Wave thermalization sets high-power limitation to spatial beam self-cleaning in multimode optical fibers

Fabio Mangini; Mario Ferraro; Alessandro Tonello; Vincent Couderc; Stefan Wabnitz

doi:10.1117/12.3007907

12 March 2024 Wave thermalization sets high-power limitation to spatial beam self-cleaning in multimode optical fibers

Fabio Mangini, Mario Ferraro, Alessandro Tonello, Vincent Couderc, Stefan Wabnitz

Proceedings Volume 12871, Laser Resonators, Microresonators, and Beam Control XXVI; 128710H (2024) https://doi.org/10.1117/12.3007907
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

We experimentally reveal a so-far unnoticed high-power limit to spatial beam self-cleaning in graded-index nonlinear multimode optical fibers. As the optical pulse power is progressively increased, we observed that the initial Kerr-induced beam clean-up and associated improvement of the spatial beam quality are eventually spoiled. Based on a holographic mode decomposition of the output field, we show that this beam degradation can be described in a thermodynamic approach to wave propagation as a manifestation of “high-temperature” thermalization, which depletes the fundamental mode in favor of a highly multimodal power distribution.

Conference Presentation

Citation Download Citation

Fabio Mangini, Mario Ferraro, Alessandro Tonello, Vincent Couderc, and Stefan Wabnitz "Wave thermalization sets high-power limitation to spatial beam self-cleaning in multimode optical fibers", Proc. SPIE 12871, Laser Resonators, Microresonators, and Beam Control XXVI, 128710H (12 March 2024); https://doi.org/10.1117/12.3007907

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