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

作者：Guenard R; Krupa K; Dupiol R; Fabert M; Bendahmane A; Kermene V; Desfarges Berthelemot A; Auguste J L; Tonello A; Barthelemy A; Millot G; Wabnitz S; Couderc V^*

来源：Optics Express, 2017, 25(19): 22219-22227.

DOI：10.1364/OE.25.022219

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.

• 出版日期2017-9-18