title: Fiber bragg gratings made with a phase mask and 800-nm femtosecond radiation.
abstract: High-quality retroreflecting fiber Bragg gratings were written in standard Ge-doped telecom fiber (Corning SMF-28) after a few minutes exposure with pulsed 800-nm, 120-fs laser radiation by use of a deep-etch silica zero-order nulled phase mask optimized for 800 nm. Induced index modulations of 1.9 x 10(-3) were achieved with peak power intensities of 1.2 x 10(13) W/cm2 without any fiber sensitization. The fiber gratings are stable and did not erase after 2 weeks at 300 degrees C. The primary mechanism of induced index change results from a structural modification to the fiber core.
authors.affiliation: Communications Research Centre Canada, 3701 Carling Avenue, PO Box 11490, Station H, Ottawa, Ontario K2H 8S2, Canada. stephen.mihailov@crc.ca
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Mihailov
authors.forename: Christopher W
authors.initials: CW
authors.lastname: Smelser
authors.forename: Ping
authors.initials: P
authors.lastname: Lu
authors.forename: Robert B
authors.initials: RB
authors.lastname: Walker
authors.forename: Dan
authors.initials: D
authors.lastname: Grobnic
authors.forename: Huimin
authors.initials: H
authors.lastname: Ding
authors.forename: George
authors.initials: G
authors.lastname: Henderson
authors.forename: James
authors.initials: J
authors.lastname: Unruh