短脉冲强激光在稀薄等离子体中传播时的电磁类孤立子
Study on the spatial localized structure in short and intense laser pulse with underdense plasma
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摘要: 采用二维粒子模拟方法，研究了短脉冲强激光在稀薄等离子体中传播时电磁类孤立子的产生和时空演化过程。通过分析电磁场与等离子体波的非线性能量交换和激光场的频率谱结构等，给出了电磁类孤立子形成的基本物理图像，讨论了等离子体参数对电磁类孤立子形成的影响。模拟结果表明：类孤立子的形成是由于局部电磁波振荡频率减小至等离子体频率引起的，初始等离子体密度越高越容易形成空间局域结构。Abstract: Spatial localized structure(solitonlike electromagnetic wave) has been observed following the interaction of an intense and short laser pulse with underdense plasma using the two dimensional PIC simulation.The formation mechanism and spatiotemporal evolution of the solitonlike wave and related phenomena such as the energy exchange process of electromagnetic field with plasma wave, the frequency downshift of laser pulse,and the caviton formation were discussed. Once EM wave oscilation frequence is lower than plasma frequcnce, the localized structure will appear and it is easier to form in higher initial plasma density.
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Key words:
- particle in cell simulation /
- spatial localized structure /
- frequency downshift /
- soliton
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