Abstract
We report efficient cascaded Raman scattering of near-IR nanosecond pulses in large-core ( diameter) and 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 pump pulses at a wavelength of , four Stokes peaks, all with peak powers greater than , have been measured.
© 2011 Optical Society of America
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