Abstract
We present the birefringence measurements induced in K9 specimen by cracks produced by 1
064-nm Nd:YAG laser. The birefringence data are converted into units of stress, permitting the
estimation of residual stress near cracks. The laser parameters and characterization of the optical
material influence the value of residual stress. Residual stress in optical materials can affect
fracture; thus, this factor should be considered in any formulation that involves enhanced damage
resistance of optical components used in laser-induced damage experiments. The probability of the
initial damage and the direction of the energy dissipation in cracks determine the residual stress
distribution. Moreover, thermal-stress coupling enlarges the asymmetry of residual stress
distribution. Therefore, the physical mechanism of asymmetric damage is useful for understanding the
nature of optical materials under high-power laser irradiation.
© 2013 Chinese Optics Letters
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