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Proceedings Paper

Low-threshold mode instability in Yb3+-doped few-mode fiber amplifiers: influence of a backward reflection
Author(s): Oleg Antipov; Maxim Kuznetsov; Valentin Tyrtyshnyy; Dmitry Alekseev; Oleg Vershinin
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Paper Abstract

Spatio-temporal instability of the fundamental mode in Yb3+-doped few-mode PM fiber amplifiers with a core diameter of 8-10 μm was studied experimentally and theoretically. The mode instability threshold was registered at 1-100 Watts pump power. The threshold was found to decrease dramatically in the presence of a backward reflection of the signal from the output fiber end or an external counter-propagating beam; an increase of the signal bandwidth or input power resulted in the increase of the threshold. Numerical simulation revealed a self-consistent growth of the higher-order mode and a traveling electronic index grating accompanying the population grating induced by the mode interference field (due to different polarizability of the excited and unexcited Yb3+ ions).

Paper Details

Date Published: 9 March 2016
PDF: 10 pages
Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 97280A (9 March 2016); doi: 10.1117/12.2218265
Show Author Affiliations
Oleg Antipov, Institute of Applied Physics of Russian Academy of Sciences (Russian Federation)
Nizhni Novgorod State Univ. (Russian Federation)
Maxim Kuznetsov, Institute of Applied Physics of Russian Academy of Sciences (Russian Federation)
Valentin Tyrtyshnyy, IRE-Polus Co. (Russian Federation)
Dmitry Alekseev, IRE-Polus Co. (Russian Federation)
Moscow Institute of Physics and Technology (Russian Federation)
Oleg Vershinin, IRE-Polus Co. (Russian Federation)
Moscow Institute of Physics and Technology (Russian Federation)


Published in SPIE Proceedings Vol. 9728:
Fiber Lasers XIII: Technology, Systems, and Applications
John Ballato, Editor(s)

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