Spectral structures of backward stimulated Brillouin scattering driven by a picosecond laser

Wang Chen; An Hong-Hai; Xiong Jun; Fang Zhi-Heng; Ji Yu; Lian Chang-Wang; Xie Zhi-Yong; Guo Er-Fu; He Zhi-Yu; Cao Zhao-Dong; Wang Wei; Yan Rui; Pei Wen-Bing

doi:10.7498/aps.70.20210568

Abstract

Laser plasma interaction (LPI) is an important content in laser plasma related research, and it is one of the key issues related to the success or failure of inertial confinement fusion ignition, and has received extensive attention. In order to suppress the relevant LPI process as much as possible, the major laboratories around the world have developed a variety of beam smoothing methods through decades of research. However, the current understanding and suppression of LPI are still far from enough, and further in-depth studies are still needed. Generally, the research of LPI is based on nanosecond laser driving, and focuses mainly on the effects of the related LPI process caused by nanosecond lasers. However, the LPI processes, such as stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS), etc., occur and develop on a time scale of picoseconds.The comprehensive effect can be studied only on a longer scale of nanosecond. For highly nonlinear LPI processes, the comprehensive effect may be difficult to reflect the real physical laws. The emergence of the picosecond laser has made it possible to study the LPI process in more detail and on a more appropriate time scale. The present research tries to gain an understanding of LPI from a more refined perspective. The experimental research of picosecond laser driving LPI is carried out on the Shenguang-Ⅱ upgrade and picosecond laser facilities. First, a nanosecond laser is used to irradiate a target to generate a large-scale plasma, and a few nanoseconds later, the picosecond laser is injected as an interaction beam to drive the LPI scattering such as SBS and SRS. The spectral signal of backscatter light is measured experimentally by using the method of diffuse reflector. From the research results it is found that the backward signals of the band near the laser wavelength contain, in addition to the true backward SBS component, a large number of interference signals introduced by picosecond laser and nanosecond laser. The interference signal introduced by nanosecond laser can be eliminated by using specific measures, but the interference signal introduced by picosecond laser cannot be eliminated experimentally, which will affect the estimation of the true share of the backward SBS. The comprehensive results show that under different experimental conditions, the backward scatter energy of SBS may be less than half that of the total recorded signals. This result is helpful in further understanding and re-recognizing previous relevant experimental data.

Keywords:

Authors and contacts

1.
Shanghai Institute of Laser Plasma, China Academy of Engineering Physics, Shanghai 201800, China
2.
Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, China

Corresponding author: Fang Zhi-Heng, 48224947@qq.com

Funds: Project supported by the Science Challenge Project of China (Grant No. TZ2016005)

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References

[1]	Lindl J, Amendt P, Berger R L, Glendinning S G, Glenzer S H, Haan S W, Kauffman R L, Landen O L, Suter L J 2004 Phys. Plasmas 11 339 Google Scholar
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Cited By

图 1 皮秒激光驱动的背向SBS测量方案示意图

Figure 1. Schematic diagram of backward SBS measurement scheme driven by a picosecond laser.

DownLoad: Full-Size Img PowerPoint

图 2 实验用靶　(a)三明治结构; (b)光路示意图; (c)焦斑示意图

Figure 2. Schematic diagram of experimental targets: (a) Sandwich structure; (b) target and driving laser; (c) focal spots of lasers.

DownLoad: Full-Size Img PowerPoint

图 3 皮秒激光诱发的背向SBS光谱

Figure 3. Integrated spectroscopy of backward SBS induced by a picosecond laser.

DownLoad: Full-Size Img PowerPoint

图 4 背向SBS光谱的成分分解　(a)分解为三部分; (b)三部分之和与实验数据比较

Figure 4. Component decomposition of backward SBS spectrum: (a) Decomposed into three parts; (b) sum of the three parts and the experimental data.

DownLoad: Full-Size Img PowerPoint

图 5 靶室内激光光束分布示意图　(a)侧视图; (b)俯视图

Figure 5. Schematic diagram of laser beam distribution in the target chamber: (a) Side view; (b) top view.

DownLoad: Full-Size Img PowerPoint

图 6 利用第2路作为纳秒激光驱动的背向SBS光谱及成分分解

Figure 6. Component decomposition of backward SBS spectrum driven by 2# nanosecond laser.

DownLoad: Full-Size Img PowerPoint

图 7 经过能量归一化的光谱, 分别利用2#和5#纳秒激光

Figure 7. Energy normalized spectra driven by 2# and 5# nanosecond laser respectively.

DownLoad: Full-Size Img PowerPoint

表 1 图4中各部分高斯拟合曲线参数

Table 1. Gaussian fitting curve parameters of each part in Fig.4.

峰值高度中心波长半高全宽
a/count x₀/nm τ/nm

P₁ 1976 1053.4 0.39
P₂ 2101 1053.3 4.4
P₃ 7243 1050.2 1.3

DownLoad: CSV

表 2 针对图6第2路纳秒激光实验的各部分高斯拟合曲线参数

Table 2. Gaussian fitting curve parameters of each part using 2# nanosecond laser shown in Fig.6.

