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Nonlinear beam self-cleaning in a coupled cavity composite laser based on multimode fiber

2017; Optica Publishing Group; Volume: 25; Issue: 19 Linguagem: Inglês

10.1364/oe.25.022219

1094-4087

R. Guenard, Katarzyna Krupa, R. Dupiol, Marc Fabert, A. Bendahmane, Vincent Kermène, Agnès Desfarges‐Berthelemot, Jean‐Louis Auguste, Alessandro Tonello, Alain Barthélémy, G. Millot, S. Wabnitz, Vincent Couderc,

Optical Network Technologies

We study a coupled cavity laser configuration where a passively Q-switched Nd:YAG microchip laser is combined with an extended cavity, including a doped multimode fiber. For appropriate coupling levels with the extended cavity, we observed that beam self-cleaning was induced in the multimode fiber thanks to nonlinear modal coupling, leading to a quasi-single mode laser output. In the regime of beam self-cleaning, laser pulse duration was reduced from 525 to 225 ps. We also observed a Q-switched mode-locked operation, where spatial self-cleaning was accompanied by far-detuned nonlinear frequency conversion in the active multimode fiber.