光子学报 ›› 2019, Vol. 48 ›› Issue (10): 1030003-1030003.doi: 10.3788/gzxb20194810.1030003

• 光谱学 • 上一篇    下一篇

基于有限元法的激光等离子体诱导玻璃损伤特性研究

于慧波1, 姜越1, 沈雄1, 冯国英1, 郑洲2, 贾曜峰1, 韩敬华1   

  1. 1. 四川大学 电子信息学院 激光微纳工程研究所, 成都 610065;
    2. 中国工程物理研究院化工材料研究所, 四川 绵阳 621900
  • 收稿日期:2019-05-16 出版日期:2019-10-25 发布日期:2019-08-06
  • 通讯作者: 韩敬华(1976-),男,副教授,博士,主要研究方向为激光与物质相互作用.Email:hjh_scu@163.com E-mail:hjh_scu@163.com
  • 作者简介:于慧波(1998-),女,硕士研究生,主要研究方向为激光与物质相互作用.Email:huibo_yu@163.com
  • 基金资助:

    国家自然科学基金(No.u1730141),四川省科技厅重点研发项目(No.2018FZ0032),中国工程物理研究院横向课题(No.HG2018132)

Research on Laser Damage Induced by Laser Plasma Based on Finite Element Method

YU Hui-bo1, JIANG Yue1, SHEN Xiong1, FENG Guo-ying1, ZHENG Zhou2, JIA Yao-feng1, HAN Jing-hua1   

  1. 1. Institute of Laser & Micro/Nano Engineering, College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China;
    2. Institute of Chemical Materials, Chinese Academy of Engineering and Physics, Mianyang, Sichuang 621900, China
  • Received:2019-05-16 Online:2019-10-25 Published:2019-08-06
  • Contact: 2019-08-06 E-mail:hjh_scu@163.com
  • Supported by:

    The National Natural Science Foundation of China (No. u1730141), Key Research and Development Project of Sichuan Science and Technology Department (No. 2018FZ0032),Horizontal Project of China Academy of Engineering Physics (No.HG2018132)

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.

关键词: 熔石英玻璃, 有限元分析, 激光等离子体, 冲击波, 激光诱导损伤

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.

Key words: Fused silica glass, Laser induced damage, Shock wave, Finite element analysis, Laser plasma

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