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.
Wave thermalization sets high-power limitation to spatial beam self-cleaning in multimode optical fibers / Mangini, Fabio; Ferraro, Mario; Tonello, Alessandro; Couderc, Vincent; Wabnitz, Stefan. - 12871:(2024), pp. 1-7. (Intervento presentato al convegno SPIE Photonics West 2024 tenutosi a San Francisco, USA) [10.1117/12.3007907].
Wave thermalization sets high-power limitation to spatial beam self-cleaning in multimode optical fibers
Mangini, Fabio;Ferraro, Mario;Couderc, Vincent;Wabnitz, Stefan
2024
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.File | Dimensione | Formato | |
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