COMPETITION BETWEEN PONDEROMOTIVE AND THERMAL FORCES IN SHORT-SCALE-LENGTH LASER PLASMAS
COMPETITION BETWEEN PONDEROMOTIVE AND THERMAL FORCES IN SHORT-SCALE-LENGTH LASER PLASMAS
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DOI：
10.1103/physrevlett.69.1935
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发表时间：
1992-09-28
影响因子：
8.6
通讯作者：
UMSTADTER, D
中科院分区：
文献类型：
--
作者：
LIU, X;UMSTADTER, D
利用时间积分和时间分辨测量方法研究了400-fs强激光脉冲与固体目标的相互作用。后者是通过泵浦和探针实验来完成的，其中临界表面的运动以250-fs的分辨率测量。研究发现，当电子的平均颤振能（mv(os)2/2）与电子的平均热能（kT(e)）相当时，高强度激光的质动势显著降低了激光等离子体的热膨胀。本研究是在一个有趣的制度下进行的，不容易与较长的脉冲激光，其中电子密度尺度长度在激光脉冲期间远小于激光波长。
Interactions of intense 400-fs laser pulses with a solid target are studied with time-integrated and time-resolved measurements. The latter are accomplished by means of a pump and probe experiment, in which the motion of the critical surface is measured with 250-fs resolution. It is found that when the average electron quiver energy (mv(os)2/2) becomes comparable to the electron thermal energy (kT(e)), the ponderomotive force of the high-intensity laser significantly reduces the laser plasma thermal expansion. This study is performed in an interesting regime not easily accessible with longer pulse lasers, in which the electron density scale length during the laser pulse was much less than the laser wavelength.