Abstract
The thresholds of laser-induced darkening in different optical and laser glasses irradiated by a 800nm, 120fs, 1kHz Ti:sapphire laser are reported for the first time. The ESR spectra of irradiated glass show laser-induced darkening results from color-center generation. The glasses are transparent in the wavelength of 800nm, so we suggest that color-center is generated through multi-photon absorption.
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