有限宽全息干涉技术对等离子体电子密度的诊断  

Investigation on Plasma Electron Density Distribution with Finite Holographic Interferometry

作　　者：雷岚[1] 曹娜[1] 曹亮[1] 徐青[1] 韩长材[1] 段宝军[1] 

机构地区：[1]西北核技术研究所激光与物质相互作用国家重点实验室,陕西西安710024

出　　处：《中国激光》2015年第1期74-78,共5页Chinese Journal of Lasers

摘　　要：利用Nd:YAG激光器产生的1064 nm激光束(光斑直径为100μm,脉冲能量为60 m J,脉冲宽度为200 ps)聚焦击穿大气形成激光大气等离子体。采用全息干涉技术对激光击穿空气等离子体的电子密度分布进行了诊断,获得的无限宽条纹图直观反映了位移量的等位线,从有限宽条纹图获得了电子密度的分布,结果表明激光大气等离子体中各种离子和电子呈橄榄形分布,即沿激光束方向不对称,而垂直激光束方向对称分布,且最大电子密度为1018cm-3量级。Laser-induced air plasma is produced by focusing an 1064 nm Nd：YAG laser beam （spot diameter of 100 μm , pulse energy of 60 mJ, pulse width of 200 ps）. The electron density distribution is diagnosed by holographic interferometry. The displacement isoline is obtained from infinite interferogram, and the electron density distribution is calculated from finite interferogram. The results indicate that the ion and electron in laser-induced air plasma form in an olivary shape, which has symmetrical distribution in the vertical direction but unsymmetrical distribution in the horizontal direction, and the maximal electron density is about 10^18 cm-3.

关 键 词：全息 激光大气等离子体 电子密度 全息干涉 激光探针 

分 类 号：TL653[核科学技术—核技术及应用] TN247[电子电信—物理电子学]