Photoluminescence (PL) of type III (highhyphen;purity wet synthetic) silica excited by a XeCl excimer laser (hngr;=4 eV) is reported. Timehyphen;resolved spectra show that a PL band peaked at 1.9 eV can be induced by the XeCl laser irradiation. This band exhibits a fast rise time (20 ns) but a decay time of several microseconds. The possible mechanisms of photogeneration and photoexcitation of the defects related to this emission are discussed.
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