Abstract
The amplitude of the 5 eV optical absorption band of oxygen-deficient germanium-doped silica samples (3GeO 2:97SiO 2) was varied by annealing in oxygen at 1000°C for different periods of time. Each sample was irradiated with the same dose of 5 eV light from a KrF excimer laser to study the effect of the absorption band amplitude on the photo-induced changes. ESR (Electron spin resonance) and optical absorption measurements were carried out after each annealing and each laser irradiation cycle. We find that samples with an initially higher 5 eV absorption band amplitude exhibit a larger increase in the absorption bands related to the photo-induced paramagnetic Ge E′ and GEC (Germanium Electron Center) when irradiated with the same laser dose. Deconvolution of the measured spectra shows that the concentrations of the photo-induced paramagnetic Ge E′ and GEC defects are well correlated with the concentration of GLPC (germanium lone pair center) defects associated with a 5.14 eV absorption band.
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