title: Strong long-period fiber gratings recorded at 352 nm.
abstract: We describe long-period grating inscription in hydrogenated telecom fibers by use of high-intensity femtosecond 352 nm laser pulses. We show that this technique allows us to fabricate high-quality 30 dB gratings of 300 microm period and 2 cm length by use of a three-photon absorption mechanism.
authors.affiliation: Photonics Research Group, Electronic Engineering, Aston University, Birmingham B4 7ET, UK.
authors.forename: Mykhaylo
authors.initials: M
authors.lastname: Dubov
authors.forename: Ian
authors.initials: I
authors.lastname: Bennion
authors.forename: Stephen A
authors.initials: SA
authors.lastname: Slattery
authors.forename: David N
authors.initials: DN
authors.lastname: Nikogosyan