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We report experimental results, showing that the Kerr beam self-cleaning ofmany low-order modes in a graded-index multimode fiber can be controlled thanksto optimized wavefront shaping of the coherent excitation beam. Adaptiveprofiling of the transverse input phase was utilized for channeling thelaunched power towards a specific low-order fiber mode, by exploiting nonlinearcoupling among all guided modes. Experiments were carried out with 7 ps pulsesat 1064 nm injected in a five meters long multimode fiber operating in thenormal dispersion regime. Optimized Kerr beam self-cleaning of five differentLP modes is reported, with a power threshold that increases with the modeorder.

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