1 上海理工大学光电信息与计算机工程学院，上海 200093
2 中国科学院上海光学精密机械研究所薄膜实验室，上海 201800
3 中国科学院强上海光学精密机械研究所激光材料重点实验室，上海 201800
4 中国科学院大学材料科学与光电子工程中心，北京 100049
5 国科大杭州高等研究院，浙江 杭州 310024
时间分辨的泵浦探测技术是研究光学元件损伤动态过程的有力手段。基于增强电荷耦合器件（ICCD）的时间分辨泵浦探测技术，对比研究了1064 nm纳秒激光辐照下HfO2/SiO2增透膜膜面处于激光入射面（正向过程）和出射面（反向过程）两种情况下的动态损伤过程。在同一能量密度（52 J/cm2）激光辐照下，正向和反向过程都产生了无膜层剥落的小坑损伤以及伴随膜层剥落的小坑损伤，但反向过程产生的小坑的横向尺寸和深度都比正向的大。有限元分析结果表明正向和反向过程中增透膜内部的基底-膜层界面场强相似，但实际损伤形貌尺寸以及依据冲击波传播速度计算得到的爆炸能量都表明反向过程沉积的能量更大，可见等离子体形成后在后续激光脉冲辐照下的发展过程决定了两种情况下的损伤差异。增透膜损伤的时间分辨研究对其损伤机制分析以及实际应用具有重要意义。
薄膜 增透膜 激光诱导损伤 时间分辨 等离子体 冲击波
1 中国科学院上海光学精密机械研究所薄膜光学实验室，上海 201800
2 中国科学院强激光材料重点实验室，上海 201800
激光系统用薄膜元件既要有优异的光学性能，又要有高的激光诱导损伤阈值（LIDT）。薄膜元件的基底表面上交替沉积有高低折射率材料，通过膜厚、折射率等参数的优化可实现所需的光学性能，但元件中存在的微缺陷（如膜料喷溅缺陷、基底缺陷等）是导致LIDT降低的重要原因。通过精准定位切割、三维重构的方法，表征膜料喷溅和基底抛光产生的微缺陷的形貌结构，并对其激光辐照前后的元素分布进行了分析。研究结果为镀制工艺、基底加工工艺的改进提供了参考。
薄膜 激光损伤 微缺陷 喷溅 基底抛光
1 School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
2 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3 Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, Sichuan , China
We design a novel wireless laser power transmission system in which the process of wireless power transmission to a dynamic target was completed based on the rotation of just one component. The design of this system not only reduces the load-bearing of the gimbal, but also avoids the degradation of beam quality caused by lens vibration when tracking dynamic targets. As a result, this WLPT system has been verified by tracking an unmanned aerial vehicle at 122 m away with an offset distance of ±26.7 mm. We believe this system offers great potential in high-power, long-distance dynamic laser power transmission.We design a novel wireless laser power transmission system in which the process of wireless power transmission to a dynamic target was completed based on the rotation of just one component. The design of this system not only reduces the load-bearing of the gimbal, but also avoids the degradation of beam quality caused by lens vibration when tracking dynamic targets. As a result, this WLPT system has been verified by tracking an unmanned aerial vehicle at 122 m away with an offset distance of ±26.7 mm. We believe this system offers great potential in high-power, long-distance dynamic laser power transmission.
激光与光电子学进展
2022, 59(17): 1736001
