熔石英表面加工引入金属微粒的三倍频激光损伤机制
Mechanism of third-harmonic laser-induced damage on fused silica surface with processing-introduced metal absorbers
-
摘要: 以材料表面金属元素吸收作为主线建立熔石英表面损伤模型,理论模拟了激光辐照过程中金属微粒周围温度场的变化,模型结果显示,在脉冲时间内微粒周围温度很快达到损伤判据给出的临界温度。通过激光损伤实验,对比刻蚀与未刻蚀样品之间的损伤密度,证实了金属微粒含量与损伤密度存在密切联系。计算结果和实验结果均表明:金属微粒是熔石英激光损伤中重要的吸收前驱体,极大降低了熔石英材料的表面抗损伤性能。Abstract: A laser-induced damage model has been built for fused silica surface with metal particles as absorbers, which are introduced by processing. The evolution of the temperature field around absorbers during laser irradiation was simulated, and shows that the temperature at the hottest point will soon reach the critical temperature of damage in a pulse time. Damage densities of samples with and without etching have been experimentally compared, revealing the strong correlation between metal particles amount and damage density. Moreover, both simulation and experiment show that, the metal particles in fused silica surface are important damage precursors, which decrease the material’s laser damage threshold.
-
Key words:
- laser-induced damage /
- fused silica /
- third harmonic /
- absorbers
点击查看大图
计量
- 文章访问数: 1924
- HTML全文浏览量: 281
- PDF下载量: 533
- 被引次数: 0