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High average power nonlinear compression to 4 GW, sub-50 fs pulses at 2 μm wavelength

: Gebhardt, M.; Gaida, C.; Stutzki, F.; Hädrich, S.; Jauregui, C.; Limpert, J.; Tünnermann, A.


Optics Letters 42 (2017), No.4, pp.747-750
ISSN: 0146-9592
Journal Article
Fraunhofer IOF ()

The combination of high-repetition-rate ultrafast thuliumdoped fiber laser systems and gas-based nonlinear pulse compression in waveguides offers promising opportunities for the development of high-performance few-cycle laser sources at 2 μm wavelength. In this Letter, we report on a nonlinear pulse compression stage delivering 252 μJ, sub-50 fs-pulses at 15.4 W of average power. This performance level was enabled by actively mitigating ultrashort pulse propagation effects induced by the presence of water vapor absorptions.