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Wavefront shaping for optimized many-mode Kerr beam self-cleaning in graded-index multimode fiber

2019; Optica Publishing Group; Volume: 27; Issue: 12 Linguagem: Inglês

10.1364/oe.27.017311

1094-4087

Etienne Deliancourt, Marc Fabert, Alessandro Tonello, Katarzyna Krupa, Agnès Desfarges‐Berthelemot, Vincent Kermène, G. Millot, Alain Barthélémy, S. Wabnitz, Vincent Couderc,

Photonic Crystal and Fiber Optics

We report experimental results, showing that the Kerr beam self-cleaning of many low-order modes in a graded-index multimode fiber can be controlled thanks to optimized wavefront shaping of the coherent excitation beam. Adaptive profiling of the transverse input phase was utilized for channeling the launched power towards a specific low-order fiber mode, by exploiting nonlinear coupling among all guided modes. Experiments were carried out with 7 ps pulses at 1064 nm injected in a five meters long multimode fiber operating in the normal dispersion regime. Optimized Kerr beam self-cleaning of five different LP modes is reported, with a power threshold that increases with the mode order.