INTERACTION OF AN ULTRASHORT, RELATIVISTICALLY STRONG LASER-PULSE WITH AN OVERDENSE PLASMA
INTERACTION OF AN ULTRASHORT, RELATIVISTICALLY STRONG LASER-PULSE WITH AN OVERDENSE PLASMA
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DOI：
10.1063/1.870766
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发表时间：
1994-03-01
影响因子：
2.2
通讯作者：
PEGORARO, F
中科院分区：
文献类型：
--
作者：
BULANOV, SV;NAUMOVA, NM;PEGORARO, F
的分析描述和一个细胞中的粒子模拟的相互作用的超短，相对论强激光脉冲，斜入射在一个不均匀的过密等离子体的结果，提出了几个新的功能被确定。讨论了锐边界等离子体对超强电磁激光辐射的吸收、反射、高次谐波的产生以及向低频辐射的转换。在弱等离子体非均匀性的情况下，在等离子体共振区的非线性朗缪尔振荡的激发和由此产生的电子加速进行了研究。还研究了电子的真空加热和电子轨道的自相交。在尖锐边界等离子体的情况下，激光脉冲的能量的一部分被发现被转换成一个本地化的，相对论性强，非线性电磁脉冲传播到等离子体。热电子云向真空区的膨胀和激光脉冲在朗缪尔振荡的局域纵向电场中的有质动力作用导致离子加速。少数人口的多电荷离子的能量增加被发现是远远大于周围的离子。
The results of an analytical description and of a particle-in-cell simulation of the interaction of an ultrashort, relativistically intense laser pulse, obliquely incident on a nonuniform overdense plasma, are presented and several novel features are identified. The absorption and reflection of the ultraintense electromagnetic laser radiation from a sharp-boundary plasma, high harmonic generation, and the transformation into low-frequency radiation are discussed. In the case of weak plasma nonuniformity the excitation of nonlinear Langmuir oscillations in the plasma resonance region and the resulting electron acceleration are investigated. The vacuum heating of the electrons and the self-intersection of the electron trajectories are also studied. In the case of a sharp-boundary plasma, part of the energy of the laser pulse is found to be converted into a localized, relativistically strong, nonlinear electromagnetic pulse propagating into the plasma. The expansion of the hot electron cloud into the vacuum region and the action of the ponderomotive force of the laser pulse in the localized longitudinal electric field of the Langmuir oscillations lead to ion acceleration. The energy increase of a minority population of multicharged ions is found to be much greater than that of the ambient ions.