Abstract
We present results of the study of 193 nm laser-induced densification of fused silica as a function of incident laser fluence and pulse count. We describe an internally self-consistent experiment involving the simultaneous irradiation of 12 samples of two different grades, at fluences varying by two orders of magnitude and pulse counts exceeding 1.5 × 10 9. We are able to establish the existence of a dose-rate dependence of the densification phenomenon and to characterize the empirical rate constants as a function of fluence for two different grades of fused silica.
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