Chinese Optics Letters, 2013, 11 (4): 041402, Published Online: Mar. 12, 2013
Residual stress near cracks of K9 glass under 1 064-nm nanosecond laser irradiation
140.3330 Laser damage 160.6030 Silica 140.3390 Laser materials processing 140.3470 Lasers, carbon dioxide
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.
Zhen Zhang, Hongjie Liu, Jin Huang, Xiaoyan Zhou, Xinlu Cheng, Xiaodong Jiang, Weidong Wu, Wanguo Zheng. Residual stress near cracks of K9 glass under 1 064-nm nanosecond laser irradiation[J]. Chinese Optics Letters, 2013, 11(4): 041402.