title: Chirped fiber Bragg gratings written with ultrashort pulses and a tunable phase mask.
abstract: We report a fabrication technique for chirped fiber Bragg gratings (CFBGs) using a flexible setup based on a poly(methyl-methacrylate) phase mask. The period of the phase mask can be thermally tuned during the inscription process, allowing the grating period of uniform fiber Bragg gratings to be shifted about 7 nm by a temperature change of 74 K. In addition, CFBGs with bandwidths up to 2 nm are demonstrated in non-photosensitive fibers by IR femtosecond inscription.
authors.affiliation: Institute of Applied Physics, Friedrich-Schiller-University Jena, Max-Wien-Platz 1, D-07743 Jena, Germany. ch.voigtlaender@uni-jena.de
authors.forename: Christian
authors.initials: C
authors.lastname: Voigtländer
authors.forename: Jens
authors.initials: J
authors.lastname: Thomas
authors.forename: Elodie
authors.initials: E
authors.lastname: Wikszak
authors.forename: Peter
authors.initials: P
authors.lastname: Dannberg
authors.forename: Stefan
authors.initials: S
authors.lastname: Nolte
authors.forename: Andreas
authors.initials: A
authors.lastname: Tünnermann