Abstract
We report the observation of crack formation in glass surfaces after high-power laser pulse irradiation. The damage in the irradiated region was caused by laser ablation and plasma formation, but cracks and liquid drops also appeared outside the irradiated region over a distance of many millimeters. These cracks and liquid drops became clearly visible at 12 h or more after laser irradiation in the surface of both soda-lime glass and borosilicate crown glass. In contrast, such a delayed formation was not observed in fused silica glass. It is considered that the delayed crack formation is caused by chemical interactions of the components of the glass with atmospheric water vapor at microcracks in the surface induced by laser-driven shock waves.
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