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核聚变与等离子体物理 ›› 2014, Vol. 34 ›› Issue (2): 107-110.

• 等离子体物理学 • 上一篇    下一篇

光束质量对激光等离子体受激布里渊散射影响研究

王传珂1, 2,蒋小华2,蒋 刚1,章 欢1, 2,刘 浩1, 2,竹文坤3,王哲斌2,刘慎业2,丁永坤2   

  1. (1. 四川大学原子与分子物理研究所,成都 610065; 2. 中国工程物理研究院 激光聚变研究中心,绵阳 621900; 3. 西南科技大学国防科技学院,绵阳 621010)
  • 收稿日期:2013-05-31 修回日期:2013-12-05 出版日期:2014-06-15 发布日期:2014-06-16
  • 作者简介:王传珂(1981-),男,山东兖州人,博士研究生,主要从事激光聚变实验和诊断研究。
  • 基金资助:

    国家自然科学基金项目(11005097);四川省非金属复合与功能材料重点实验室——省部共建国家重点实验室培育基地基金资助课题(12ZXFK12)

Influence of beam quality on stimulated Brillouin scattering of laser-produced plasma

WANG Chuan-ke1, 2, JIANG Xiao-hua2, JIANG Gang1, ZHANG Huan1, 2, LIU Hao2, ZHU Wen-kun3, WANG Zhe-bin2, LIU Shen-ye2, DING Yong-kun2   

  1. (1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065; 2. Research Center of Laser Fusion, Chinese Academy of Engineering Physics, Mianyang 621900; 3. National Defense Science and Technology, Southwest University of Science and Technology, Mianyang 621010)
  • Received:2013-05-31 Revised:2013-12-05 Online:2014-06-15 Published:2014-06-16

摘要:

在“星光Ⅱ”钕玻璃激光装置上,开展了脉宽约0.8ns、能量~70J的351nm激光在不同条件下辐照Au盘靶的实验,研究了激光光束质量对受激布里渊散射(SBS)谱的影响。SBS散射光谱测量结果表明,在激光束未匀滑条件下,SBS散射谱范围为352~360nm;在采用透镜列阵将激光束匀滑聚焦的条件下,激光等离子体密度变得更加均匀,SBS散射光谱范围变为351~351.5nm。实验数据为透镜列阵对光束的匀滑效果提供了直接支持。

关键词: 激光等离子体, 散射光, 盘靶, 受激布里渊散射

Abstract:

Experiments about interaction of 351nm laser of the ~0.8ns pulse duration and ~70J energy with Au disk targets were conducted on “XingguangⅡ” neodymium glass laser facility under the different conditions. The influences of beam quality on stimulated Brillouin scattering (SBS) spectra were studied. When the laser beam was not smoothed, the SBS spectrum ranges from 352nm to 360nm. When the laser beam was smoothed by lens array, the SBS spectrum ranges from 351nm to 351.5nm because plasma density becomes uniform. Experimental data provides direct support for the smoothing effect of the lens array.

Key words: Laser-produced plasma, Scattered light, Disk target, Stimulated Brillouin scattering

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