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Continuously chirped fiber Bragg gratings by femtosecond laser structuring

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Abstract

We report on what we believe to be the first successful inscription of continuously chirped fiber Bragg gratings (CCFBG) into a nonphotosensitive single-mode fiber (SMF) with near-IR femtosecond laser pulses. The continuous chirp was achieved by inscribing into a bent fiber using a phase mask scanning technique. We fabricated a 20mm long CCFBG with a bandwidth of 6nm and a maximal reflectivity of 50%. The second-order dispersion of the CCFBG of up to 28ps2 was measured with spectral interferometry.

© 2008 Optical Society of America

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