Nonlinear beam control via amplitude and phase locking in multimode GRIN fibers

Fabio Mangini; Mario Ferraro; Yifan Sun; Pedro Parra-Rivas; Mikhail Gervaziev; Denis Kharenko; Vincent Couderc; Stefan Wabnitz

doi:10.1117/12.3007886

12 March 2024 Nonlinear beam control via amplitude and phase locking in multimode GRIN fibers

Fabio Mangini, Mario Ferraro, Yifan Sun, Pedro Parra-Rivas, Mikhail Gervaziev, Denis Kharenko, Vincent Couderc, Stefan Wabnitz

Author Affiliations +

Proceedings Volume 12871, Laser Resonators, Microresonators, and Beam Control XXVI; 128710E (2024) https://doi.org/10.1117/12.3007886
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

Spatial beam self-cleaning in graded-index multimode fibers involves a nonlinear transfer of power among the fiber modes, which leads to robust bell-shaped output beams. The resulting output mode power distribution can be described by statistical mechanics arguments. Although the spatial coherence of the output beam was experimentally demonstrated, there is no direct study of modal phase evolution. Based on a holographic mode decomposition method, we reveal that nonlinear spatial phase-locking occurs between the fundamental and its neighboring low-order modes, in good quantitative agreement with theoretical predictions.

Conference Presentation

Citation Download Citation

Fabio Mangini, Mario Ferraro, Yifan Sun, Pedro Parra-Rivas, Mikhail Gervaziev, Denis Kharenko, Vincent Couderc, and Stefan Wabnitz "Nonlinear beam control via amplitude and phase locking in multimode GRIN fibers", Proc. SPIE 12871, Laser Resonators, Microresonators, and Beam Control XXVI, 128710E (12 March 2024); https://doi.org/10.1117/12.3007886

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