Mitigating stimulated Brillouin scattering in single-frequency multimode fiber amplifier with diffraction-limited output

Chun-Wei Chen; Peyman Ahmadi; Kabish Wisal; Stefan Rothe; A. Douglas Stone; Hui Cao

doi:10.1117/12.3001018

13 May 2024 Mitigating stimulated Brillouin scattering in single-frequency multimode fiber amplifier with diffraction-limited output

Chun-Wei Chen, Peyman Ahmadi, Kabish Wisal, Stefan Rothe, A. Douglas Stone, Hui Cao

Author Affiliations +

Proceedings Volume PC12865, Fiber Lasers XXI: Technology and Systems; PC128650D (2024) https://doi.org/10.1117/12.3001018
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

We experimentally demonstrate a single-frequency Yb-doped multimode fiber amplifier (~76 modes) with a focused Gaussian output beam and enhanced stimulated-Brillouin-scattering (SBS) threshold. With few-mode excitation, the SBS threshold output power (57 W) is already an order of magnitude higher than that for a single-mode fiber amplifier of the same length. The output beam, however, is slightly speckled. To achieve high beam quality, we optimize the input wavefront to focus output light to a single diffraction-limited spot and simultaneously achieve much higher SBS threshold (up to 105 W), because forming a tight output focus requires coherent amplification of many modes.

Conference Presentation

Citation Download Citation

Chun-Wei Chen, Peyman Ahmadi, Kabish Wisal, Stefan Rothe, A. Douglas Stone, and Hui Cao "Mitigating stimulated Brillouin scattering in single-frequency multimode fiber amplifier with diffraction-limited output", Proc. SPIE PC12865, Fiber Lasers XXI: Technology and Systems, PC128650D (13 May 2024); https://doi.org/10.1117/12.3001018

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