Abstract

We report efficient cascaded Raman scattering of near-IR nanosecond pulses in large-core (65μm diameter) As2S3 and As2Se3 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 2ns pump pulses at a wavelength of 1.9μm, four Stokes peaks, all with peak powers greater than 1kW, have been measured.

© 2011 Optical Society of America

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