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Variable wavefront tuning with a SLM for tailored femtosecond fiber Bragg grating inscription

: Voigtlander, C.; Krämer, R.G.; Goebel, T.A.; Richter, D.; Nolte, S.


Optics Letters 41 (2016), No.1, pp.17-20
ISSN: 0146-9592
Bundesministerium für Wirtschaft und Technologie BMWi
Journal Article
Fraunhofer IOF ()

We report on the inscription of fiber Bragg gratings using femtosecond laser pulses and the phase-mask technique. The wavefront of the inscription laser is variably tuned with a spatial light modulator (SLM). By applying Fresnel lenses with different focal lengths, the period of the fiber Bragg gratings could be shifted. A linear change of the grating period for a FBG inscribed with a third-order deformed wavefront and a quadratic-period behavior for a fourth-order wavefront could be verified experimentally for the first time.