峰值高度中心波长半高全宽
a/count x₀/nm τ/nm

P₁ // // //
P₂ 2994 1053.2 4.3
P₃ 5999 1050.1 1.4

DownLoad: CSV

[1]	Lindl J, Amendt P, Berger R L, Glendinning S G, Glenzer S H, Haan S W, Kauffman R L, Landen O L, Suter L J 2004 Phys. Plasmas 11 339 Google Scholar
[2]	Lindl J, Landen O, Edwards J, Moses E, Team N I C 2014 Phys. Plasmas 21 020501 Google Scholar
[3]	Cavailler C 2005 Plasma Phys. Controlled Fusion 47 B389 Google Scholar
[4]	Craxton R S, Anderson K S, Boehly T R, Goncharov V N, Harding D R, Knauer J P, McCrory R L, McKenty P W, Meyerhofer D D, Myatt J F, Schmitt A J, Sethian J D, Short R W, Skupsky S, Theobald W, Kruer W L, Tanaka K, Betti R, Collins T J B, Delettrez J A, Hu S X, Marozas J A, Maximov A V, Michel D T, Radha P B, Regan S P, Sangster T C, Seka W, Solodov A A, Soures J M, Stoeckl C, Zuegel J D 2015 Phys. Plasmas 22 110501 Google Scholar
[5]	Hao L, Yan R, Li J, Liu W D, Ren C 2017 Phys. Plasmas 24 062709 Google Scholar
[6]	Seaton A G, Arber T D 2020 Phys. Plasmas 27 082704 Google Scholar
[7]	MacGowan B J, Afeyan B B, Back C A, Berger R L, Bonnaud G, Casanova M, Cohen B I, Desenne D E, DuBois D F, Dulieu A G, Estabrook K G, Fernandez J C, Glenzer S H, Hinkel D E, Kaiser T B, Kalantar D H, Kauffman R L, Kirkwood R K, Kruer W L, Langdon A B, Lasinski B F, Montgomery D S, Moody J D, Munro D H, Powers L V, Rose H A, Rousseaux C, Turner R E, Wilde B H, Wilks S C, Williams E A 1996 Phys. Plasmas 3 2029 Google Scholar
[8]	Maximov V, Myatt J, Seka W, Short R W, Craxton R S 2004 Phys. Plasmas 11 2994 Google Scholar
[9]	刘占军, 郝亮, 项江, 郑春阳 2012 物理学报 61 115202 Google Scholar Liu Z J, Hao L, Xiang J, Zheng C Y 2012 Acta Phys. Sin 61 115202 Google Scholar
[10]	Kirkwood R K, Moody J D, Kline J, Dewald E, Glenzer S, Divol L, Michel P, Hinkel D, Berger R, Williams E, Milovich J, Yin L, Rose H, MacGowan B, Landen O, Rosen M, Lindl J 2013 Plasma Phys. Controlled Fusion 55 103001 Google Scholar
[11]	Zhao Y, Yu L L, Zheng J, Weng S M, Ren C, Liu C S, Sheng Z M 2015 Phys. Plasmas 22 052119 Google Scholar
[12]	Duluc M, Penninckx D, Loiseau P, Riazuelo G, Bourgeade A, Chatagnier A, D’humieres E 2019 Phys. Plasmas 26 042707 Google Scholar
[13]	Zhao Y, Sheng Z M, Weng S M, Ji S Z, Zhu J Q 2019 High Power Laser Sci. Eng. 7 e20 Google Scholar
[14]	Ji Y, Lian C W, Yan R, Ren C, Yang D, Wan Z H, Zhao B, Wang C, Fang Z H, Zheng J 2021 Matter Radiat. Extremes 6 015901 Google Scholar
[15]	Strickland D, Mourou G 1985 Opt. Commun. 56 219 Google Scholar
[16]	Danson C, Hillier D, Hopps N, Neely D 2015 High Power Laser Sci. Eng. 3 e3 Google Scholar
[17]	Baldis H A, Villeneuve D M, Fontaine B L, Enright G D, Labaune C, Baton S, Mounaix Ph, Pesme D, Casanova M, Rozmus W 1993 Phys. Fluids B 5 3319 Google Scholar
[18]	Baton S D, Rousseaux C, Mounaix P H, Labaune C, Fontaine B La, Pesme D, Renard N, Gary S, Louis-Jacquet M, Baldis H A 1994 Phys. Rev. E 49 R3602 Google Scholar
[19]	Rousseaux C, Malka G, Miquel J L, Amiranoff F, Baton S D, Mounaix Ph 1995 Phys. Rev. Lett. 74 4655 Google Scholar
[20]	Rousseaux C, Gremillet L, Casanova M, Loiseau P, Rabec Le Gloahec M, Baton S D, Amiranoff F, Adam J C, Héron A 2006 Phys. Rev. Lett. 97 015001 Google Scholar
[21]	Rousseaux C, Glize K, Baton S D, Lancia L, Bénisti D, Gremillet L 2016 Phys. Rev. Lett. 117 015002 Google Scholar
[22]	Rousseaux C, Baton S D, Bénisti D, Gremillet L, Loupias B, Philippe F, Tassin V, Amiranoff F, Kline J L, Montgomery D S, Afeyan B B 2016 Phys. Rev. E 93 043209 Google Scholar
[23]	Moody J D, Datte P, Krauter K, Bond E, Michel P A, Glenzer S H, Divol L, Niemann C, Suter L, Meezan N, MacGowan B J, Hibbard R, London R, Kilkenny J, Wallace R, Kline J L, Knittel K, Frieders G, Golick B, Ross G, Widmann K, Jackson J, Vernon S, Clancy T 2010 Rev. Sci. Instrum. 81 10D921 Google Scholar

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