Influence mechanism of atmosphere on the damage threshold induced by ultraviolet laser in vacuum window
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摘要: 基于氟橡胶圈密封测试了熔石英真空窗口在351 nm激光辐照下的激光诱导损伤阈值（LIDT），实验发现真空窗口和氟橡胶圈紧密接触后LIDT下降约50%，氟橡胶圈经多次挤压后，其对真空窗口LIDT的影响显著减弱，在此基础上对比了大气、103 Pa和10−2～10−1 Pa下真空窗口的LIDT，结果显示随着气压降低真空窗口LIDT显著下降且气压再次升高后其LIDT未有提升。基于铟丝密封对比测试了真空窗口在不同气压下的LIDT，结果未发现气体含量差异对真空窗口LIDT的影响。对比两种密封材料测试结果，认为真空窗口LIDT下降是由氟橡胶圈污染引起，且低气压下有机物释放加剧。Abstract: Vacuum window (VW) damage is the bottleneck restricting the load capacity of high-power laser device, and the influence of vacuum environment is worthy of attention. Firstly, based on the fluororubber ring seal, the laser-induced damage threshold (LIDT) of fused silica VW irradiated by the 351 nm laser was measured. It is found that the LIDT of the VW decreases by about 50% after the close contact with the fluororubber ring. After repeated extrusion, the influence of the fluororubber ring on the LIDT of the VW is significantly weakened. On this basis, the LIDTs of the VW under atmosphere, 103 Pa and 10−2～10−1 Pa are compared. The results show that the LIDT of vacuum window decreases significantly with the decrease of air pressure, and the LIDT does not increase after the air pressure rises again. In addition, the LIDT of the VW under different air pressure is tested based on indium ring sealing, while the effect of air pressure difference on the LIDT is not found. Comparing the results of the two sealing materials, it is considered that the LIDT decreasing of the VW is mainly caused by the release of organic contamination from fluororubber ring and the release of organic matter will be intensified under low pressure.
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Key words:
- atmosphere environment /
- vacuum window /
- laser-induced damage threshold /
- organic contamination /
- 351 nm
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图 1 真空窗口LIDT测试装置示意图
Figure 1. Schematic diagram of experimental setup for the VW LIDT test
图 4 橡胶圈密封过程对6#样片LIDT的影响
Figure 4. Influence of rubber ring sealing process on LIDT of 6# sample
图 5 橡胶圈密封时样片在不同气压下的LIDT
Figure 5. LIDT of samples under different air pressure when rubber ring is sealed
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[1] Spaeth M L, Manes K R, Kalantar D H, et al. Description of the NIF Laser[J]. Fusion Science and Technology, 2016, 69(1): 25-145. doi: 10.13182/FST15-144 [2] Carr C W, Bude J, Miller P E, et al. Damage sources for the NIF Grating Debris Shield (GDS) and methods for their mitigation[C]//Proceedings of SPIE 10447, Laser-Induced Damage in Optical Materials 2017. 2017: 1044702. [3] Liao Z M, Carr C W, Cross D, et al. Damage performance of fused silica debris shield at the National Ignition Facility[C]//Proceedings of SPIE 11173, Laser-induced Damage in Optical Materials 2019. 2019: 111730Y. [4] Chai Xiangxu, Li Ping, Zhao Junpu, et al. Laser-induced damage growth of large-aperture fused silica optics under high-fluence 351 nm laser irradiation[J]. Optik, 2021, 226: 165549. [5] Gingreau C, Lanternier T, Lamaignère L, et al. Impact of mechanical stress induced in silica vacuum windows on laser-induced damage[J]. Optics Letters, 2018, 43(8): 1706-1709. doi: 10.1364/OL.43.001706 [6] 徐世珍, 郑万国, 孙久勋, 等. 