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.

考察了利用皮秒激光烧蚀切割K9玻璃过程中后表面的烧蚀损伤现象, 比较了前、后表面的烧蚀特性, 分析了激光能量密度、扫描次数和扫描速度等因素对后表面损伤的影响。根据后表面烧蚀形貌和质量, 优化了激光单行单次扫描时的激光能量密度和扫描速度等参数。讨论了后表面烧蚀损伤的机理, 提出了抑制后表面损伤的方法。实验结果表明, 激光聚焦在前表面进行烧蚀切割时, 后表面会出现严重的烧蚀损伤, 且后表面烧蚀形貌和规律与前表面的显著不同。

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.

研究了表面处理工艺对铝合金表面抗激光损伤能力的影响。结果表明，在相同纳秒激光脉冲辐照下，与机械抛光相比，化学镀镍、阳极氧化黑和硬质阳极氧化处理的表面损伤阈值较低，而钝化和微弧氧化的损伤阈值较高；相同处理工艺但不同参数对应的损伤阈值不同。通过比较不同工艺表面的相关物理参数，对损伤阈值、形貌和规律进行了分析。结果表明，钝化更适用于高功率激光装置中铝合金表面的处理。