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High-power tandem pumped fiber amplifier with an output power of 2.9 kW

: Wirth, C.; Schmidt, O.; Kliner, A.; Schreiber, T.; Eberhardt, R.; Tünnermann, A.


Optics Letters 36 (2011), No.16, pp.3061-3063
ISSN: 0146-9592
Journal Article
Fraunhofer IOF ()

We report on a high power fiber amplifier tandem pumped by an industrial style thin-disk laser. An output power of 1 kW and a very good slope efficiency of 73% have been obtained for a state-of-the-art photonic crystal fiber originally designed for short-pulse amplification. We also compare this result to an experiment, where a power of 2.9 kW could be obtained from a step-index large-mode-area fiber with the same slope efficiency.