Mitigation of laser damage growth in fused silica by using a non-evaporative technique

doi:10.1088/1674-1056/21/5/054216

中国物理B ›› 2012, Vol. 21 ›› Issue (5): 54216-054216.doi: 10.1088/1674-1056/21/5/054216

Mitigation of laser damage growth in fused silica by using a non-evaporative technique

蒋勇¹ ²,刘春明¹,罗成思¹,袁晓东²,向霞¹,王海军²,贺少勃²,吕海兵²,任玮²,郑万国²,祖小涛¹

1. Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China;
2. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China

收稿日期:2011-09-28 修回日期:2012-04-27 出版日期:2012-04-01 发布日期:2012-04-01
基金资助:
Project supported by the National High Technology Research and Development Program of China (Grant No. 2008AA8040508), Foundation for Young Scholars of University of Electronic Science and Technology of China (Grant No. L08010401JX0806), 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 of China (Grant No. ZYGX2011J043), and the Sichuan Provincial Young Scientists Foundation, China (Grant No. 2010JQ0006).

Mitigation of laser damage growth in fused silica by using a non-evaporative technique

Jiang Yong(蒋勇)^a)b), Liu Chun-Ming(刘春明)^a)†, Luo Cheng-Si(罗成思)^a), Yuan Xiao-Dong(袁晓东)^b), Xiang Xia(向霞)^a), Wang Hai-Jun(王海军)^b), He Shao-Bo(贺少勃)^b), Lü Hai-Bin(吕海兵)^b), Ren Wei (任玮)^b), Zheng Wan-Guo(郑万国)^b), and Zu Xiao-Tao(祖小涛)^a)‡

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:2011-09-28 Revised:2012-04-27 Online:2012-04-01 Published:2012-04-01
Supported by:
Project supported by the National High Technology Research and Development Program of China (Grant No. 2008AA8040508), Foundation for Young Scholars of University of Electronic Science and Technology of China (Grant No. L08010401JX0806), 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 of China (Grant No. ZYGX2011J043), and the Sichuan Provincial Young Scientists Foundation, China (Grant No. 2010JQ0006).

摘要/Abstract

摘要： A non-evaporative technique is used to mitigate damage sites with lateral sizes in a range from 50 μm to 400 μm and depths smaller than 100 μm. The influence of the pulse frequency of a CO₂ laser on the mitigation effect is studied. It is found that a more symmetrical and smooth mitigation crater can be obtained by increasing the laser pulse frequency form 0.1 to 20 kHz. Furthermore, the sizes of laser-affected and distorted zones decrease with the increase of the laser pulse frequency, leading to less degradation of the wave-front quality of the conditioned sample. The energy density of the CO₂ laser beam is introduced for selecting the mitigation parameters. The damage sites can be successfully mitigated by increasing the energy density in a ramped way. Finally, the laser-induced damage threshold (LIDT) of the mitigated site is tested using 355 nm laser beam with a small spot (0.23 mm²) and a large spot (3.14 mm²), separately. It is shown that the non-evaporative mitigation technique is a successful method to stop damage re-initiation since the average LIDTs of mitigated sites tested with small or large laser spots are higher than that of pristine material.

关键词: fused silica, CO₂ laser, non-evaporative technique, energy density

Abstract: A non-evaporative technique is used to mitigate damage sites with lateral sizes in a range from 50 μm to 400 μm and depths smaller than 100 μm. The influence of the pulse frequency of a CO₂ laser on the mitigation effect is studied. It is found that a more symmetrical and smooth mitigation crater can be obtained by increasing the laser pulse frequency form 0.1 to 20 kHz. Furthermore, the sizes of laser-affected and distorted zones decrease with the increase of the laser pulse frequency, leading to less degradation of the wave-front quality of the conditioned sample. The energy density of the CO₂ laser beam is introduced for selecting the mitigation parameters. The damage sites can be successfully mitigated by increasing the energy density in a ramped way. Finally, the laser-induced damage threshold (LIDT) of the mitigated site is tested using 355 nm laser beam with a small spot (0.23 mm²) and a large spot (3.14 mm²), separately. It is shown that the non-evaporative mitigation technique is a successful method to stop damage re-initiation since the average LIDTs of mitigated sites tested with small or large laser spots are higher than that of pristine material.

Key words: fused silica, CO₂ laser, non-evaporative technique, energy density

中图分类号: (Glasses, quartz)

42.70.Ce

61.80.-x (Physical radiation effects, radiation damage) 78.20.-e (Optical properties of bulk materials and thin films) 79.20.Eb (Laser ablation)

蒋勇, 刘春明, 罗成思, 袁晓东, 向霞, 王海军, 贺少勃, 吕海兵, 任玮, 郑万国, 祖小涛. Mitigation of laser damage growth in fused silica by using a non-evaporative technique[J]. 中国物理B, 2012, 21(5): 54216-054216.

Jiang Yong(蒋勇), Liu Chun-Ming(刘春明), Luo Cheng-Si(罗成思), Yuan Xiao-Dong(袁晓东), Xiang Xia(向霞), Wang Hai-Jun(王海军), He Shao-Bo(贺少勃), LüHai-Bin(吕海兵), Ren Wei (任玮), Zheng Wan-Guo(郑万国), and Zu Xiao-Tao(祖小涛) . Mitigation of laser damage growth in fused silica by using a non-evaporative technique[J]. Chin. Phys. B, 2012, 21(5): 54216-054216.

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Mitigation of laser damage growth in fused silica by using a non-evaporative technique

Mitigation of laser damage growth in fused silica by using a non-evaporative technique

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