| 短脉冲强激光在稀薄等离子体中传播时的电磁类孤立子 |
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| 引用本文： | 李斌,郑春阳,朱少平,张维岩.短脉冲强激光在稀薄等离子体中传播时的电磁类孤立子[J].强激光与粒子束,2003,15(5):450-454. |
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| 作者姓名： | 李斌 郑春阳 朱少平 张维岩 |
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| 作者单位： | 北京应用物理与计算数学研究所，北京 100088 |
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| 基金项目： | 国家863计划项目资助课题，国家973计划非线性科学项目，中国工程物理研究院基金资助课题(2000Z0206) |
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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。
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| 关 键 词： | 粒子模拟 空间局域结构 频率变慢 电磁类孤立子 |
| 文章编号： | 1001-4322(2003)05-0450-05 |
| 收稿时间： | 2002/8/14 |
Study on the spatial localized structure in short and intense laser pulse with underdense plasma |
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| li bin,zheng chun-yang,zhu shao-ping,zhang wei-yan.Study on the spatial localized structure in short and intense laser pulse with underdense plasma[J].High Power Laser and Particle Beams,2003,15(5):450-454. |
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| Authors: | li bin zheng chun-yang zhu shao-ping zhang wei-yan |
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| Institution: | Institute of Applied Physics and Computational Mathematics, P.O.Box 8009,Beijing 100088, China |
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| 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 frequence,the localized structure will appear and it is easier to form in higher initial plasma density. |
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| Keywords: | Particle in cell simulation Spatial localized structure Frequency downshift Soliton |
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