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9 March 2023 Transverse mode instability suppression using wavefront shaping in multimode fiber amplifiers
Kabish Wisal, Chun-Wei Chen, Hui Cao, A. Douglas Stone
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Proceedings Volume 12400, Fiber Lasers XX: Technology and Systems; 124000P (2023) https://doi.org/10.1117/12.2649461
Event: SPIE LASE, 2023, San Francisco, California, United States
Abstract
Transverse Mode Instability (TMI) is one of several nonlinear effects that limit power scaling in high power fiber lasers and amplifiers. We demonstrate that TMI can be effectively suppressed by spreading power in multiple modes of the fiber. We show that the TMI threshold scales linearly with the number of modes, upon equal excitation of modes, caused by smearing of thermally induced refractive index grating. The multimode excitation can be focused to a diffraction limited spot, giving high quality beam with increased TMI threshold. We finally show linear scaling of TMI threshold is maintained upon inclusion of gain saturation.
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Kabish Wisal, Chun-Wei Chen, Hui Cao, and A. Douglas Stone "Transverse mode instability suppression using wavefront shaping in multimode fiber amplifiers", Proc. SPIE 12400, Fiber Lasers XX: Technology and Systems, 124000P (9 March 2023); https://doi.org/10.1117/12.2649461
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KEYWORDS
Amplifiers
Multimode fibers
Wavefronts
Thermal optics
Diffraction gratings
High power fiber lasers
Laser scattering
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