23 January 1997 Stress-dependent kinetics of UV-induced refractive index change in germanosilicate fibers
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Abstract
We show that kinetics of Bragg grating formation are sensitive to the external stress applied on the fiber. This leads us to revisit the model of variable reaction pathway (VAREPA model) which accounts for the experimental index change power law. Conclusions are that a power law is still obtained for low sensitivity, just the pre-exponential factor is changed. This is consistent with the experiment. However, an isotropic strain dependent VAREPA model gives rise to an equivalent sensitivity on the mean index and on the modulation which is not consistent with the experiment. It is thus not excluded that another mechanism leading to stress redistribution was active.
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Bertrand Poumellec, Pierre Niay, Thierry Taunay, "Stress-dependent kinetics of UV-induced refractive index change in germanosilicate fibers", Proc. SPIE 2998, Photosensitive Optical Materials and Devices, (23 January 1997); doi: 10.1117/12.264200; https://doi.org/10.1117/12.264200
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