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Optical Engineering

Discretely tunable thulium-doped fiber-based polarization-maintaining master oscillator power amplifier using fiber Bragg grating arrays as spectral filters
Author(s): Tobias Tiess; Saher Junaid; Martin Becker; Manfred Rothhardt; Hartmut Bartelt; Matthias L. Jäger
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Paper Abstract

Thulium (Tm)-doped fiber lasers offer a broad emission bandwidth in the 2-μm region, providing the perfect basis to develop broadly tunable laser sources, e.g., for spectroscopic applications. Recently, a tuning principle for pulsed fiber lasers has been reported, which is based on a fiber Bragg grating (FBG) array as a discrete spectral filter. This concept uniquely combines an unrivaled spectral freedom for tailored tuning ranges with a monolithic layout preserving the inherent advantages of fiber-integrated systems. In this study, we investigate this discrete tuning method using a Tm-doped fiber laser in the spectral domain around 1950 nm. While the laser emits linearly polarized light based on a polarization-maintaining (PM) resonator, we also examine the possibility of using standard FBG arrays inscribed in non-PM fiber. In order to highlight the prospect for tunable high-power operation, the tunable seed laser is implemented in a master oscillator power amplifier configuration scaling the average power to ∼28  W. With a tuning range of up to 76 nm, the emission characteristics of the system are investigated showing pulse durations down to 11 ns and a very good spectral signal contrast with narrow linewidth.

Paper Details

Date Published: 13 June 2016
PDF: 7 pages
Opt. Eng. 55(6) 064106 doi: 10.1117/1.OE.55.6.064106
Published in: Optical Engineering Volume 55, Issue 6
Show Author Affiliations
Tobias Tiess, Leibniz-Institut für Photonische Technologien e.V. (Germany)
Saher Junaid, Leibniz-Institut für Photonische Technologien e.V. (Germany)
Martin Becker, Leibniz-Institut für Photonische Technologien e.V. (Germany)
Manfred Rothhardt, Leibniz-Institut für Photonische Technologien e.V. (Germany)
Hartmut Bartelt, Leibniz-Institut für Photonische Technologien e.V. (Germany)
Friedrich-Schiller-Univ. Jena (Germany)
Matthias L. Jäger, Leibniz-Institut für Photonische Technologien e.V. (Germany)

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