A study of photo-induced absorption change in germanosilicate preforms: evidence for the colour-centre model of photosensitivity
Dong, L., Archambault, J.L., Reekie, L., Russell, P.St.J. and Payne, D.N. (1995) A study of photo-induced absorption change in germanosilicate preforms: evidence for the colour-centre model of photosensitivity. Applied Optics, 34, (18), 3436-3440. (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.
|Subjects:||Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
|Divisions:||University Structure - Pre August 2011 > Optoelectronics Research Centre
|Date Deposited:||11 Mar 2010|
|Last Modified:||24 Aug 2015 15:44|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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