title: Matched cascade of bandgap-shift and frequency-conversion using stimulated Raman scattering in a tapered hollow-core photonic crystal fibre.
abstract: We report on a novel means which lifts the restriction of the limited optical bandwidth of photonic bandgap hollow-core photonic crystal fiber on generating high order stimulated Raman scattering in gaseous media. This is based on H(2)-filled tapered HC-PCF in which the taper slope is matched with the effective length of Raman process. Raman orders outside the input-bandwidth of the HC-PCF are observed with more than 80% quantum-conversion using a compact, low-power 1064 nm microchip laser. The technique opens prospects for efficient sources in spectral regions that are poorly covered by currently existing lasers such as mid-IR.
authors.affiliation: Gas-phase Photonic materials group, CPPM, Physics department, University of Bath, Claverton Down, Bath BA2 7AY, UK.
authors.forename: B
authors.initials: B
authors.lastname: Beaudou
authors.forename: F
authors.initials: F
authors.lastname: Couny
authors.forename: Y Y
authors.initials: YY
authors.lastname: Wang
authors.forename: P S
authors.initials: PS
authors.lastname: Light
authors.forename: N V
authors.initials: NV
authors.lastname: Wheeler
authors.forename: F
authors.initials: F
authors.lastname: Gérôme
authors.forename: F
authors.initials: F
authors.lastname: Benabid