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当前高功率激光装置系统中, 国内使用透射式衍射光栅进行光束采样, 国外甚至使用光栅聚焦并同时结合谐波分离和采样功能. 高功率激光辐照下, 除了0级透射打靶光以及目标取样光外, 其他级次衍射光的影响也不可忽视, 可能造成诸如鬼像聚焦破坏、时间脉宽测量不稳定、近远场测量噪声等问题. 尤其是透射衍射光栅内部全反射级次会导致光栅出射一系列规律的衍射花样, 造成上述干扰和危害. 首先理论上针对透射式光栅(包括取样光栅和聚焦光栅)进行了相应的计算和分析, 然后从实验上观察并测量了取样光栅内部全反射级次的现象, 并且结合镀减反膜前后的衍射现象进行了讨论, 最后分析并给出了如何消除或规避全反射级次和其他冗余级次影响的方法.In a current high-power laser system, transmission grating has been used to sample, separate and focus laser beam. Under high power laser irradiation, besides the 0-order shooting beam and target sampling beam, the detrimental influence of other diffraction orders should be taken into consideration seriously. These useless orders may damage other nearby optical elements and mechanical devices, disturb and confuse the measurement of time pulse and near/far-field intensity. Especially the total internal diffraction order will lead to some series diffraction patterns, causing the above problems. First, relevant theoretical calculation and analysis are carried out for transmission grating (including beam sample grating and focusing grating), which can predict and indicate these inconspicuous diffraction orders. These orders appear on four receiving screens regularly and periodically, and the periodic distance between them is determined by ray-tracing draft. Second, the phenomenon of total internal reflection order is observed and measured by combining with anti-reflection film. The measured periodic spacings on three screens are 24 mm, 26 mm and 35 mm, respectively. Moreover, energy intensities of these redundant orders are measured finely, which shows that their contrasts or SNRs to 0-order main laser is in a range of 10-8-10-4). Finally, some appropriate and effective approaches to eliminating or avoiding total internal reflection and other useless orders are proposed and discussed, which include 1) coating by anti-reflection film with pre-deep etching; 2) optimizing the grating design to make redundant orders far from target spot; 3) placing laser scattering or absorbing devices at corresponding position to avoid being damaged by the side-leakage energy and ghost image of total internal reflection and other redundant orders.
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Keywords:
- diffraction grating /
- total internal reflection /
- beam sampling grating /
- ghost image
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[20] Shan W L, Zhu T, Xiong G, Zhao Y, Zhang W H, Yi R Q, Kuang L Y, Cao L F, Gao Y L, Yang J M, Zhao Y D, Cui M Q, Zheng L, Han Y, Zhou K J, Ma C Y 2011 Acta Phys. Sin. 60 034216
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[22] Gao F H 2003 Ph. D. Dissertation (Chengdu: Sichuan University) (in Chinese) [高福华 2003 博士学位论文 (成都: 四川大学)]
[23] Liu Q, Wu J H 2007 High Power Laser and Particle Beams 19 75 (in Chinese) [刘全, 吴建宏 2007 强激光与粒子束 19 75]
[24] Cavailler C, Fleurot N, Di-nicola J M 2005 Proc. SPIE 5580 443
