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Experimental observations of the threshold-like onset of mode instabilities in high power fiber amplifiers

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

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Optics Express 19 (2011), No.14, pp.13218-13224
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer IOF ()

We report on the observation and experimental characterization of a threshold-like onset of mode instabilities, i.e. an apparently random relative power content change of different transverse modes, occurring in originally single-mode high-power fiber amplifiers. Although the physical origin of this effect is not yet fully understood, we discuss possible explanations. Accordingly, several solutions are proposed in this paper to raise the threshold of this effect.