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Mode instabilities in large-mode-area fiber amplifiers

: Eidam, T.; Jauregui, C.; Otto, H.-J.; Jansen, F.; Stutzki, F.; Limpert, J.; Tünnermann, A.


Institute of Electrical and Electronics Engineers -IEEE-:
Conference on Lasers and Electro-Optics Europe & International Quantum Electronics Conference, CLEO®/Europe-IQEC 2013 : 12-16 May 2013, Munich, Germany
Piscataway, NJ: IEEE, 2013
ISBN: 978-1-4799-0593-5 (Print)
ISBN: 978-1-4799-0594-2
1 S.
Conference on Lasers and Electro-Optics (CLEO Europe) <2013, Munich>
International Quantum Electronics Conference (IQEC) <2013, Munich>
Fraunhofer IOF ()

The onset of mode instabilities is an effect occurring in high-average-power fiber lasers and amplifiers when their output average power exceeds a certain threshold value [1]. This effect is characterized by a sudden change of the output beam from an initially stable fundamental mode to a regime with more or less chaotic fluctuations between the fundamental mode and one or more higher-order modes (shown in Fig. 1). Mode instabilities occur in different fiber architectures and they can additionally be observed both in continuous wave and in pulsed operation. Only a few years after the first mention of this effect in the literature, it has become one of the most severe limitations for the further average-power scaling of fiber lasers and amplifiers.