title: Stokes amplification regimes in quasi-cw pumped hydrogen-filled hollow-core photonic crystal fiber.
abstract: Pure rotational stimulated Raman scattering spectra containing nine strong spectral components were generated from a approximately 11 m long hollow-core photonic crystal fiber filled with hydrogen and pumped with nanosecond pulses having energies around 100-300 nJ. Observation of both transient and steady-state scattering threshold behavior is reported. Passage from the transient to the steady state is observed with a pulse as long as 14 ns. Convenient analytical expressions for energy and power threshold are deduced for the present configuration.
authors.affiliation: Photonics and Photonic Materials Group, Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom.
authors.forename: F
authors.initials: F
authors.lastname: Benabid
authors.forename: G
authors.initials: G
authors.lastname: Antonopoulos
authors.forename: J C
authors.initials: JC
authors.lastname: Knight
authors.forename: P St J
authors.initials: PS
authors.lastname: Russell