title: Two-photon photochemical long-period grating fabrication in pure-fused-silica photonic crystal fiber.
abstract: We report what is to our knowledge the first photochemical fabrication of a long-period grating in a pure-fused-silica photonic crystal fiber. The inscription technique is based on a two-photon absorption mechanism and does not require a specially designed photonic crystal fiber with a photosensitive Ge-doped core. The characteristic fluence value for the inscription is an order of magnitude less than that for a standard telecom fiber irradiated under similar conditions with the same grating parameters.
authors.affiliation: Optoelectronics Research Centre, University of Southampton, UK.
authors.forename: Gilberto
authors.initials: G
authors.lastname: Brambilla
authors.forename: Andrei A
authors.initials: AA
authors.lastname: Fotiadi
authors.forename: Stephen A
authors.initials: SA
authors.lastname: Slattery
authors.forename: David N
authors.initials: DN
authors.lastname: Nikogosyan