Evolution of explosion plume on the rear surface of silica elements in nanosecond laser damaging
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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。Abstract: 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.
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Key words:
- optical elements damage /
- fused silica /
- explosion plume /
- particle jet /
- damage dynamics
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图 1 双波长干涉实验光路
Figure 1. Schematic of interference imaging system with dual-wavelength probes
BS, beam splitter; HR, reflector; SP, beam sampler; CS, color separator; PD, photon detector; EM, energy meter; NBF, narrow band filter; MS, microscope; FL, focus lens
图 2 干涉图像获取流场信息提取流程
Figure 2. Extraction processing of phase shift information of interference image
图 3 喷溅颗粒收集设置示意图及喷溅颗粒流的典型图像
Figure 3. Schematic of ejected particle collecting setup and typical image of the particle jets
图 5 后表面不同位置处的双波长探针相位偏移横向分布
Figure 5. Lateral distribution of phase shift of dual-wavelength probe at different position from rear surface inside damage plume
图 7 熔石英后表面紫外损伤的颗粒喷溅物的SEM图像
Figure 7. SEM images of particle ejection generated by UV laser induced rear surface damage of fused silica
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