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建立了不同类型熔石英元件损伤修复坑形貌的三维模型,利用标量衍射理论并结合快速傅里叶变换算法研究了在351nm激光辐照下修复坑形貌对光传输的影响规律。研究表明,无论是锥形、抛物形或是高斯形修复坑形貌,均会产生离轴位置的环形光场调制增强区,其环形调制极大值均主要受修复坑深度影响,随着修复坑深度的增大而增大,而其分布位置随着修复坑深度的增加逐渐靠近修复元件后表面,随着修复坑底面半径的增大而远离修复元件后表面;同时,当修复坑深度与底面半径一定时,三类修复坑形貌中以抛物形修复坑形貌最为理想。
A three-dimensional model of damage pit repair topography of different types of fused silica was set up. The influence of the shape of repair pit on the optical transmission under 351nm laser irradiation was studied by scalar diffraction theory and Fast Fourier Transform algorithm. The results show that both the conical, parabolic or Gaussian shape of the repaired pit will produce the annular light field modulated enhancement region off-axis, the ring modulation maximum value is mainly affected by the depth of the repaired pit. With the repair As the pit depth increases, the distribution of the pit depth gradually increases as the depth of the repair pit approaches the back surface of the repair component. As the radius of the bottom of the repair pit increases, the distance from the repair component to the back surface increases. When the bottom radius is certain, the three types of repair pit topography are most ideal for parabolic repair pit topography.