超强激光驱动天线靶的太赫兹辐射物理特性研究  

Study of Ultra-Intense Laser Driven Solid Line Emitting Terahertz Wave

作　　者：李星火[1] 卓红斌[1] 邹德滨[1] 

机构地区：[1]国防科学技术大学理学院,湖南长沙410073

出　　处：《光学学报》2015年第3期171-177,共7页Acta Optica Sinica

基　　金：国家973计划(2013CBA01504)

摘　　要：利用激光与等离子体相互作用产生超强太赫兹辐射的研究成为国内外研究的热点。基于Smith提出的线形天线辐射理论,对超强超短激光脉冲驱动天线靶产生太赫兹的辐射特性进行研究,建立了完备的辐射空间分布和频谱空间分布表达式。利用激光脉冲长度与天线长度的比值对辐射场分布的影响,讨论了固定天线长度时的最佳激光脉冲长度,以及固定激光条件时,天线长度对辐射场的频谱和空间分布的调制作用。理论分析结果表明,激光脉冲长度决定了辐射频率范围,激光脉冲长度与天线长度的比值决定了辐射场峰值的方向和频谱分布,为设计合理实验方案提供理论依据。The ultra-intense terahertz radiation from laser plasma interaction is widely studied. The terahertz radiation from ultra-intense laser pulse driven wire target is studied by using the radiation theory of antenna proposed by Smith. The expressions of the radiation field are obtained and the space radiation field and frequency spectrum are presented. Based on the study of the influence of the ratio of laser duration to target length on radiation field distribution, the optimum laser duration for a constant target length is discussed, and the modulation of the target length on the radiation field for a constant laser condition is obtained. Theoretical analysis indicates that the range of frequency is determined by the laser duration, and the distribution of spectrum is determined by the ratio of laser duration to target length, which provides theoretical basement for the experiment design.

关 键 词：激光技术 等离子体物理 天线 太赫兹辐射 超强激光 频谱 

分 类 号：O539[理学—等离子体物理]