激光驱动准等熵压缩透明窗口LiF的透明性

张志宇; 赵阳; 薛全喜; 王峰; 杨家敏

doi:10.7498/aps.64.205202

摘要

LiF在激光驱动高压实验中是比较常见的窗口材料, 其在冲击下透射或反射可见诊断光是作为窗口材料的重要特性. 在神光III原型激光装置上开展了带LiF窗口的铝样品准等熵压缩实验, 采用任意反射面速度干涉仪诊断获得准等熵压缩样品(CH/Al/LiF)的反射率. 实验结果表明在准等熵压缩后期反射率诊断出现致盲现象. 为此, 建立了带透明窗口的样品对诊断光的反射率模型, 模型考虑了窗口LiF压缩后透明性变化. 模型计算的CH/Al/LiF样品对可见光的反射率时间演化过程与实验结果符合较好. 研究结果表明: LiF中压缩波追赶逐渐形成强冲击波, 显著降低了LiF的透明性, 并最终发生致盲现象; 第一性原理方法所给出的LiF的能带间隙偏低1–2 eV; 该实验中, LiF的透明性完全消失时, LiF中波头处的温度约为1 eV, 压力为2–3 Mbar.

关键词:

准等熵压缩 /
LiF /
能带间隙 /
透明性

Abstract

LiF is often used as a window in laser-driven shock experiments, which can transmit and reflect visible probe laser. Researches of LiF transparency almost focus on its optical reflectivity compressed by strong shock, but there is almost no research on its optical transmissivity compressed by weak shock. In order to study the optical transmissivity of LiF, the quasi-isentropic compression experiment is carried out on the ShenGuang-III prototype laser facility, in which the velocity interferometer system for any reflector is used to diagnose the optical reflectivity of the quasi-isentropic compression sample CH/Al/LiF. The experimental results indicate that the velocity interferometer fringes are missing in the late stage of this experiment. The probe laser should penetrate LiF before it hits the rear surface of aluminum and the laser reflected by aluminum should penetrate LiF before it is collected by the velocity interferometer system for any reflector. Therefore, the reflectivity diagnosed by the velocity interferometer system for any reflector is the product of the optical reflectivity of aluminum and the optical transmissivity of LiF under the experimental condition. However, there is no research about the optical transmissivity model of thick LiF compressed by laser-driven shock. In this paper, we develop a transmissivity model for transparent window LiF and simulate the optical reflectivity of sample CH/Al/LiF. Firstly, we simulate the temperature and density of the sample by the code for one-dimensional multigroup radiation hydrodynamics (MULTI-1D). Then, based on the resulting temperature and density, we simulate the optical reflectivity of the sample by using the optical reflectivity model of aluminum and the optical transmissivity model of LiF. Without considering the transparency of LiF, the simulated result indicates that there is no signal missing in the late stage, which is different from the experimental result. By considering the transparency of LiF, the simulated result is in good agreement with the experimental result. The simulated result indicates that the formation of the strong shock, because of the later shock's catching up with the early one, obviously reduces the optical transparency of LiF and finally causes the velocity interferometer fringes to disappear. The simulated result also indicates that the energy gap of LiF calculated from density-functional theory is 1-2 eV. In this experiment, when LiF becomes opaque, its temperature is 1 eV and its pressure is 2-3 Mbar.

Keywords:

作者及机构信息

1.
中国工程物理研究院激光聚变研究中心, 绵阳 621900;

2.
清华大学工程物理系, 北京 100084;

3.
西北核技术研究所, 激光与物质相互作用国家重点实验室, 西安 710024

基金项目: 国家自然科学基金(批准号: 11304292)和中国工程物理研究院院长基金(批准号: 201402013)资助的课题.

Authors and contacts

1.
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China;

2.
Department of Engineering Physics, Tsinghua University, Beijing 100084, China;

3.
State Key Laboratory of Laser Interaction with Matter, Northwest Institute of Nuclear Technology, Xi'an 710024, China

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11304292) and the Presidential Foundation of China Academy of Engineering Physics, China (Grant No. 201402013).

参考文献

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[20]	Clérouin J, Laudernet Y, Recoules V, Mazevet S 2005 Phys. Rev. B 72 155122
[21]	Sajid A, Murtaza G, Reshak A H 2013 Mod. Phys. Lett. B 27 1350061
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[23]	Wang F, Peng X S, Zhang R, Xu T, Wei H Y, Liu S Y, Wang J J, Li M Z, Jiang X H, Ding Y K 2013 High Power Laser and Particle Beams 25 3158 (in Chinese) [王峰, 彭晓世, 张锐, 徐涛, 魏惠月, 刘慎业, 王建军, 李明中, 蒋小华, 丁永坤 2013 强激光与粒子束 25 3158]
[24]	Benuzzi A, Koenig M, Faral B, Krishnan J, Pisani F, Batani D, Bossi S, Beretta D, Hall T, Ellwi S, Huller S, Honrubia J, Grandjouan N 1998 Phys. Plasmas 5 2410
[25]	Holm B, Ahuja R, Yourdshahyan Y, Johansson B, Lundqvist B I 1999 Phys. Rev. B 59 12777
[26]	Wise J L, Chhabildas L C 1986 Shock Wave in Condensed Matter (edited by GuPta Y M) (New York: Plenum) p441
[27]	Furnish M D, Chhabildas L C, Reinhart W D 1999 Int. J. Impact Eng. 23 261
[28]	LaLone B M, Fat'yanov O V, Asay J R, Gupta Y M 2008 J. Appl. Phys. 103 093505

