中国物理B ›› 2012, Vol. 21 ›› Issue (6): 64219-064219.doi: 10.1088/1674-1056/21/6/064219

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

Two localized CO2 laser treatment methods for mitigation of UV damage growth in fused silica

蒋勇a b, 向霞a, 刘春明a, 罗成思a, 王海军b, 袁晓东b, 贺少勃b, 任玮b, 吕海兵b, 郑万国b, 祖小涛a   

  1. a. Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China;
    b. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
  • 收稿日期:2011-08-23 修回日期:2011-09-27 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 Fundamental Research Funds for the Central Universities (Grant No. ZYGX2011J043), the Foundation for Young Scholars of University of Electronic Science and Technology of China (Grant No. 8010401JX0806), and the Young Scientists Foundation of Sichuan Province of China (Grant No. 2010JQ0006).

Two localized CO2 laser treatment methods for mitigation of UV damage growth in fused silica

Jiang Yong(蒋勇)a)b), Xiang Xia(向霞)a)†, Liu Chun-Ming(刘春明)a), Luo Cheng-Si(罗成思)a), Wang Hai-Jun(王海军)b), Yuan Xiao-Dong(袁晓东)b), He Shao-Bo(贺少勃)b), Ren Wei(任玮)b), LŰ Hai-Bing(吕海兵)b), Zheng Wan-Guo(郑万国)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 Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
  • Received:2011-08-23 Revised:2011-09-27 Online:2012-05-01 Published:2012-05-01
  • Contact: Xiang Xia, Zu Xiao-Tao E-mail:xiaxiang@uestc.edu.cn; 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 Fundamental Research Funds for the Central Universities (Grant No. ZYGX2011J043), the Foundation for Young Scholars of University of Electronic Science and Technology of China (Grant No. 8010401JX0806), and the Young Scientists Foundation of Sichuan Province of China (Grant No. 2010JQ0006).

摘要: Two methods: high-power, short-time, single-shot irradiation (Method A) and low-power, long-time, multi-shot irradiation (Method B) are investigated to mitigate the UV damage growth in fused silica by using a 10.6-μm CO2 laser. To verify the mitigation effect of the two methods, the laser induced damage thresholds (LIDTs) of the mitigated sites are tested with a 355-nm, 6.4-ns Nd:YAG laser, and the light modulation of the mitigation sites are tested with a 351-nm continuous Nd:YLF laser. The mitigated damaged sites treated with the two methods have almost the same LIDTs, which can recover to the level of pristine material. Compared with Method A, Method B produces mitigated sites with low crater depth and weak light modulation. In addition, there is no raised rim or re-deposited debris formed around the crater edge for Method B. Theoretical calculation is utilized to evaluate the central temperature of the CO2 laser beam irradiated zone and the radius of the crater. It is indicated that the calculated results are consistent with the experimental results.

关键词: fused silica, CO2 laser mitigation, light modulation, damage threshold

Abstract: Two methods: high-power, short-time, single-shot irradiation (Method A) and low-power, long-time, multi-shot irradiation (Method B) are investigated to mitigate the UV damage growth in fused silica by using a 10.6-μm CO2 laser. To verify the mitigation effect of the two methods, the laser induced damage thresholds (LIDTs) of the mitigated sites are tested with a 355-nm, 6.4-ns Nd:YAG laser, and the light modulation of the mitigation sites are tested with a 351-nm continuous Nd:YLF laser. The mitigated damaged sites treated with the two methods have almost the same LIDTs, which can recover to the level of pristine material. Compared with Method A, Method B produces mitigated sites with low crater depth and weak light modulation. In addition, there is no raised rim or re-deposited debris formed around the crater edge for Method B. Theoretical calculation is utilized to evaluate the central temperature of the CO2 laser beam irradiated zone and the radius of the crater. It is indicated that the calculated results are consistent with the experimental results.

Key words: fused silica, CO2 laser mitigation, light modulation, damage threshold

中图分类号:  (Glasses, quartz)

  • 42.70.Ce
78.20.-e (Optical properties of bulk materials and thin films) 78.20.Bh (Theory, models, and numerical simulation) 79.20.Eb (Laser ablation)