In this work, the authors demonstrate external compensation of the intermodal phase difference of the laser comb output by using a grating compressor. The compressor introduces a controlled group delay dispersion, which compensates for the intrinsic second-order dispersion of the lasing medium. In this way, they obtain a uniform train of 12-ps-short, high-peak power pulses from an initial phase-modulated continuous wave; the duration of the pulses is essentially limited by higher-order dispersion. This proof of concept opens the path to direct generation of short pulses in the mid-infrared in compact chip-scale devices.
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