Moving electron density gratings induced in the beat-wave field of two counterpropagating laser pulses
Moving electron density gratings induced in the beat-wave field of two counterpropagating laser pulses
复制标题
在两个反向传播激光脉冲的拍波场中感应的移动电子密度光栅
DOI：
10.1063/1.3480104
复制
发表时间：
2010-08-01
影响因子：
2.2
通讯作者：
Shao, F. Q.
中科院分区：
文献类型：
--
作者：
Chen, H. Y.;Yin, Y.;Shao, F. Q.
The production and physical characteristics of moving electron density gratings (MEDGs) are investigated by analytical model and particle-in-cell (PIC) simulations. When the frequency difference of two counterpropagating pump pulses is equal to the electron plasma frequency, large amplitude electron plasma wave is resonantly excited in the plasma. As a result, electrons are excited to form a moving, gratinglike structure in the interfering region of pump pulses, while the ions keep at rest. The spatial period and velocity of the MEDG are obtained by solving the electron density modulation equation, which agrees well with one-dimensional PIC simulation results. When a short signal laser pulse is scattered on the MEDG, the frequency of the backscattering wave shifts due to the stimulated Raman scattering.
