Dong, L., Archambault, J.L., Reekie, L., Russell, P.St.J. and Payne, D.N.
A study of photo-induced absorption change in germanosilicate preforms: evidence for the colour-centre model of photosensitivity
Applied Optics, 34, (18), . (doi:10.1364/AO.34.003436).
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A new technique has enabled us to resolve the strong UV absorption spectrum in W-exposed germanosilicate preforms. Our results show, for the first time to our knowledge, that the large photoinduced absorption changes between 165 and 300 nm (~700 dB/mm at 195 nm has been observed) can account for ~3 x 10^-4 of index change at 1.5 µm. The thermal-annealing dynamics of the photoinduced absorption changes also resemble those of fiber gratings, evidence that the color-center model of photosensitivity plays an important role in the photoinduced index changes in UV-written fiber gratings. We also find that the photoinduced absorption changes depend linearly on germania (i.e., germanium dioxide) concentrations in the preforms, and their exposure-time dependence can be fitted with a stretched-exponential function.
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