title: Refractive-Index Changes of Standard Telecommunication Fiber through Exposure to Femtosecond Laser Pulses at 810 cm.
abstract: We report on permanent refractive-index changes as great as 6 x 10(-3) in standard fibers on irradiation with tightly focused femtosecond (120-fs) near-IR (lambda = 800-nm) pulses. The refractive-index increase was measured through changes in the transmission spectrum of an UV photowritten Bragg-grating-based Fabry-Perot interferometer. We depict the dependence of the index variation on exposure time. The changes in refractive index can be optimized after a few seconds of irradiation. The measured induced excess loss increases during near-IR exposure.
authors: E
authors: E
authors: Fertein
authors: C
authors: C
authors: Przygodzki
authors: H
authors: H
authors: Delbarre
authors: A
authors: A
authors: Hidayat
authors: M
authors: M
authors: Douay
authors: P
authors: P
authors: Niay