title: Cascaded Raman shifting of high-peak-power nanosecond pulses in As₂S₃ and As₂Se₃ optical fibers.
abstract: We report efficient cascaded Raman scattering of near-IR nanosecond pulses in large-core (65 μm 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 ~2 ns pump pulses at a wavelength of 1.9 μm, four Stokes peaks, all with peak powers greater than 1 kW, have been measured.
authors.affiliation: School of Chemistry & Physics and Institute for Photonics & Advanced Sensing (IPAS), The University of Adelaide, Adelaide, South Australia 5005, Australia.
authors.forename: Richard T
authors.initials: RT
authors.lastname: White
authors.forename: Tanya M
authors.initials: TM
authors.lastname: Monro