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Simplified modelling the mode instability threshold of high power fiber amplifiers in the presence of photodarkening

: Jauregui, C.; Otto, H.J.; Stutzki, F.; Limpert, J.; Tünnermann, A.

Fulltext ()

Optics Express 23 (2015), No.16, pp.20203-20218
ISSN: 1094-4087
Bundesministerium für Bildung und Forschung BMBF
European Commission EC
Journal Article, Electronic Publication
Fraunhofer IOF ()

In this paper we present a simple model to predict the behavior of the transversal mode instability threshold when different parameters of a fiber amplifier system are changed. The simulation model includes an estimation of the photodarkening losses which shows the strong influence that this effect has on the mode instability threshold and on its behavior. Comparison of the simulation results with experimental measurements reveal that the mode instability threshold in a fiber amplifier system is reached for a constant average heat load value in good approximation. Based on this model, the expected behavior of the mode instability threshold when changing the seed wavelength, the seed power and/or the fiber length will be presented and discussed. Additionally guidelines for increasing the average power of fiber amplifier systems will be provided.