Abstract

Long-range surface transformations in silicate glasses and a-Si wereobserved after high-power laser pulse irradiation. Under laser excitation, intense shock waves propagated hemispherically into the bulk. In silicate glasses, cracks and liquid drops appeared outside the laser-irradiated region over a distance of many millimeters. Such a long-range crack formation became visible at 12 hours after laser irradiation. Long-range and delayed crack formation is caused by chemical reactions at microcracks in the surface induced by laser-driven shock. In a-Si, high-power laser irradiation caused ring-shaped crystallization in non-irradiated regions. It was pointed out that laser-driven shock waves play an important role in surface transformations ducting high-power laser pulse irradiation.

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