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Proceedings Paper

High-repetition rate mode-locked ytterbium fiber laser using dichroic fiber mirrors and photonic bandgap fiber technology
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Paper Abstract

We demonstrate here an all-fiber passively mode-locked laser using an integrated fiber-end mirror and photonic band-gap fiber-based dispersion compensator. The refined technology of thin-film coatings made with electron beam evaporation on a single-mode fiber facet results in a compact dichroic pump combiner/output coupler. The dichroic mirror made of ZrO2 and SiO2 provides a low reflectivity (0.4 %) for the 980 nm pump and over 40 % reflectivity for the 1040 nm signal wavelength, which enabled us to build a short-length mode-locked ytterbium fiber laser. The laser cavity consisted of 8 cm of highly doped ytterbium fiber, 10 cm of anomalous dispersion photonic bandgap fiber, a semiconductor saturable absorber mirror (SESAM) and the dichroic mirror. Pump and signal wavelengths were separated by a fiber coupler placed outside the cavity contrary to conventional geometry. A butt-coupled SESAM provided reliable self-starting at a pump power of 150 mW. The all-fiber design using dichroic fiber mirror combined with photonic bandgap fiber dispersion compensator is highly stable and requires virtually no alignment. The mode-locked laser produces 572-fs soliton pulses at 571.03 MHz fundamental repetition rate. To the best of our knowledge, this is the highest fundamental repetition rate fiber laser operating around 1 μm reported to date.

Paper Details

Date Published: 25 February 2008
PDF: 8 pages
Proc. SPIE 6873, Fiber Lasers V: Technology, Systems, and Applications, 68731N (25 February 2008); doi: 10.1117/12.775198
Show Author Affiliations
Lasse Orsila, Tampere Univ. of Technology (Finland)
Robert Herda, Tampere Univ. of Technology (Finland)
Oleg G. Okhotnikov, Tampere Univ. of Technology (Finland)

Published in SPIE Proceedings Vol. 6873:
Fiber Lasers V: Technology, Systems, and Applications
Jes Broeng; Clifford Headley, Editor(s)

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