High-power/energy large mode area tapered fiber amplifiers

V. Roy; P. Grenier; L. Desbiens; S. Deshaies; M. Deladurantaye; P. Paradis; M. Boivin; B. Labranche; A. Proulx; Y. Taillon

doi:10.1117/12.2584194

5 March 2021 High-power/energy large mode area tapered fiber amplifiers

V. Roy, P. Grenier, L. Desbiens, S. Deshaies, M. Deladurantaye, P. Paradis, M. Boivin, B. Labranche, A. Proulx, Y. Taillon

Author Affiliations +

Proceedings Volume 11665, Fiber Lasers XVIII: Technology and Systems; 1166509 (2021) https://doi.org/10.1117/12.2584194
Event: SPIE LASE, 2021, Online Only

Abstract

A short-pulse Yb-doped fiber laser based on a master oscillator and power amplifier scheme is reported to yield an average power exceeding 500 W and pulse energy over 1 mJ. The final amplifier stage features a polarization-maintaining, large mode area tapered fiber with core/cladding diameters of 35/250 μm and 56/400 μm at each end of the flared section. The latter yields excellent optical conversion efficiency, near diffraction-limited output, narrow spectral linewidth and high polarization extinction ratio. The threshold for the onset of stimulated Raman scattering was further investigated using a pulsed seeder with ps-ns digitally programmable waveforms. Besides, no indication for transverse mode instability could be observed below the stimulated Raman scattering threshold, as beam quality M² was measured < 1.3 and no fluctuations were further detected from photodiode time-traces of near-field laser beam samples.

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V. Roy, P. Grenier, L. Desbiens, S. Deshaies, M. Deladurantaye, P. Paradis, M. Boivin, B. Labranche, A. Proulx, and Y. Taillon "High-power/energy large mode area tapered fiber amplifiers", Proc. SPIE 11665, Fiber Lasers XVIII: Technology and Systems, 1166509 (5 March 2021); https://doi.org/10.1117/12.2584194

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