title: Bragg grating fabrication in germanosilicate fibers by use of near-UV light: a new pathway for refractive-index changes.
abstract: Using 334-nm light, we demonstrate side writing of Bragg gratings with an index change of ~10(-4) in germanium-doped fibers. No hydrogen loading of the fibers was required. These gratings have the same temperature stability as gratings fabricated with 240-nm light. Our results suggest that photoionization is not needed for formation of gratings in Ge-doped glass. We observe an enhancement of the 334-nm photosensitivity in boron-codoped fibers and suggest that B facilitates a structural transformation of the glass.
authors.forename: D S
authors.initials: DS
authors.lastname: Starodubov
authors.forename: V
authors.initials: V
authors.lastname: Grubsky
authors.forename: J
authors.initials: J
authors.lastname: Feinberg
authors.forename: B
authors.initials: B
authors.lastname: Kobrin
authors.forename: S
authors.initials: S
authors.lastname: Juma