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用一维粒子模拟方法(Particle-in-Cel)数值研究了超短超强激光(Iλ2>1018Wμm2/cm2)与稀薄等离子体的相互作用过程。结果表明,超短超强激光与稀薄等离子体相互作用后,在等离子体中激发起尾波和拉曼(Raman)波,它们的波长和频率的值与解析解符合得很好;同时在尾波的作用下,等离子体中的部分电子被加速到很高的速度,甚至接近光速。
The interaction between ultrashort superlattice laser (Iλ2> 1018Wμm2 / cm2) and rarefaction plasma was studied by one-dimensional particle simulation (Particle-in-Cel). The results show that the ultrashort superlattice laser interacts with the lean plasma to excite the Raman wave and Raman wave in the plasma. The values of their wavelength and frequency agree well with the analytic solutions. At the same time, Under the action of waves, some of the electrons in the plasma are accelerated to very high speeds, even approaching the speed of light.