实验研究了纳秒激光辐照下不同材料的工程陶瓷表面的抗激光损伤能力, 并与不锈钢、铝合金等金属材料进行了对比.结果表明, 不同材料的工程陶瓷表面抗激光损伤特性不同; 氧化铝陶瓷的损伤阈值最高, 氮化硅陶瓷的损伤阈值较低.与金属材料相比较, 工程陶瓷表面损伤阈值比不锈钢和铝合金高.由于材料的熔点和热传导率等热力学特性不同, 不同的陶瓷材料具有不同的损伤阈值和损伤形貌.理论分析了不同材料抗激光损伤阈值的差异; 陶瓷材料的吸收系数远远小于金属材料, 吸收系数通过影响能量沉积区域和有效热扩散速率影响材料温度的演化过程, 最终影响着材料的激光损伤阈值和损伤特性.实验结果为高功率激光装置中对抗激光损伤能力要求较高的机械支撑材料的选择提供了指导.

In order to monitor the volatilization and deposition of organic contaminants on optics surfaces in high power laser facility, online detection of airborne molecular contaminant was investigated based on quartz crystal microbalance and optical microfiber. First, the response performance of quartz crystal microbalance for different densities of airborne molecular contamination was tested. Then the comparison of quartz crystal microbalance and optical microfiber in detecting the surface mass density of airborne molecular contamination was implemented with the view factor method. The characteristics of airborne molecular contamination deposited on optical surface were also studied. The experiment results show that quartz crystal microbalance and optical microfiber have the similar response performance, and thus they can be applied in online airborne molecular contamination detection. When the surface mass density of airborne molecular contamination is larger than 0.5×10－5g/cm2, optical microfiber is preferred due to the higher precision and larger response speed. The more the density of airborne molecular contamination is, the more it deposits on the optics.

In order to monitor the volatilization and deposition of organic contaminants on optics surfaces in high power laser facility, online detection of airborne molecular contaminant was investigated based on quartz crystal microbalance and optical microfiber. First, the response performance of quartz crystal microbalance for different densities of airborne molecular contamination was tested. Then the comparison of quartz crystal microbalance and optical microfiber in detecting the surface mass density of airborne molecular contamination was implemented with the view factor method. The characteristics of airborne molecular contamination deposited on optical surface were also studied. The experiment results show that quartz crystal microbalance and optical microfiber have the similar response performance, and thus they can be applied in online airborne molecular contamination detection. When the surface mass density of airborne molecular contamination is larger than 0.5×10－5g/cm2, optical microfiber is preferred due to the higher precision and larger response speed. The more the density of airborne molecular contamination is, the more it deposits on the optics.

Based on the vibration theory and the matrix optics theory, the principle of the optical image method to test the beam positioning stability is derived. The test method of beam positioning stability is designed, and the experimental results show that the optical image method can accurately analyze the range of the beam positioning stability error, also can analyze the value and influence degree of vibration frequency of the error, and combined with the accelerometer by the electron test method, the source of the error can be detected in the optical system. The optical-electro test method is reliable, simple and convenient, and has good engineering application value, especially for large optical system.

从振动的基本理论出发,应用矩阵光学理论,推导了光学图像法测试光束指向稳定性的原理。设计了光电法测试光束指向稳定性的测试应用,并搭建了实验光路,结果表明:光学图像法可以准确分析光束指向稳定性误差的大小、产生的误差的振动频率及其影响程度,并结合加速度计的电学法测试,可以探测光路中引起光束指向误差的来源。光电法测试结果正确可靠、简单方便,具有较好的工程应用价值,特别适合大型光学系统的光束指向稳定性测试。