title: Efficient single-frequency fiber lasers with novel photosensitive Er/Yb optical fibers.
abstract: Boron- and germanium-doped highly photosensitive cladding is used in a novel design to achieve photosensitive Er/Yb-doped fibers, permitting short, strong gratings (length approximately 1 cm, reflectivity >99%) to be written without hydrogenation. The high absorption at 980 nm in Er/Yb fibers permits efficient pump absorption over a short device length, which is ideal for achieving highly efficient single-frequency fiber lasers. Both single-frequency Bragg-grating reflector and distributed-feedback lasers with slope efficiencies of 25% with respect to launched pump power have been realized in such fibers.
authors.affiliation: Optoelectronics Research Centre, The University of Southampton, Southampton SO17 1BJ, UK.
authors.forename: L
authors.initials: L
authors.lastname: Dong
authors.forename: W H
authors.initials: WH
authors.lastname: Loh
authors.forename: J E
authors.initials: JE
authors.lastname: Caplen
authors.forename: J D
authors.initials: JD
authors.lastname: Minelly
authors.forename: K
authors.initials: K
authors.lastname: Hsu
authors.forename: L
authors.initials: L
authors.lastname: Reekie