation which would allow to control the spectral bandwidth of the pulse to keep it within an amplification band.
Multi-kW cw fiber oscillator pumped by wavelength stabilized fiber coupled diode lasers
Author(s):
Frank Becker;
Benjamin Neumann;
Lutz Winkelmann;
Steffen Belke;
Stefan Ruppik;
Ulrich Hefter;
Bernd Köhler;
Paul Wolf;
Jens Biesenbach
Show Abstract
High power Yb doped fiber laser sources are beside CO2- and disk lasers one of the working horses of industrial laser
applications. Due to their inherently given robustness, scalability and high efficiency, fiber laser sources are best suited to fulfill the requirements of modern industrial laser applications in terms of power and beam quality. Pumping Yb doped single-mode fiber lasers at 976nm is very efficient. Thus, high power levels can be realized avoiding limiting nonlinear effects like SRS. However the absorption band of Yb doped glass around 976nm is very narrow. Therefore, one has to consider the wavelength shift of the diode lasers used for pumping. The output spectrum of passively cooled diode lasers is mainly defined by the applied current and by the heat sink temperature. Furthermore the overall emission line width of a high power pump source is dominated by the large number of needed diode laser emitters, each producing an individual spectrum. Even though it is possible to operate multi-kW cw single-mode fiber lasers with free running diode laser pumps, wavelength stabilizing techniques for diode lasers (e.g. volume holographic gratings, VHG) can be utilized in future fiber laser sources to increase the output power level while keeping the energy consumption constant. To clarify the benefits of wavelength stabilized diode lasers with integrated VHG for wavelength locking the performance of a dual side pumped fiber oscillator is discussed in this article. For comparison, different pumping configurations consisting of stabilized and free-running diode lasers are presented.
Pulsed thulium doped fiber laser at 1.94 µm based on a seed diode
Author(s):
Enkeleda Balliu;
Massimo Olivero;
Andrea Braglia;
Alessio Califano;
Guido Perrone
Show Abstract
A fiber laser operating at 1.94μm in pulsed regime has been developed in a MOPA configuration. The seed consists of a custom-developed board hosting a laser diode, whose current is modulated to achieve the desired pulse shape, duration and repetition rate. The pulses are amplified through a thulium-doped fiber amplifier pumped at 793 nm. The design of the amplifier stage has been performed by dynamic simulation of a rate-equations model and compared to the experimental measurements. Simulations and experimental measurements have exhibited comparable results, devising the realization of an effective pulsed laser system whose parameters can be easily tuned through the seed.
Passively stabilized Brillouin fiber lasers with doubly resonant cavities
Author(s):
Vasily V. Spirin;
Cesar A. López-Mercado;
Damien Kinet;
Patrice Mégret;
Igor O. Zolotovskiy;
Andrei A. Fotiadi
Show Abstract
We report two completely passive solutions enabling perfect stabilization of the Brillouin lasers with doubly-resonant cavities. The first laser configuration was stabilized through self-injection locking mechanism implemented to the laser cavity with DFB semiconductor pump laser. Second configuration included a nonlinear fiber mirror based on the population inversion dynamical gratings induced in low-absorbed Er-doped fiber. In both cases, the operating wavelength of the pump laser occurred to be locked to the ring resonance frequency leading to effective generation of Brillouin Stokes radiation. The pump-to-Stokes conversion efficiency of ~40% and the Stokes linewidth of <500Hz have been successfully demonstrated with both laser configurations.
Synchronized ps fiber lasers with pulse durations (25, 50, 100-2000ps) and repetition rates (100kHz-150Mhz) continuously tunable over three orders of magnitude
Author(s):
Alexandre Dupuis;
Bryan Burgoyne;
Guido Pena;
André Archambault;
Dominic Lemieux;
Vasile Solomonean;
Maxime Duong;
Alain Villeneuve
Show Abstract
Ultrafast lasers are enabling precision machining of a wide variety of materials. However, the optimal laser parameters for proper material processing can differ greatly from one material to another. In order to cut high aspect-ratio features at high processing speeds the laser parameters such as pulse energy, repetition rate, and cutting speed need to be optimized. In particular, a shorter pulse duration plays an important role in reducing the thermal damage in the Heat-Affected Zones. In this paper we present a novel ps fiber laser whose electronically tunable parameters aim to facilitate the search for optimal processing parameters. The 20W 1064nm Yb fiber laser is based on a Master Oscillator Power Amplifier (MOPA) architecture with a repetition rate that can be tuned continuously from 120kHz to 120MHz. More importantly, the integration of three different pulse generators enables the pulse duration to be switched from 25ps to 50ps, or to any value within the 55ps to 2000ps range. By reducing the pulse duration from the ns-regime down to 25ps, the laser approaches the transition from the thermal processing regime to the ablation regime of most materials. Moreover, in this paper we demonstrate the synchronization of the pulses from two such MOPA lasers. This enables more elaborate multipulse processing schemes where the pulses of each laser can be set to different parameter values, such as an initial etching pulse followed by a thermal annealing pulse. It should be noted that all the laser parameters are controlled electronically with no moving parts, including the synchronization.