环境气氛压强对熔石英紫外激光损伤阈值的影响[J]. 强激光与粒子束, 2008, 20(10):1649-1652Xu Shizhen, Zheng Wanguo, Sun Jiuxun, et al. Effect of gas atmosphere and pressure on 351 nm laser-induced damage threshold of fused silica[J]. High Power Laser and Particle Beams, 2008, 20(10): 1649-1652 [7] Demos S G, Burnham A, Wegner P, et al. Surface defect generation in optical materials under high fluence laser irradiation in vacuum[J]. Electronics Letters, 2000, 36(6): 566-567. doi: 10.1049/el:20000419 [8] 黄进, 周信达, 周晓燕, 等. 真空紫外激光辐照对熔石英表面氧空位的影响[J]. 真空科学与技术学报, 2014, 34(12):1393-1398 doi: 10.13922/j.cnki.cjovst.2014.12.20Huang Jin, Zhou Xinda, Zhou Xiaoyan, et al. Oxygen-deficiency of fused silica surfaces induced by ultra violet pulsed laser irradiation in high vacuum[J]. Chinese Journal of Vacuum Science and Technology, 2014, 34(12): 1393-1398 doi: 10.13922/j.cnki.cjovst.2014.12.20 [9] 夏莉, 李蔚. 低温容器材料在真空状态下放气率的研究进展[J]. 制冷与空调, 2016, 30(5):595-598Xia Li, Li Wei. Review of outgassing rate of the cryogenics-vessel material in vacuum[J]. Refrigeration and Air Conditioning, 2016, 30(5): 595-598 [10] 苗心向, 袁晓东, 吕海兵, 等. 激光装置污染物诱导光学元件表面损伤实验研究[J]. 中国激光, 2015, 42:0602001 doi: 10.3788/CJL201542.0602001Miao Xinxiang, Yuan Xiaodong, Lü Haibing, et al. Experimental study of laser-induced damage of optical components surface owing to particle contamination in high power laser facility[J]. Chinese Journal of Lasers, 2015, 42: 0602001 doi: 10.3788/CJL201542.0602001 [11] Liu Taixiang, Yang Ke, Zhang Zhuo, et al. Hydrofluoric acid-based etching effect on surface pit, crack, and scratch and laser damage site of fused silica optics[J]. Optics Express, 2019, 27(8): 10705-10728. doi: 10.1364/OE.27.010705 [12] 苗心向, 袁晓东, 吕海兵. 基于微纳光纤的气溶胶探测应用技术[J]. 强激光与粒子束, 2014, 26:114103 doi: 10.11884/HPLPB201426.114103Miao Xinxiang, Yuan Xiaodong, Lü Haibing. Contamination particles sensor based on microfiber[J]. High Power Laser and Particle Beams, 2014, 26: 114103 doi: 10.11884/HPLPB201426.114103 [13] Bude J, Miller P, Baxamusa S, et al. High fluence laser damage precursors and their mitigation in fused silica[J]. Optics Express, 2014, 22(5): 5839-5851. doi: 10.1364/OE.22.005839 [14] 于宏伟, 张蕊, 戎媛, 等. 氟橡胶结构及热稳定性研究[J]. 特种橡胶制品, 2020, 41(5):59-64 doi: 10.16574/j.cnki.issn1005-4030.2020.05.014Yu Hongwei, Zhang Rui, Rong Yuan, et al. Structure and thermal stability of fluororubber[J]. Special Purpose Rubber Products, 2020, 41(5): 59-64 doi: 10.16574/j.cnki.issn1005-4030.2020.05.014 [15] 刘玉魁, 杨建斌, 肖详正. 真空工程设计[M]. 北京: 化学工业出版社, 2016Liu Yukui, Yang Jianbin, Xiao Xiangzheng. Design of vacuum engineering[M]. Beijing: Chemical Industry Press, 2016 [16] Boling N L, Crisp M D, Dubé G. Laser induced surface damage[J]. Applied Optics, 1973, 12(4): 650-660. doi: 10.1364/AO.12.000650 [17] 冯焱, 董猛, 成永军. 橡胶材料在真空环境下的放气性能研究[C]//中国真空学会2014学术年会论文摘要集. 2014: 129-134Feng Yan, Dong Meng, Cheng Yongjun. Investigation of outgassing characteristic for synthetic rubber materials[C]//Proceedings of 2014 Academic Annual Meeting of the Chinese Vacuum Society. 2014: 129-134 -
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