title: Bragg gratings photoinduced in ZBLAN fibers by femtosecond pulses at 800 nm.
abstract: Fiber Bragg gratings were written in thulium-doped and undoped single-mode ZBLAN fibers by focusing femtosecond laser pulses on the fiber core through a phase mask. Maximum index modulation of the order of 1 x 10(-3) was induced in both types of fibers. Measurements of the transverse refractive index changes across the core and cladding regions indicate that the grating formation originates from a negative index change.
authors: Centre d'Optique, Photonique et Laser, Université Laval, Québec G1K 7P4, Canada. martin.bernier.1@ulaval.ca
authors: M
authors: M
authors: Bernier
authors: D
authors: D
authors: Faucher
authors: R
authors: R
authors: Vallée
authors: A
authors: A
authors: Saliminia
authors: G
authors: G
authors: Androz
authors: Y
authors: Y
authors: Sheng
authors: S L
authors: SL
authors: Chin