Abstract
Germanosilicate glass exhibits a strong absorption band at 240 nm which can be bleached upon excitation with UV radiation. Simultaneously, a permanent increase of the refractive index at longer wavelengths is seen. Experimental results indicate that the UV absorption band is due to germanium related oxygen deficient centers (GODC's). Excitation and bleaching of these defects triggers a range of not fully understood processes which are responsible for the UV induced index change. Photoluminescence (PL) bands at 290 nm and 400 nm have also been associated with GODC excitation and a correlation between the 400 nm PL dynamics and the dynamics of the index change has been reported 1. Other experiments indicate increased concentrations of Ge-related drawing induced defects (Ge-DID), associated with 650 nm luminscence, following UV irradiation of germanosilicate fiber preforms 2 Recent experiments have shown that UV induced index changes can be strongly non-linear as a function of the exposure time, with several maxima occuring during one UV exposure 3. In this paper we report results indicating that these non-linearities may be associated with a corresponding behavior of the UV induced luminescence.
© 1995 Optical Society of America
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