We present a multi-octave, mid-infrared supercontinuum source spanning from 3.6μm and extending into long-wave infrared region out to 11μm with an exceptionally high conversion efficiency of 8.2% and output power of 39 mW. These results were enabled by intra-pulse difference frequency generation involving a femtosecond Thulium doped fiber laser, an indium fluoride fiber and a zinc germanium phosphide crystal.
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Khanolkar et al. (2024) studied this question.
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