光子学报, 2019, 48 (10): 1030003, 网络出版: 2019-11-14
基于有限元法的激光等离子体诱导玻璃损伤特性研究
Research on Laser Damage Induced by Laser Plasma Based on Finite Element Method
激光诱导损伤 激光等离子体 冲击波 熔石英玻璃 有限元分析 Laser induced damage Laser plasma Shock wave Fused silica glass Finite element analysis
摘要
研究了熔石英玻璃元件在纳秒激光等离子体冲击波作用下的表面和横截面损伤形貌,利用有限元法模拟了冲击波在熔石英玻璃内部的传播规律,并基于冲击波在玻璃内部的应力分布规律分析了损伤形成机理.研究发现:在冲击波作用下,石英玻璃会受到沿波面方向的压应力和沿波面切方向的拉应力,在这两种力的作用下,造成以激光辐照中心的弧状层状断裂和沿径向的断裂;冲击波的反射叠加还会使局部拉应力增大,造成靠近后表面的损伤.有限元法能够直观地分析等离子体冲击波对光学元件的作用,并分析光学元件在等离子体冲击波下的损伤机理.
Abstract
The surface and cross-section damage morphology of fused silica glass elements under the action of nanosecond laser plasma shock waves was investigated. We use the finite element method to simulate the propagation law of shock wave inside fused silica glass, and analyze the damage formation mechanism based on the stress distribution law of shock wave inside glass. It is found that under the action of shock wave, the fused silica glass will be subjected to compressive stress along the wave front direction and tensile stress along the wave front direction. These two stresses cause arc-like layered fracture and radial fracture at the center of the laser irradiation. The superposition of the reflection of the shock wave causes the local tensile stress to increase, which caused damage to the rear surface. Through the finite element method, we intuitively analyzed the effect of plasma shock wave on optical components, and analyzed the damage mechanism of optical components under plasma shock waves.
于慧波, 姜越, 沈雄, 冯国英, 郑洲, 贾曜峰, 韩敬华. 基于有限元法的激光等离子体诱导玻璃损伤特性研究[J]. 光子学报, 2019, 48(10): 1030003. YU Hui-bo, JIANG Yue, SHEN Xiong, FENG Guo-ying, ZHENG Zhou, JIA Yao-feng, HAN Jing-hua. Research on Laser Damage Induced by Laser Plasma Based on Finite Element Method[J]. ACTA PHOTONICA SINICA, 2019, 48(10): 1030003.