Low-threshold mode instability in few-mode Yb3+-doped fiber amplifiers: an overview of recent results

Oleg Antipov; Maxim Kuznetsov; Valentin Tyrtyshnyy; Dmitry Alekseev

doi:10.1117/12.2588431

5 March 2021 Low-threshold mode instability in few-mode Yb³⁺-doped fiber amplifiers: an overview of recent results

Oleg Antipov, Maxim Kuznetsov, Valentin Tyrtyshnyy, Dmitry Alekseev

Proceedings Volume 11665, Fiber Lasers XVIII: Technology and Systems; 116650T (2021) https://doi.org/10.1117/12.2588431
Event: SPIE LASE, 2021, Online Only

Abstract

We present an overview of theoretical analysis and experimental observation of the spatio-temporal transverse mode instability in polarization-maintaining high-gain fiber amplifiers with a high concentration of Yb³⁺ ions and core diameters of 8-10 μm. The nonlinear power transformation of the LP₀₁ fundamental mode into the high-order modes is explained by a traveling refractive index grating accompanying a population grating induced by the mode interference field. The origin of the refractive index gratings is discussed. The threshold power for the transverse mode instability is found to depend on the fiber core diameter, numerical aperture, dopant concentration and the signal bandwidth. The threshold power is observed to decrease dramatically in the presence of a backward reflection of a signal from the output fiber facet.

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Oleg Antipov, Maxim Kuznetsov, Valentin Tyrtyshnyy, and Dmitry Alekseev "Low-threshold mode instability in few-mode Yb³⁺-doped fiber amplifiers: an overview of recent results", Proc. SPIE 11665, Fiber Lasers XVIII: Technology and Systems, 116650T (5 March 2021); https://doi.org/10.1117/12.2588431

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