Refractive-index changes of standard telecommunication fiber through exposure to femtosecond laser pulses at 810 cm
- 20 July 2001
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 40 (21) , 3506-3508
- https://doi.org/10.1364/ao.40.003506
Abstract
We report on permanent refractive-index changes as great as 6 × 10-3 in standard fibers on irradiation with tightly focused femtosecond (120-fs) near-IR (λ = 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.Keywords
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