Abstract
The combination of high-repetition-rate ultrafast thulium-doped 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 2μm wavelength. In this Letter, we report on a nonlinear pulse compression stage delivering 252μJ, sub-50fs-pulses at 15.4W of average power. This performance level was enabled by actively mitigating ultrashort pulse propagation effects induced by the presence of water vapor absorptions.
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