纳秒激光诱导光学元件后表面损伤过程中的爆炸流场及喷溅行为  

Evolution of explosion plume on the rear surface of silica elements in nanosecond laser damaging

作　　者：远航 梁凌熙 李宇芯 淡自强 朱成禹[1] Yuan Hang;Liang Lingxi;Li Yuxin;Dan Ziqiang;Zhu Chengyu(Key Laboratory of Tunable Laser,Harbin Institute of Technology,Harbin 150001,China;Laser Fusion Research Center,CAEP,Mianyang 621900,China)

机构地区：[1]哈尔滨工业大学可调谐激光重点实验室,哈尔滨150001 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2023年第6期11-19,共9页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(61905052)。

摘　　要：紫外光学元件损伤动力学的研究是关联物质微观结构演化与光学元件宏观性质变化的重要纽带。在光学元件后表面损伤坑形成的过程中,激光能量沉积导致材料爆炸形成高温高压物质突破表面,并伴随形成爆炸流场和喷溅射流。爆炸流场与初始起爆强度具有强关联性,对爆炸流场及喷溅行为进行研究,可以帮助分析损伤初期的材料状态变化和响应机制,是损伤动力学研究的必需环节。基于多种时间分辨成像技术,捕获了损伤发展前期的材料电离和气化响应演化行为,分析了材料损伤起爆后气化电离等过程的弛豫时间,并确定各个行为转化的关键时间节点,描述了损伤区域能量快速释放的物理过程。The study of UV laser induced damage dynamics is the key to exploring correlating evolution of optical elements’microstructure and macroscopic properties.In optical elements damage process on the rear surface,the laser energy deposition causes the material to explode with high pressure and high temperature to break through the rear surface,and it is accompanied with explosion plume and jet particles.The explosion plume is greatly affected by the initial laser energy deposition.The study of the explosion plume can help a lot in analyzing the material state change and response mechanism at the initial stage of damage.In this paper,explosion plume on the rear surface is investigated using a two-color interferometric time-resolved side-viewed imaging system.Assisted with the observation of the collected ejection,the material species,distributions and thermodynamic behaviors of ejections are presented.Based on findings,the key transition nodes of the response behaviors during laser induced damage formation are captured and the temporal evolvement of plume is described.

关 键 词：光学元件损伤 熔石英 爆炸流场 喷溅射流 损伤动力学 

分 类 号：O436[机械工程—光学工程]