Visible-region absorption and fluorescence are first observed for GeO2-doped silica optical fibres propagated by UV light in the 350–370 nm region. An absorption band at 1.97 eV and fluorescence at 1.91 eV are observed in the UV-propagated fibre. The absorption and fluorescence are considered to be caused by creation of the oxygen-hole centre.
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Noguchi et al. (1986) studied this question.
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