强激光与等离子体相互作用产生的超强太赫兹辐射  

Powerful terahertz emission produced in intense laser interaction with underdense plasmas

作　　者：盛政明[1] 张杰[1] 

机构地区：[1]中国科学院物理研究所光物理实验室,北京100080

出　　处：《物理》2005年第9期636-639,共4页Physics

基　　金：国家自然科学基金(批准号:10390160;10335020;10425416);国家高技术研究发展计划惯性约束聚变主题;国家重点基础研究专项经费资助项目

摘　　要：超短强激光脉冲在等离子体中传播时会激发大振幅的等离子体尾波场,它是一种电子等离子体波.由于这是一种静电波,它一般不能转换成电磁辐射.我们发现在不均匀等离子体中激发的尾波场在一定条件下可以通过线性模式转换产生电磁辐射.由于用超短强激光脉冲尾波场可以达到的电场振幅达100GV/m,其振动频率在太赫兹(1012Hz)附近,用这种方法可以产生电场强度达到GV/m的太赫兹辐射.A high-amplitude laser wakefield, which is an electron plasma wave, can be excited by an ultrashort intense laser pulse. Because it is an electrostatic wave, usually it cannot radiate. However, it has recently been found that the laser wakefield can, under certain conditions, radiate in inhomogeneous plasma through socalled mode conversion. Because the wakefield can be driven at amplitudes higher than 100GV/m with an oscillating terahertz （THz） frequency, one can generate ultra-powerful THz emission with field amplitudes greater than GV/m. This may find applications in high-field condensed matter physics and other areas.

关 键 词：超短强激光脉冲 激光尾波场 电子等离子体波 超强太赫兹辐射 等离子体波 太赫兹辐射 相互作用 不均匀等离子体 超强 电磁辐射 

分 类 号：O437[机械工程—光学工程] O534[理学—光学]