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Effect of thermal stresses on fused silica surface on the laser induced damage

Liu Hong-Jie Huang Jin Wang Feng-Rui Zhou Xin-Da Jiang Xiao-Dong Wu Wei-Dong

Effect of thermal stresses on fused silica surface on the laser induced damage

Liu Hong-Jie, Huang Jin, Wang Feng-Rui, Zhou Xin-Da, Jiang Xiao-Dong, Wu Wei-Dong
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Publishing process
  • Received Date:  04 March 2009
  • Accepted Date:  04 June 2009
  • Published Online:  05 January 2010

Effect of thermal stresses on fused silica surface on the laser induced damage

  • 1. 中国工程物理研究院激光聚变研究中心,绵阳 621900

Abstract: To study the effect of the thermal stresses on the optics, experiment is performed to measure the damage threshold of the two fused silica samples with one annealed to eliminate thermal stresses while the other not. The measurement includes the effects of the thermal stresses on the initial damage threshold of the fused silica, the damage growth threshold, and the damage growth laws. The results show that the damage threshold decreases as the thermal stresses increase, and the damage induced by the laser is accelerated by the thermal stresses. For the same laser intensity, the damage growth factor is higher for the area with higher thermal stresses, but the damage growth still obeys the exponential increase rule and no obvious effect of the thermal stresses is found on the damage growth threshold. The study here will determine to some extent whether the technology of the CO2 laser pretreatment can be applied to the large-aperture optics or not.

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