title: Ytterbium fiber laser based on first-order fiber Bragg gratings written with 400 nm femtosecond pulses and a phase-mask.
abstract: A Fiber Bragg grating of 369 nm pitch was inscribed in a germanium-free double-clad ytterbium doped silica fiber using a femto-second pulse train at 400 nm wavelength and a phase mask. The photo-induced refractive index modulation of higher than 4 x 10(-3) was obtained and the accompanying photo-induced losses were subsequently removed by thermal annealing, resulting in a low loss (<0.1 dB), stable and high reflectivity (>40 dB) FBG. Based on this FBG, a monolithic Ytterbium fiber laser operating at 1073 nm with slope efficiency of 71% and output power of 13 W was demonstrated.
authors.affiliation: Centre d'Optique, Photonique et Laser, Université Laval, Québec, Canada. Martin.Bernier@copl.ulaval.ca
authors.forename: M
authors.initials: M
authors.lastname: Bernier
authors.forename: R
authors.initials: R
authors.lastname: Vallée
authors.forename: B
authors.initials: B
authors.lastname: Morasse
authors.forename: C
authors.initials: C
authors.lastname: Desrosiers
authors.forename: A
authors.initials: A
authors.lastname: Saliminia
authors.forename: Y
authors.initials: Y
authors.lastname: Sheng