We report the generation of a mid-infrared supercontinuum created by ≈7.5 ps duration pulses at 3260 nm passing through a dispersion engineered ${\mathrm{As}}_2{\mathrm{S}}_3$ rib waveguide. The threshold for a 6.6 cm long waveguide was around 800 W and at 1700 W the spectrum extended from $\approx 2.9–4.2\mathrm{\mu m}$ and was limited on the long wavelength side by absorption in the cladding of this particular waveguide.

© 2012 Optical Society of America

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