Interferometric study of laser‐produced plasmas
Interferometric study of laser‐produced plasmas
复制标题
激光产生等离子体的干涉研究
DOI：
--
复制
发表时间：
1976
期刊：
影响因子：
--
通讯作者：
R. Andrews
中科院分区：
文献类型：
--
作者：
J. Reintjes;T. Lee;R. Eckardt;R. Andrews
使用相对简单的Jamin型干涉仪和来自锁模Nd：YAG激光器的精确定时的30 psec探测激光脉冲（倍频至532 nm），获得了空间分辨率为15 μm的激光产生等离子体的高质量干涉图。利用本装置可获得的空间分辨率受到膨胀等离子体的速度和探测脉冲的有限持续时间的限制。等离子体是通过将Nd：glass调Q激光脉冲（0.5 GW，1011-1013 W cm−2）聚焦到Al、Mg和（CH 2）n的板状靶上产生的。研究了点焦点和线焦点的电子密度分布、等离子体尺寸和膨胀速度随锁模和调Q激光脉冲之间时间延迟的变化。比较了不同加热（Q开关）脉冲持续时间和各种靶材料的结果。
High‐quality interferograms of laser‐produced plasmas with spatial resolution of 15 μm are obtained using a relatively simple Jamin‐type interferometer and a precisely timed 30‐psec probing laser pulse from a mode‐locked Nd : YAG laser, frequency doubled to 532 nm. The spatial resolution attainable with the present arrangement is limited by the velocity of the expanding plasma and the finite duratiaon of the probing pulse. The plasmas are produced by focusing a Nd : glass Q‐switched laser pulse (0.5 GW, 1011–1013 W cm−2) onto slab targets of Al, Mg, and (CH2)n. The electron density distribution, plasma dimension, and expansion velocity for both point and line foci are studied as a function of time delay between the mode‐locked and Q‐switched laser pulses. The results obtained with different durations of the heating (Q‐switched) pulse and with the various target material are compared.