Abstract
In this Letter, we present an optimized nonlinear amplification scheme in the 2μm wavelength region. This laser source delivers 50fs pulses at an 80MHz repetition rate with exceptional temporal pulse quality and 20W of average output power. According to predictions from numerical simulations, it is experimentally confirmed that dispersion management is crucial to prevent the growth of side pulses and an increase of the energy content in a temporal pedestal surrounding the self-compressed pulse. Based on these results, we discuss guidelines to ensure high temporal pulse quality from nonlinear femtosecond fiber amplifiers in the anomalous dispersion regime.
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