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熔石英亚表面缺陷对光场的调制是导致激光辐照场破坏的主要因素。采用有限元方法对熔石英亚表面缺陷(平面和锥形划痕)周围的光强分布进行了数值模拟。结果表明:划痕形状、几何尺寸、方位角、光的入射角等是影响划痕周围光强分布的主要因素;前表面划痕对光强的增强效果比后表面弱;在理想形状的划痕截面和表面同时发生内全反射时,平面划痕周围的光强增强效果明显。锥形划痕周围的光强分布为正确解释交叉划痕的夹角平分线附近的损伤提供了理论依据。
The modulation of the light field by the fusion of the surface defects of the fused silica is the main factor leading to the destruction of the laser irradiation field. The finite element method was used to simulate the distribution of light intensity around the sub-surface defects (flat and conical scratches) of fused silica. The results show that scratch shape, geometric size, azimuth angle and incident angle of light are the main factors that affect the light intensity distribution around the scratch. The scratches on the front surface enhance the light intensity less than the back surface. When the total cross-section and surface total internal reflection occurs, the enhancement of the light intensity around the plane scratch is obvious. The distribution of light intensity around the conical scratches provides a theoretical basis for correctly explaining the damage near the bisector of the cross-scratches.