Abstract
excimer-laser irradiation induces two major changes in glass impregnated with molecules. First, the vacuum–UV optical absorption edge is bleached, and the absorption at 157 nm decreases from 0.95 to . Second, preexisting free SiOH groups and interstitial are photochemically converted to hydrogen-bonded hydroxyl groups. It is suggested that the bleaching of the UV-absorption edge is caused by a change of OH groups from a free to a hydrogen-bonded state and by photolysis of distorted Si—O bonds that are absorbing in the edge region.
© 1999 Optical Society of America
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