KDP晶体相位匹配角理论预测模型及其验证分析

张洋; 李婷; 袁晓东; 熊召; 徐旭; 叶朗; 周海; 张彬

doi:10.7498/aps.64.024213

摘要

在高功率固体激光器的终端光学组件内, 大口径薄型KDP (KH2PO4)晶体的精密装配和校准是实现惯性约束核聚变的关键技术之一. 为了达到晶体在线安装高效高精度的要求, 需要测量高功率激光三次谐波转换效率达到最高时的晶体相位匹配角分布. 本文针对Ⅰ/Ⅱ类大口径薄型KDP晶体三次谐波转换的方式, 根据晶体的非线性光学属性获得了晶体不同位置相位匹配角之间的关系; 根据激光束在晶体内的传输路径分析得到了晶体面形、相位匹配角与激光三次谐波转换效率达到最高时晶体最佳偏转角之间的相互关系. 在此基础上, 建立了Ⅰ/Ⅱ类KDP晶体相位匹配角的理论预测模型, 并利用实验进行了验证和分析. 实验结果表明, 晶体相位匹配角的预测值与实验值之差在10.0 rad以内, 验证了Ⅰ/Ⅱ类KDP晶体相位匹配角理论预测模型的正确性, 为获得晶体全口径相位匹配角分布提供了简单、高效的预测方法.

关键词:

Abstract

In final optics assembly of high-power solid-state laser, in order to improve the third harmonic generation efficiency, the accurate assembly and calibration of ultra-thin KH2PO4 (KDP) crystal with large-aperture is one of the key technologies to realize inertial confinement fusion. In order to meet the requirements for high efficiency and precision crystal of online installation, it is necessary to measure crystalline phase matching angle for achieving the highest third harmonic conversion efficiency of high power laser. In this paper, for the third harmonic conversion by ultra-thin type Ⅰ/Ⅱ KDP crystals with large-aperture, the relationship between phase matching angles at different locations on the crystal is obtained according to the nonlinear optical properties of the crystal. Based on the analysis of the propagation path of the laser beam in the crystal, the relationship among the crystal surface shape, the phase matching angle and the best deflection angle is given. On this basis, the theoretical model for phase-matching angle of type Ⅰ/Ⅱ KDP crystal is proposed, and verified by the experimental results. The results show that the difference in phase matching angle between the prediction values and the experimental results is within 10.0 rad, showing that the theoretical model for phase-matching angles of type Ⅰ/Ⅱ KDP crystals is valid. This model provides a simple and efficient prediction method to obtain the phase matching angle distribution in full aperture of KDP crystal.

Keywords:

作者及机构信息

1.
四川大学电子信息学院, 成都 610065;

2.
中国工程物理研究院激光聚变研究中心, 绵阳 621900

基金项目: 中国工程物理研究院太赫兹科学技术基金(批准号: CAEPTHZ201305)和四川省教育厅创新团队计划(批准号: 13Td0048)资助的课题.

Authors and contacts

1.
College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China;

2.
Research Center of Laser Fusion, China Academy Engineering Physics, Mianyang 621900, China

Funds: Project supported by the Science and Technology Foundation for Terahertz of China Academy of Engineering Physics, China (Grant No. CAEPTHZ201305) and the Program Innovation Team of the Education Department of Sichuan Province, China (Grant No. 13Td0048).

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施引文献

[1]	Zhu S J, Wang S L, Liu L, Wang D L, Li W D, Huang P P, Xu G X 2014 Acta Phys. Sin. 63 107701 (in Chinese) [朱胜军, 王圣来, 刘琳, 王端良, 李伟东, 黄萍萍, 许心光 2014 63 107701]
[2]	Moses E I, Campbell J H, Stolz C J, Wuest C R 2003 Proc. SPIE 5001 1
[3]	Li S W, Song T M, Yi R Q, Cui Y L, Jiang X H, Wang Z B, Yang J M, Jiang S E 2011 Acta Phys. Sin. 60 055207 (in Chinese) [李三伟, 宋天明, 易荣清, 崔延莉, 蒋小华, 王哲斌, 杨家敏, 江少恩 2011 60 055207]
[4]	Mainguy S, Airiau J P, Bart T, Beau V, Bordenave E, Bouillet S, Chappuis C, Chico S, Cormont P, Darbois N, Daurios J, Denis V, Eupherte L, Nathalie F D, Servane F, Gaborit G, Claire G G, Eric J, Laurent L, Thomas L, Eric L, Christophe L, Mangeant M, Maunier C, Néauport J, Etienne P M, Razé G, Claude R, Sajer J M, Seznec S, Taroux D, Vermersch S 2013 Proc. SPIE 8602 86020G
[5]	Ji L L, Zhu B Q, Zhan T Y, Dai Y P, Zhu J, Ma W X, Lin Z Q 2011 Acta Phys. Sin. 60 094210 (in Chinese) [季来林, 朱宝强, 詹廷宇, 戴亚平, 朱检, 马伟新, 林尊琪 2011 60 094210]
[6]	Ma C, Li K, Wang C, Jia H, Feng B, Xiang Y, Zhao C Z, Wang L Q, Huang Z H 2005 Proc. SPIE 5934 59340E
[7]	Yang Y S, Zheng W G, Han W, Che Y L, Tan J C, Xiang Y, Jia H T 2007 Acta Phys. Sin. 56 6468 (in Chinese) [杨义胜, 郑万国, 韩伟, 车雅良, 谭吉春, 向勇, 贾怀庭 2007 56 6468]
[8]	Huang J G, Lu J X, Zhou W, Tong J C, Huang Z M, Chu J H 2013 Acta Phys. Sin. 62 120704 (in Chinese) [黄敬国, 陆金星, 周炜, 童劲超, 黄志明, 褚君浩 2013 62 120704]
[9]	Li Z Y, Bing P B, Xu D G, Cao X L, Yao J Q 2013 Acta Phys. Sin. 62 084212 (in Chinese) [李忠洋, 邴丕彬, 徐德刚, 曹小龙, 姚建铨 2013 62 084212]
[10]	Sharifi S M, Talebpour A, Yang J, Chin S L 2010 Chin. Phys. B 19 155601
[11]	Wang W, Li K Y, Wang J, Han W, Wang F, Xiang Y, Li F Q, Jia H T, Wang L Q, Zhong W, Zhang X M, Zhao S Z, Feng B 2011 Opt. Laser Technol. 43 683
[12]	Zhong H Z, Yuan P, Zhu H Y, Qian L J 2013 Chin. Phys. Lett. 30 014208
[13]	Hibbard R L 1998 1998 Diffractive Optic and Micro Optics Conference Kailua, HI (United States), June 8-12, 1998 130318
[14]	Xu X, Xiong Z, Ye L, Liu C C, Yuan X D, Cao T F, Jia K 2013 High Power Laser and Particle Beams 25 3189 (in Chinese) [徐旭, 熊召, 叶朗, 刘长春, 袁晓东, 曹庭分, 贾凯 2013 强激光与粒子束 25 3189]
[15]	Kong C H 2010 M. S. Thesis (Mianyang: China Academy of Engineering Physics) (in Chinese) [孔晨晖 2010 硕士学位论文 (绵阳: 中国工程物理研究院)]
[16]	Wegner P J, Auerbach J M, Barker C E, Burkhart S C, Couture S A, DeYoreo J J, Hibbard R L, Liou L W, Norton M A, Whitman P K, Hackel L A 1999 Proc. SPIE 3492 392
[17]	Lubin O, Gouedard C 1999 Proc. SPIE 3492 802
[18]	Ott J H, Sliker T R 1964 JOSA 54 1442

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