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Dispersion tailoring of femtosecond laser written chirped fiber Bragg gratings by selective femtosecond laser post-processing

: Imogore, T.O.; Krämer, R.G.; Goebel, T.A.; Matzdorf, C.; Richter, D.; Nolte, S.


Optics Letters 45 (2020), Nr.23, S.6526-6529
ISSN: 0146-9592
ISSN: 1539-4794
Fraunhofer IOF ()

We present the tuning of the dispersion properties of a femtosecond (fs) laser inscribed chirped fiber Bragg grating (CFBG), realized by selectively modifying the refractive index of the already inscribed CFBG by fs laser post-processing. This Letter demonstrates for the first time, to the best of our knowledge, a flexible approach for tailoring higher-order dispersion terms of a fs inscribed CFBG via fs post-processing of selected grating regions, thus paving the way, e.g., for applications in dispersion management of ultrashort pulse fiber lasers.