Effect of surface relaxation on stress failure in laser-irradiated glass

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Abstract
An analytic study is conducted to determine the effect of stress and structural relaxation on stress failure in laser-irradiated BK-7 glass. Both short (10 μs) and long (1 s) pulses of CO2 and DF laser radiation are considered. The model for the glass temperature consists of the one-dimensional diffusion equation with a source term to account for absorption of energy from the laser beam. Stresses are calculated from an analysis which includes the effect of relaxation at the irradiated surface. The model indicates that the surface stress is strongly dependent on the absorption coefficient of the glass at the laser wavelength and on the laser pulse duration. The implication of these results as to the failure mode in glass subjected to high intensity CO2 and DF radiation is discussed.

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