23 January 1997 Phenomenological model of UV-induced Bragg grating growth in germanosilicate fibers
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Germanium doped glasses show a permanent increase of the refractive index after illumination with UV light. With a UV interference pattern produced by a phasemask, permanent Bragg gratings can be induced in optical fibers and planar waveguides. The growth of these Bragg gratings shows oscillations meaning that the grating reflectivity raises, reaches a maximum, then vanishes slowly and raises again to another maximum. We have recorded the first oscillation in more than ten different non-sensitized germanosilicate fibers. In this paper we present a model of the growth behavior, relating it to the visibility of the interference pattern generated by the phasemask, showing that the coherence of the laser light used to induce the grating has a strong influence on the growth behavior of the Bragg grating. The model is in excellent agreement with the measured grating growth behavior.
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Joerg Huebner, Joerg Huebner, Mikael Svalgaard, Mikael Svalgaard, Lars Gruener-Nielsen, Lars Gruener-Nielsen, Martin Kristensen, Martin Kristensen, } "Phenomenological model of UV-induced Bragg grating growth in germanosilicate fibers", Proc. SPIE 2998, Photosensitive Optical Materials and Devices, (23 January 1997); doi: 10.1117/12.264178; https://doi.org/10.1117/12.264178

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