Surface Transformations in Glass Initiated by Laser-Driven Shock

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Abstract
Long-range and delayed structural changes in glass surfaces were observed using high-power laser pulses. Under laser excitation, intense shock waves propagated hemispherically into the glass. Structural changes extended many millimeters beyond the area of the localized laser damage. The cracks were formed spirally around the localized damage site. These changes were clearly observed at 12 h after the laser irradiation. Long-range and delayed changes are caused by a chemical reaction under stress around cracks induced by laser-driven shock. It is also pointed out that laser-driven shock causes crystallization in a-Si.

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