title: Fabrication and thermal decay of fiber Bragg gratings in pristine and H2-loaded Bi-Al co-doped optical fibers.
abstract: A cw-244-nm-Ar(+) laser was used to fabricate Bragg gratings in pristine and H(2)-loaded Bi-Al-SiO(2) optical fibers with index changes as high as 3.6 × 10(-4) and 19.3 × 10(-4), respectively. For comparison, fiber Bragg gratings in pristine and H(2)-loaded SMF-28e showed index changes of 13.6 × 10(-4) and 63.3 × 10(-4). Continuous isochronal thermal annealing revealed higher thermal stability for the H(2)-loaded Bi-Al-SiO(2) fiber compared to the pristine one. The SMF-28e fibers, with and without hydrogen, were more stable than the Bi-Al-SiO(2) fibers.
authors.affiliation: Ecole Polytechnique Fédérale de Lausanne (EPFL), School of Engineering, CH-1015 Lausanne, Switzerland.
authors.forename: Georgios
authors.initials: G
authors.lastname: Violakis
authors.forename: Hans G
authors.initials: HG
authors.lastname: Limberger
authors.forename: Valery M
authors.initials: VM
authors.lastname: Mashinsky
authors.forename: Evgeny M
authors.initials: EM
authors.lastname: Dianov