22 March 2013 Mitigation of mode instabilities by dynamic excitation of fiber modes
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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, 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); doi: 10.1117/12.2003837; https://doi.org/10.1117/12.2003837
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