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Continuously chirped fiber Bragg gratings by femtosecond laser structuring

: Thomas, J.; Voigtlander, C.; Schimpf, D.; Stutzki, F.; Wikszak, E.; Limpert, J.; Nolte, S.; Tünnermann, A.


Optics Letters 33 (2008), Nr.14, S.1560-1562
ISSN: 0146-9592
Fraunhofer IOF ()
phase mask; inscription

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 20 mm long CCFBG with a bandwidth of 6 mm and a maximal reflectivity of 50%. The second-order dispersion of the CCFBG of up to 28 ps(2) was measured with spectral interferometry.