Spatial beam nonlinear control with multimode GRIN fiber amplifiers

A. Niang; M. A. Jima; D. Modotto; F. Mangini; A. Tonello; U. Minoni; M. Fabert; M. Zitelli; V. Couderc; S. Wabnitz

doi:10.1117/12.2578927

5 March 2021 Spatial beam nonlinear control with multimode GRIN fiber amplifiers

A. Niang, M. A. Jima, D. Modotto, F. Mangini, A. Tonello, U. Minoni, M. Fabert, M. Zitelli, V. Couderc, S. Wabnitz

Proceedings Volume 11665, Fiber Lasers XVIII: Technology and Systems; 116650L (2021) https://doi.org/10.1117/12.2578927
Event: SPIE LASE, 2021, Online Only

Abstract

We analyzed the nonlinear dynamics of pulsed beam self-cleaning in nonlinear tapered Ytterbium doped and Erbium-Ytterbium codoped graded-index multimode optical fibers, with quasi-uniform doping distribution in the core cross-section. By increasing the net gain when operating in active configuration we observed that the output spatial intensity distribution changed from a speckled into a high-quality and bell-shaped beam. By launching pulses in the normal dispersion regime of the taper, from the wider into the smaller core diameter, we generated a supercontinuum emission between 520 nm and 2600 nm. When the laser pulses were launched into the small core side of the tapered fiber or in the Erbium-Ytterbium fiber, self-cleaning was obtained without any self-phase modulation-induced spectral broadening or frequency conversion.

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Citation Download Citation

A. Niang, M. A. Jima, D. Modotto, F. Mangini, A. Tonello, U. Minoni, M. Fabert, M. Zitelli, V. Couderc, and S. Wabnitz "Spatial beam nonlinear control with multimode GRIN fiber amplifiers", Proc. SPIE 11665, Fiber Lasers XVIII: Technology and Systems, 116650L (5 March 2021); https://doi.org/10.1117/12.2578927

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