We report on an experimental demonstration of mid-infrared cascaded supercontinuum generation in commercial silica, fluoride, and chalcogenide fibers as a potentially cheap and practical alternative to direct pumping schemes. A pump continuum up to 4.4 μm was generated in cascaded silica and fluoride fibers by an amplified 1.55 μm nanosecond diode laser. By pumping a commercial Ge10As22Se68 single-material photonic crystal fiber with 135.7 mW of the pump continuum from 3.5- 4.4 μm, we obtained a continuum up to 7.2 μm with a total output power after the collimating lens of 54.5 mW, and 3.7 mW above 4.5 μm.
Christian Rosenberg Petersen, Peter M. Moselund, Christian Petersen, Uffe Møller, and Ole Bang, "Mid-IR supercontinuum generation beyond 7 μm using a silica-fluoride-chalcogenide fiber cascade," Proc. SPIE 9703, Optical Biopsy XIV: Toward Real-Time Spectroscopic Imaging and Diagnosis, 97030A (Presented at SPIE BiOS: February 15, 2016; Published: 7 March 2016); https://doi.org/10.1117/12.2209253.
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