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Measuring thermal load in fiber amplifiers in the presence of transversal mode instabilities

: Beier, F.; Plötner, M.; Sattler, B.; Stutzki, F.; Walbaum, T.; Liem, A.; Haarlammert, N.; Schreiber, T.; Eberhardt, R.; Tünnermann, A.


Optics Letters 42 (2017), No.21, pp.4311-4314
ISSN: 0146-9592
Bundesministerium für Bildung und Forschung BMBF
European Commission EC
H2020; 670557; MIMAS
Multi-dimensional interferometric amplification of ultrashort laser pulses
Journal Article
Fraunhofer IOF ()

We report on detailed in situ distributed temperature measurements inside a high power fiber amplifier. The deducted thermal load and the transversal mode instability (TMI) threshold of a commercial large mode area fiber with 25 mu m core and 400 mu m cladding were measured at various seed wavelengths. By matching these results with detailed simulations we show that photodarkening has a negligible impact on the thermal load and, therefore, on the TMI threshold in this fiber.