施引文献

[1]	Loubeyre P, Brygoo S, Eggert J, Celliers P M, Spaulding D K, Rygg J R, Boehly T R, Collins G W, Jeanloz R 2012 Phys. Rev. B 86 144115
[2]	Renaudin P, Blancard C, Clérouin J, Faussurier G, Noiret P, Recoules V 2003 Phys. Rev. Lett. 91 075002
[3]	Bridgman P W 1946 Rev. Mod. Phys. 18 1
[4]	Jing Q M, Wu Q, Liu L, Bi Y, Zhang Y, Liu S G, Xu J A 2012 Chin. Phys. B 21 106201
[5]	Al'Tshuler L V, Bakanova A A, Trunin R F 1962 Sov. Phys. JETP 15 65
[6]	Sun B R, Zhan Z J, Liang B, Zhang R J, Wang W K 2012 Chin. Phys. B 21 056101
[7]	Nellis W J, Moriarty J A, Mitchell A C, Ross M, Dandrea R G, Ashcroft N W, Holmes N C, Gathers G R 1988 Phys. Rev. Lett. 60 1414
[8]	Gu Y, Ni Y L, Wang Y G, Mao C S, Wu F C, Wu J, Zhu J, Wan B G 1988 Acta Phys. Sin. 37 1690 (in Chinese) [顾援, 倪元龙, 王勇刚, 毛楚生, 吴逢春, 吴江, 朱俭, 万炳根 1988 物理学报 37 1690]
[9]	Wang F, Peng X S, Shan L Q, Li M, Xue Q X, Xu T, Wei H Y 2014 Acta Phys. Sin. 63 185202 (in Chinese) [王峰, 彭晓世, 单连强, 李牧, 薛全喜, 徐涛, 魏惠月 2014 物理学报 63 185202]
[10]	Yaakobi B, Boehly T R, Meyerhofer D D, Collins T J B, Remington B A, Allen P G, Pollaine S M, Lorenzana H E, Eggert J H 2005 Phys. Plasmas 12 092703
[11]	Mančić A 2010 J. Phys.: Conf. Ser. 257 012009
[12]	Ping Y, Coppari F, Hicks D G, Yaakobi B, Fratanduono D E, Hamel S, Eggert J H, Rygg J R, Smith R F, Swift D C, Braun D G, Boehly T R, Collins G W 2013 Phys. Rev. Lett. 111 065501
[13]	Barrios M A, Hicks D G, Boehly T R, Fratanduono D E, Eggert J H, Celliers P M, Collins G W, Meyerhofer D D 2010 Phys. Plasmas 17 056307
[14]	Basko M, Löwer T, Kondrashov V N, Kendl A R S, Meyer-ter-Vehn J 1997 Phys. Rev. E 56 1019
[15]	Huser G, Koenig M, Benuzzi-Mounaix A, Henry E, Vinci T, Faral B, Tomasini M, Telaro B, Batani D 2005 Phys. Plasmas 12 060701
[16]	Zhou X M, Wang X S, Li S N, Li J, Li J B, Jing F Q 2007 Acta Phys. Sin. 56 4965 (in Chinese) [周显明, 汪小松, 李赛男, 李俊, 李加波, 经福谦 2007 物理学报 56 4965]
[17]	Knudson M D, Hanson D L, Bailey J E, Hall C A, Asay J R 2003 Phys. Rev. Lett. 90 035505
[18]	Hicks D G, Celliers P M, Collins G W, Eggert J H, Moon S J 2003 Phys. Rev. Lett. 91 035502
[19]	Fratanduono D E, Boehly T R, Barrios M A, Meyerhofer D D, Eggert J H, Smith R F, Hicks D G, Celliers P M, Braun D G, Collins G W 2011 J. Appl. Phys. 109 123521
[20]	Clérouin J, Laudernet Y, Recoules V, Mazevet S 2005 Phys. Rev. B 72 155122
[21]	Sajid A, Murtaza G, Reshak A H 2013 Mod. Phys. Lett. B 27 1350061
[22]	Xue Q, Wang Z, Jiang S, Wang F, Ye X, Liu J 2014 Phys. Plasmas 21 072709
[23]	Wang F, Peng X S, Zhang R, Xu T, Wei H Y, Liu S Y, Wang J J, Li M Z, Jiang X H, Ding Y K 2013 High Power Laser and Particle Beams 25 3158 (in Chinese) [王峰, 彭晓世, 张锐, 徐涛, 魏惠月, 刘慎业, 王建军, 李明中, 蒋小华, 丁永坤 2013 强激光与粒子束 25 3158]
[24]	Benuzzi A, Koenig M, Faral B, Krishnan J, Pisani F, Batani D, Bossi S, Beretta D, Hall T, Ellwi S, Huller S, Honrubia J, Grandjouan N 1998 Phys. Plasmas 5 2410
[25]	Holm B, Ahuja R, Yourdshahyan Y, Johansson B, Lundqvist B I 1999 Phys. Rev. B 59 12777
[26]	Wise J L, Chhabildas L C 1986 Shock Wave in Condensed Matter (edited by GuPta Y M) (New York: Plenum) p441
[27]	Furnish M D, Chhabildas L C, Reinhart W D 1999 Int. J. Impact Eng. 23 261
[28]	LaLone B M, Fat'yanov O V, Asay J R, Gupta Y M 2008 J. Appl. Phys. 103 093505

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