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Numerical simulation of light intensity distribution in the vicinity of three-dimensional Hertzian conical scratch on fused silica subsurface

Hua Jin-Rong Zu Xiao-Tao Li Li Xiang Xia Chen Meng Jiang Xiao-Dong Yuan Xiao-Dong Zheng Wan-Guo

Numerical simulation of light intensity distribution in the vicinity of three-dimensional Hertzian conical scratch on fused silica subsurface

Hua Jin-Rong, Zu Xiao-Tao, Li Li, Xiang Xia, Chen Meng, Jiang Xiao-Dong, Yuan Xiao-Dong, Zheng Wan-Guo
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  • Received Date:  15 May 2009
  • Accepted Date:  23 July 2009
  • Published Online:  05 February 2010

Numerical simulation of light intensity distribution in the vicinity of three-dimensional Hertzian conical scratch on fused silica subsurface

  • 1. (1)电子科技大学物理电子学院,成都 610054; (2)电子科技大学物理电子学院,成都 610054;中国工程物理研究院激光聚变研究中心,绵阳 621900; (3)中国工程物理研究院激光聚变研究中心,绵阳 621900

Abstract: The main factor of laser induced damage is the modulation caused by the scratch in the subsurface of the fused silica. The three-dimensional Hertzian conical scratch (HCS) model on the exit surface is establised in this article. Three-dimensional finite-difference time-domain method is used to calculate and simulate the electric field intensity distribution in the vicinity of HCS. The effects of depth, radius and gradient angle of the HCS on incident light field modulation are analyzed, respectively. The results show that the electric field enhancement in the center of HCS is the largest. This area is apt to be damaged. The maximal electric field intensity in the fused silica will be enhanced as the depth of the HCS changes from λ to 19λ/2. The fused silica is liable to be damaged while the radius of HCS is below 15λ. When the radius is larger than 175λ, the maximal electric fields in the fused silica tend to be 2.5 V/m. And the maximal electric fields are independent on the radius. The effect of light intensity enhancement is more obviously when total internal reflection occurs between internal interface of HCS and the rear surface of fused silica.

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