中国物理B ›› 2012, Vol. 21 ›› Issue (6): 64401-064401.doi: 10.1088/1674-1056/21/6/064401

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

High temperature thermal behaviour modeling of large-scale fused silica optics for laser facility

于景侠a, 贺少勃b, 向霞a, 袁晓东b, 郑万国b, 吕海兵b, 祖小涛a   

  1. a. Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China;
    b. Research Centre of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
  • 收稿日期:2011-10-20 修回日期:2011-12-12 出版日期:2012-05-01 发布日期:2012-05-01
  • 基金资助:
    Project supported by the Joint Fund of the National Natural Science Foundation of China and the China Academy of Engineering Physics (Grant No. 11076008), the Foundation for Young Scholars of University of Electronic Science and Technology of China (Grant No. L08010401JX0806), and the Fundamental Research Funds for the Central Universities, China (Grant No. ZYGX2009X007).

High temperature thermal behaviour modeling of large-scale fused silica optics for laser facility

Yu Jing-Xia(于景侠)a), He Shao-Bo(贺少勃)b), Xiang Xia(向霞)a), Yuan Xiao-Dong(袁晓东)b), Zheng Wan-Guo(郑万国) b), LŰ Hai-Bing(吕海兵)b), and Zu Xiao-Tao(祖小涛)a)†   

  1. a. Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China;
    b. Research Centre of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
  • Received:2011-10-20 Revised:2011-12-12 Online:2012-05-01 Published:2012-05-01
  • Contact: Zu Xiao-Tao E-mail:xtzu@uestc.edu.cn
  • Supported by:
    Project supported by the Joint Fund of the National Natural Science Foundation of China and the China Academy of Engineering Physics (Grant No. 11076008), the Foundation for Young Scholars of University of Electronic Science and Technology of China (Grant No. L08010401JX0806), and the Fundamental Research Funds for the Central Universities, China (Grant No. ZYGX2009X007).

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摘要： High temperature annealing is often used for the stress control of optical materials. However, weight and viscosity at high temperature may destroy the surface morphology, especially for the large-scale, thin and heavy optics used for large laser facilities. It is necessary to understand the thermal behaviour and design proper support systems for large-scale optics at high temperature. In this work, three support systems for fused silica optics are designed and simulated with the finite element method. After the analysis of the thermal behaviours of different support systems, some advantages and disadvantages can be revealed. The results show that the support with the optical surface vertical is optimal because both pollution and deformation of optics could be well controlled during annealing at high temperature. Annealing process of the optics irradiated by CO2 laser is also simulated. It can be concluded that high temperature annealing can effectively reduce the residual stress. However, the effects of annealing on surface morphology of the optics are complex. Annealing creep is closely related to the residual stress and strain distribution. In the region with large residual stress, the creep is too large and probably increases the deformation gradient which may affect the laser beam propagation.

关键词: numerical simulation, support systems, large-scale fused silica, high temperature

Abstract: High temperature annealing is often used for the stress control of optical materials. However, weight and viscosity at high temperature may destroy the surface morphology, especially for the large-scale, thin and heavy optics used for large laser facilities. It is necessary to understand the thermal behaviour and design proper support systems for large-scale optics at high temperature. In this work, three support systems for fused silica optics are designed and simulated with the finite element method. After the analysis of the thermal behaviours of different support systems, some advantages and disadvantages can be revealed. The results show that the support with the optical surface vertical is optimal because both pollution and deformation of optics could be well controlled during annealing at high temperature. Annealing process of the optics irradiated by CO2 laser is also simulated. It can be concluded that high temperature annealing can effectively reduce the residual stress. However, the effects of annealing on surface morphology of the optics are complex. Annealing creep is closely related to the residual stress and strain distribution. In the region with large residual stress, the creep is too large and probably increases the deformation gradient which may affect the laser beam propagation.

Key words: numerical simulation, support systems, large-scale fused silica, high temperature

中图分类号:  (Analytical and numerical techniques)

  • 44.05.+e
45.10.-b (Computational methods in classical mechanics) 62.20.-x (Mechanical properties of solids) 81.40.Lm (Deformation, plasticity, and creep)