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[1] Liu Q, Wu J H, Li C M 2005 Laser Technol. 29 398 (in Chinese) [刘全, 吴建宏, 李朝明 2005 激光技术 29 398]
[2] Chen D W 2006 Laser J. 27 28 (in Chinese) [陈德伟 2006 激光杂志 27 28]
[3] Luce J 2011 Proc. SPIE 8130 813002
[4] Liu H F 2006 M. S. Dissertation (Hangzhou: Zhejiang University) (in Chinese) [留浩飞 2006 硕士学位论文 (杭州: 浙江大学)]
[5] Liu H J, Liu L Q, Su J Q, Hu D X, Zhou W, Zhao J P, Wang W Y, Mo L, Jiang X Y, Jiang X J, Zhang K, Zhu Q H, Yu H W, Jing F 2008 Acta Opt. Sin. 28 976 (in Chinese) [刘红婕, 刘兰琴, 粟敬钦, 胡东霞, 周维, 赵军普, 王文义, 莫磊, 蒋新颖, 蒋学军, 张昆, 朱启华, 於海武, 景峰 2008光学学报 28 976]
[6] Li L F 1996 J. Opt. Soc. Am. A 13 1870
[7] Li L F 1997 J. Opt. Soc. Am. A 14 2758
[8] Bay anheshig 2004 Ph. D. Dissertation (Changchun: Changchun Institute of Optics, Fine Mechanics and Physics) (in Chinese) [巴音贺希格2004 博士学位论文 (长春: 长春光机所)]
[9] Wang X D, Wang X, He Y L, Zheng H B, Tan J C, Ding D Y, Zheng G W 2010 Chin. Phys. B 19 074215
[10] Liu Y D, Gao C Q, Gao M W 2008 Chin. Phys. B 17 1769
[11] Fu K X, Wang Z H, Wen J, Zhou C H 1998 Acta Opt. Sin. 18 870 (in Chinese) [傅克祥, 王植恒, 文军, 周传宏 1998 光学学报 18 870]
[12] Fu K X, Zhang D Y, Wang Z H, Zhang Q Z, Zhang J 1998 Acta Phys. Sin. 47 1278 (in Chinese) [傅克祥, 张大跃, 王植恒, 张奇志, 张靖 1998 47 1278]
[13] Wang Z H, Fu K X, Wen J, Yuan J H 1998 Chin. J. Lasers A25 270 (in Chinese) [王植恒, 傅克祥, 文军, 袁景和 1998 中国激光 A25 270]
[14] Zhao D F, Wang L, Lin Z Q, Shao P, Ji L L, Cai Z J, Wu R, Dai Y P, Zhu J Q 2011 Chin. J. Lasers 38 0702001 (in Chinese) [赵东峰, 王利, 林尊琪, 邵平, 季来林, 蔡志坚, 邬融, 戴亚平, 朱健强 2011 中国激光 38 0702001]
[15] Rao H L 2013 Ph. D. Dissertation (Hefei: University of Science and Technology of China) (in Chinese) [饶欢乐 2013 博士学位论文 (合肥: 中国科学技术大学)]
[16] Rao H L, Liu Z K, Liu Y, Jiang X L, Qiu K Q, Xu X D, Hong Y L, Fu S J 2013 High Power Laser and Particle Beams 25 1609 (in Chinese) [饶欢乐, 刘正坤, 刘颖, 蒋晓龙, 邱克强, 徐向东, 洪义麟, 付绍军 2013 强激光与粒子束 25 1609]
[17] Anheshig B, Qi X D, Tang Y G 2003 J. Optoelectron. Laser 14 1021 (in Chinese) [巴音贺希格, 齐向东, 唐玉国 2003 光电子·$激光 14 1021]
[18] Fu K X, Wang Z H, Zhang D Y, Wen J, Tang J 1997 Acta Opt. Sin. 17 1652 (in Chinese) [傅克祥, 王植恒, 张大跃, 文军, 唐晋 1997 光学学报 17 1652]
[19] Shan W L, Yang J M, Zhao Y, Zhu T, Xiong G 2011 Acta Phys. Sin. 60 094212 (in Chinese) [尚万里, 杨家敏, 赵阳, 朱托, 熊刚 2011 60 094212]
[20] Shan W L, Zhu T, Xiong G, Zhao Y, Zhang W H, Yi R Q, Kuang L Y, Cao L F, Gao Y L, Yang J M, Zhao Y D, Cui M Q, Zheng L, Han Y, Zhou K J, Ma C Y 2011 Acta Phys. Sin. 60 034216
[21] Chai L Q, Yang L M, Xu Q 2002 High Power Laser and Particle Beams 14 270 (in Chinese) [柴立群, 杨李茗, 许乔 2002 强激光与粒子束 14 270]
[22] Gao F H 2003 Ph. D. Dissertation (Chengdu: Sichuan University) (in Chinese) [高福华 2003 博士学位论文 (成都: 四川大学)]
[23] Liu Q, Wu J H 2007 High Power Laser and Particle Beams 19 75 (in Chinese) [刘全, 吴建宏 2007 强激光与粒子束 19 75]
[24] Cavailler C, Fleurot N, Di-nicola J M 2005 Proc. SPIE 5580 443
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