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用二维粒子模拟程序研究了超短脉冲强激光与等离子体相互作用中局域低频电磁场的产生现象 .这种低频电磁场在超短脉冲激光激发尾波场、脉冲后沿产生频率下移的过程中形成 .通常它们的振荡频率接近于或低于电子等离子体振荡频率 ,因而被捕获在等离子体中 (即传播速度接近于零 ) .在演化过程中 ,通常它们以孤子场的形式出现 .这种孤子波的形成及其演化与离子运动有极大关系 .用相对论强激光脉冲可以产生达到相对论振幅的电磁场孤子波 ,后者可以把离子加速到非常高的能量 .研究还表明 ,在二维几何位形下 ,孤子波产生与入射光的偏振态有很大关系 .
The generation of local low-frequency electromagnetic fields in the interaction between ultrashort pulse laser and plasmas was studied by a two-dimensional particle simulator. This low-frequency electromagnetic field produced a downward frequency shift in the tail wave field and pulse trailing edge of the ultrashort pulse laser Usually oscillates at or below the electron-plasma oscillation frequency and is thus trapped in the plasma (ie, the propagation velocity is near zero), and usually they appear in the form of soliton fields during evolution. The formation and evolution of soliton waves are strongly related to ion motion. Relativistic intense laser pulses can generate electromagnetic soliton wave reaching the relativistic amplitudes, which can accelerate ions to very high energies. The study also shows that in the two-dimensional Under the geometrical configuration, the soliton wave generation has a great relationship with the polarization state of incident light.