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 selfcleaning 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.
Nonlinear beam self-cleaning in a coupled cavity composite laser based on multimode fiber / Guenard, R., Krupa, K., Dupiol, R., Fabert, M., Bendahmane, A., Kermene, V., Desfarges Berthelemot, A., Auguste, J.L., Tonello, A., Barthélémy, A., Millot, G., Wabnitz, S., Couderc, V.. - In: OPTICS EXPRESS. - ISSN 1094-4087. - 25:19(2017), pp. 22219-22227. [10.1364/OE.25.022219]
Nonlinear beam self-cleaning in a coupled cavity composite laser based on multimode fiber
WABNITZ, Stefan;
2017
Abstract
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 selfcleaning 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.| File | Dimensione | Formato | |
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