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Spatial beam self-cleaning: From non-equilibrium to thermalization of nonlinear multimode fiber modes

par Mangini, Fabio;Ferraro, Mario;Gemechu, Wasyhun Asefa;Sun, Yifan ;Gervaziev, Mikhail;Kharenko, Denis;Babin, Sergey;Couderc, Vincent;Wabnitz, Stefan
Référence Proceedings of SPIE - The International Society for Optical Engineering, 13349, 133490B
Publication Publié, 2025-01-01

Article révisé par les pairs

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Résumé :

We present a direct experimental demonstration that spatial beam self-cleaning in nonlinear multimode graded-index optical fibers arises from the nonequilibrium evolution of the mode population toward a state of thermal equilibrium. This process is shown to be a result of the maximization of the optical entropy of the modal distribution. Entropy maximization is observed both when the input beam power is increased with a fixed length of fiber, and when the fiber length grows larger while keeping the input beam power constant.