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Chirped fiber Bragg gratings written with ultrashort pulses and a tunable phase mask

: Voigtländer, C.; Thomas, J.; Wikszak, E.; Dannberg, P.; Nolte, S.; Tünnermann, A.


Optics Letters 34 (2009), No.12, pp.1888-1890
ISSN: 0146-9592
Journal Article
Fraunhofer IOF ()
thermal expansion coefficient; femtosecond laser; fabrication

We report a fabrication technique for chirped fiber Bragg gratings (CFBGs) using a flexible setup based on a poly(methyl-methacrylate) phase mask. The period of the phase mask can be thermally tuned during the inscription process, allowing the grating period of uniform fiber Bragg gratings to be shifted about 7 nm by a temperature change of 74 K. In addition, CFBGs with bandwidths up to 2 nm are demonstrated in non-photosensitive fibers by IR femtosecond inscription.