Highly Coherent 1.5–8.3 μm Broadband Supercontinuum Generation in Tapered As–S Chalcogenide Fibers

We reported a highly coherent broadband supercontinuum (SC) generation in As–S chalcogenide tapered fibers pumped at 3.75 μm. The fiber preforms based on As–S glasses with a core/cladding diameter ratio of 1:25 were fabricated via isolated stacked extrusion. The waist diameters of tapered fibers can be changed by controlling the parameter of homemade tapering platform to realize all-normal dispersion characteristic. A broadband SC generation spanning from 1.5 to 8.3 μm was obtained in a 15-cm-long tapered fiber with waist core diameter of 4.8 μm. And high coherence property of the generated SC spectrum was investigated and verified by the simulation. The effect of different waist core diameters on SC spectra coherence properties was also investigated by numerical simulation.