Abstract

We report on infrared supercontinuum (SC) generation through laser filamentation and subsequent nonlinear propagation in a step-index ${\mathrm{As}}_2{\mathrm{S}}_3$ fiber. The 100 μm core and high-purity ${\mathrm{As}}_2{\mathrm{S}}_3$ fiber used exhibit zero-dispersion wavelength around 4.5 μm, a mid-infrared background loss of $0.2\mathrm{dB}/\mathrm{m}$, and a maximum loss of only $0.55\mathrm{dB}/\mathrm{m}$ at the S-H absorption peak around 4.05 μm. When pumping with ultrashort laser pulses slightly above the S-H absorption band, broadband infrared supercontinua were generated with a 20 dB spectral flatness spanning from 1.5 up to 7 μm. The efficiency and spectral shape of the SC produced by ultrashort pulses in large-core ${\mathrm{As}}_2{\mathrm{S}}_3$ fiber are mainly determined by its dispersion, the S-H contaminant absorption, and the mid-infrared nonlinear absorption.

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