论文部分内容阅读
用3维时域有限差分方法分别研究了在355 nm入射激光作用下,熔石英后表面具有不同形状和位置的断点划痕对场分布的影响.研究表明,对于椭圆状的坑点,当共线的轴长逐渐增大时,电场幅值与强点数目先增大后减小,获得最大光强增强因子的两轴比是1.1—1.2,此时坑点呈近圆形.当平行的轴长逐步增大时,电场幅值先逐渐增大,当两轴比为0.53时趋于平缓,而强点总数则呈“J”形曲线不断增长.当坑点尺寸相同但排放位置不同时,相邻坑点的相对面积愈大,调制愈强.
The effect of the breakpoint scratch on the field distribution of the rear surface of fused silica at 355 nm incident laser was studied by means of three-dimensional finite difference time-domain method. The results show that for elliptical pit, When the collinear axis length increases, the amplitude and the number of strong points of the electric field first increase and then decrease, and the two-axis ratio of the maximum light intensity enhancement factor is 1.1-1.2 and the pit point is nearly circular. When the axial length increases, the amplitude of electric field first increases gradually, and tends to be gentle when the ratio of two axes is 0.53, while the total number of strong points increases continuously. When the pit size is the same but the emission position Not at the same time, the larger the relative area of adjacent pits, the stronger the modulation.