Abstract

We report efficient cascaded Raman scattering of near-IR nanosecond pulses in large-core ($65\mathrm{\mu m}$ diameter) ${\mathrm{As}}_2{\mathrm{S}}_3$ and ${\mathrm{As}}_2{\mathrm{Se}}_3$ optical fibers. Raman scattering dominates other spectral broadening mechanisms, such as four-wave mixing, modulation instability, and soliton dynamics, because the fibers have large normal group-velocity dispersion in the spectral range of interest. With $\sim 2\mathrm{ns}$ pump pulses at a wavelength of $1.9\mathrm{\mu m}$, four Stokes peaks, all with peak powers greater than $1\mathrm{kW}$, have been measured.

© 2011 Optical Society of America

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