应用于激光陀螺的高反镜在加工安装过程中不可避免地会引入疵病,从而对入射光产生调制作用,引发光散射。为了研究划痕状疵病尺寸发生变化时散射场的变化规律,采用有限元法和多物理场仿真软件建立了高反镜表面截面形状为矩形的单划痕疵病散射模型。通过改变疵病的宽度、深度,分析激光散射场的空间分布变化;用搭建的积分散射测量系统检测不同宽度、深度的疵病,并与仿真结果进行对比。实验结果表明,不同尺寸疵病的散射场变化趋势与仿真结果基本吻合,为高反镜表面疵病的检测工作提供了理论依据和参考。

高反镜通常用于激光陀螺、高能激光系统等**领域，在加工过程中不可避免地引入表面疵病，会破坏高反射膜系甚至基底，严重影响其性能。目前高反射镜表面较为复杂的疵病依然是研究的重点。针对疵病的光散射特性，结合有限元（FEM)对截面为三角形的连续重复型划痕疵病建立电磁仿真模型，研究高斯光束入射时不同尺寸疵病的积分散射光强变化和不同位置处探测空间散射分布的区别，得到疵病散射光强曲线，能够反映出疵病尺寸变化与积分散射分布的关系以及空间散射最佳探测位置。研究结果对高反射镜表面疵病无损探测方法的研究具有一定的理论指导价值。

为了进一步减小白宝石（Al2O3）高反镜在强光辐照下的热变形, 提高光束质量, 研究了白宝石高反镜厚度、直径尺寸对热变形的影响。采用以极坐标表示的热传导方程和热变形公式来描述白宝石高反镜的温度场分布和位移场分布;在有限元分析软件中建立数值计算模型, 并计算了不同厚度、直径尺寸下的温度场和位移场, 得到了热变形随厚度尺寸和直径尺寸变化的规律。结果表明,影响白宝石高反镜反射面峰谷值变化的主要因素是温度, 而尺寸变化对温度和刚度均有影响;选择合适的高反镜直径和厚度尺寸, 可以有效降低镜面温升, 同时得到合适的轴向结构刚度, 从而减小反射镜镜面热变形。该研究结果对强光辐照下白宝石高反镜尺寸设计和选择具有一定的参考价值。

针对激光主动探测系统的主要工作波长为1064nm，提出了一种利用介质膜高反镜实现“猫眼”目标隐身的方案。利用单波长介质膜高反镜的反射率特性，将介质膜高反镜与“猫眼”目标光轴以一定角度装配，推导了加载介质膜高反镜的理想“猫眼”目标回波功率模型，并给出了典型算例。通过实验方法分析了介质膜高反镜的反射率特性，修正了45°激光入射角的平均反射率值。典型“猫眼”目标的外场实验表明，在有限“牺牲”成像质量的前提下，介质膜高反镜可大大降低“猫眼”目标的“猫眼”效应，实现光电装备的有效隐身。

Single-pulse and multi-pulse damage behaviors of "standard" (with \lambda/4 stack structure) and "modified" (with reduced standing-wave field) HfO2/SiO2 mirror coatings are investigated using a commercial 50-fs, 800-nm Ti:sapphire laser system. Precise morphologies of damaged sites display strikingly different features when the samples are subjected to various number of incident pulses, which are explained reasonably by the standing-wave field distribution within the coatings. Meanwhile, the single-pulse laser-induced damage threshold of the "standard" mirror is improved by about 14% while suppressing the normalized electric field intensity at the outmost interface of the HfO2 and SiO2 layers by 37%. To discuss the damage mechanism, a theoretical model based on photoionization, avalanche ionization, and decays of electrons is adopted to simulate the evolution curves of the conduction-band electron density during pulse duration.

P-polarization high reflectors are deposited by e-beam from hafnia and silica. 1-on-1 and N-on-1 tests at 1064-nm wavelength with P-polarization at 45° incidence are carried out on these samples. Microscope and scanning electron microscope are applied to investigate the damage morphologies in both 1-on-1 and N-on-1 tests. It is found that the laser damage threshold is higher in N-on-1 tests and nodular defect is the main inducement that leads to the damage because nodular ejection with plasma scalding is the typical damage morphology. Similar damage morphology observed in the two tests indicates that the higher laser damage threshold in N-on-1 test is attributed to the mechanical stabilization process of nodular defects, owing to the gradually increased laser fluence radiation. Based on the typical morphology study, some process optimizations are given.