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Femtosecond laser-induced apodized Bragg grating waveguides

: Zeil, P.; Voigtländer, C.; Thomas, J.; Richter, D.; Nolte, S.


Optics Letters 38 (2013), Nr.13, S.2354-2356
ISSN: 0146-9592
Fraunhofer IOF ()

We report on the inscription of apodized Bragg grating waveguides (BGWs) in fused silica using a modulated high repetition rate fs laser system. Tailoring of the grating's coupling strength is facilitated by appropriately substruc-turing the modulation of the inscribing laser radiation. The proposed alteration delivers an unchanged constant mean refractive index entailing homogeneous guiding properties along the entire waveguide. The BGWs fabricated using a Gaussian apodized modulation profile exhibit a 10 dB improvement in sideband suppression compared to waveguide gratings written with a uniform modulation profile.