156 micro-J ultrafast Thulium-doped fiber laser
Author(s):
Peng Wan;
Lih-Mei Yang;
Jian Liu
Show Abstract
A high energy, high power ultrafast Tm doped fiber laser system was successfully developed. Pulse energy of 156 μJ and average power of 15.6 W were achieved. The laser system consisted of a mode-locked 2020 nm seed oscillator and multiple-stage power amplifiers. The seed included 30 m-long dispersion compensating fiber and emitted slightly chirped pulses with spectrum bandwidth of 8 nm. The mode-locking was stable and self-started. Repetition rate of seed oscillator was 2.5 MHz. The seed pulses were stretched with anomalous dispersion fiber to the duration of 320 ps. An AOM was used as a pulse picker to lower the repetition rate. A two-stage pre-amplifier was used to boost the pulse energy to 3 μJ. Pulse energies of up to 156 μJ were obtained from the final stage of power amplifier at a repetition rate of 100 kHz. Pulse durations of 780 fs were obtained after pulse compression. High OSNR and low background noise were also achieved at this low repetition rate.
High-efficiency (6+1)x1 combiner for high power fiber lasers and amplifiers
Author(s):
Dan Neugroschl;
Jongchul Park;
Mitchell Wlodawski;
Jonathan Singer;
Victor I. Kopp
Show Abstract
We have developed a (6+1)x1 combiner for fiber lasers and amplifiers based on a glass fusion technology. We have
combined a conventional fiber fusion technology for pump channels with a new design for a single mode signal
channel, which utilizes a vanishing core technology. The approach has been developed for single channel spot size
converters and pitch reducing optical fiber arrays (PROFAs). Flexibility of this technology allows a custom design
to match both a single or large mode area fiber at the input and a required active fiber at the output. The technology
allows two parameters, mode field diameter (MFD) and taper diameter or channel spacing to be adjusted independently resulting in low loss coupling for signal channel at input and output. Utilizing this approach we have
obtained better than 0.3 dB coupling for a signal channel at 1550 nm with a standard SMF28 fiber at the input and
an active fiber at the output, while using six conventional 105/125 micron fibers as pump channels operating at 974
nm efficiently coupled to a double-clad fiber. Low signal loss results in high efficiency lasing or amplification suitable for high power applications. This unique technology allows excellent coupling for the signal channel as well as for the pump channels and is amenable to even more pump channels if desired.
Forced air cooling of volume Bragg gratings for spectral beam combination
Author(s):
Brian Anderson;
Sergiy Kaim;
George Venus;
Julien Lumeau;
Vadim Smirnov;
Boris Zeldovich;
Leonid Glebov
Show Abstract
Volume Bragg gratings have been successfully used in spectral beam combining of high power fiber lasers with narrow channel separation and in four channel passive coherent beam combining of fiber lasers. Future application of beam combining with kilowatt level lasers requires a more detailed understanding of how to cool the gratings without hurting beam quality. Forced air cooling blown across both surfaces of the grating is both easy and cheap, but has been avoided in the past due to concerns of how the air density fluctuations will hurt beam quality. It is now shown that forced air cooling has no adverse effect on the M2 parameter due to density fluctuations in the air, and can efficiently cool VBG’s such that no degradation in beam quality is seen due to thermal distortions.
Numerical studies of modal instabilities in high-power fiber amplifiers
Author(s):
Shadi Naderi;
Iyad Dajani;
Timothy Madden;
Bemjamin Ward;
Craig Robin;
Jake Grosek
Show Abstract
We present a detailed time-dependent numerical model of the modal instability phenomenon observed in Yb-doped fiber amplifiers. The thermal effects are captured by solving the heat equation in polar coordinate using a 2D, second-order, time-dependent, alternating direction implicit (ADI) method. The model captures the three power-dependent regions that are characteristic of the transfer of energy between the fundamental mode and the higherorder mode as a function of time. It is also shown that for the fiber configuration investigated, the modal instability threshold scales linearly over a wide range with the seed power. Furthermore, we present numerical results indicating that gain tailoring can increase the threshold. Two different gain-tailored fiber designs are simulated and compared.