Mitigation of mode instabilities by dynamic excitation of fiber modes

Hans-Jürgen Otto; Cesar Jauregui; Fabian Stutzki; Florian Jansen; Jens Limpert; Andreas Tünnermann

doi:10.1117/12.2003837

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22 March 2013 Mitigation of mode instabilities by dynamic excitation of fiber modes

Hans-Jürgen Otto, Cesar Jauregui, Fabian Stutzki, Florian Jansen, Jens Limpert, Andreas Tünnermann

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Proceedings Volume 8601, Fiber Lasers X: Technology, Systems, and Applications; 86010A (2013) https://doi.org/10.1117/12.2003837
Event: SPIE LASE, 2013, San Francisco, California, United States

Abstract

By dynamically varying the power content of the excited fiber modes of the main amplifier of a fiber-based MOPA system at high average output power levels, it was possible to mitigate mode instabilities to a large extent. In order to achieve the excitation variation, we used an acousto-optic deflector in front of the Yb-doped rod-type fiber. Therewith, it was possible to significantly increase both the average and the instantaneous minimum power content of the fundamental mode. This, consequently, led to a substantial improvement of the beam quality and pointing stability at power levels well beyond the threshold of mode instabilities.

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Hans-Jürgen Otto, Cesar Jauregui, Fabian Stutzki, Florian Jansen, Jens Limpert, and Andreas Tünnermann "Mitigation of mode instabilities by dynamic excitation of fiber modes", Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 86010A (22 March 2013); https://doi.org/10.1117/12.2003837

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