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Adaptive pre-amplification pulse shaping in a high-power, coherently combined fiber laser system

: Becker, N.C.; Hädrich, S.; Eidam, T.; Just, F.; Osvay, K.; Várallyay, Z.; Limpert, J.; Tünnermann, A.; Pertsch, T.; Eilenberger, F.


Optics Letters 42 (2017), No.19, pp.3916-3919
ISSN: 0146-9592
Journal Article
Fraunhofer IOF ()

We report on the successful implementation of an adaptive pre-amplification pulse shaping technique in a high-power, coherently combined fiber laser system to achieve sub-300-fs pulse durations at 320 W average power and 3.2 mJ pulse energy. The pulse shaper is utilized to impose a gain flattening mask to increase the spectral width of the amplified pulse by 60%. Simultaneously, it pre-compensates the spectral phase acquired in the multi-stage amplification and subsequent compression including the eight-channel, coherently combined main amplification stage. This result does significantly enhance the performance of the fiber laser system and the subsequent nonlinear compression stages.