Simulation of High Power THz Emission from Laser Interaction with Tenuous Plasma and Gas Targets  

作　　者：Zheng-Ming Sheng Hui-Chun Wu Wei-MinWang Min Chen Xiao-Gang Dong Jun Zheng Jie Zhang 

机构地区：[1]Department of Physics,Shanghai Jiao Tong University,Shanghai 200240,China [2]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,CAS,Beijing 100190,China [3]Max-Planck-Institut f¨ur Quanenoptik,D-85748 Garching,Germany

出　　处：《Communications in Computational Physics》2008年第10期1258-1278,共21页计算物理通讯（英文）

基　　金：This workwas supported in part by theNationalNatural Science Foundation of China(Grants No.10425416,10335020,10674175,60621063);the National High-Tech ICF Committee in China,and the National Basic Research Program of China(Grant No.2007CB310406).

摘　　要：With one-and two-dimensional particle-in-cell(PIC)codes,we simulate the generation of high power terahertz(THz)emission from the interaction of ultrashort intense lasers with tenuous plasma and gas targets.By driving high-amplitude electron plasma waves either with a laser wakefield or the beatwave of two laser pulses,powerful THz electromagnetic pulses can be produced by linear mode conversion in inhomogeneous plasma or by the transient current induced at the surfaces of a thin plasma layer of few plasma wavelengths.Even with incident lasers at moderate intensity such as 1017W/cm2,the produced emission can be at the level of tens of MW in power and capable of affording field strengths of a few MV/cm,suitable for the studies of THz nonlinear physics.With field ionization included in the PIC codes,THz emission from laser interaction with tenuous gas targets is simulated.It is found that the transient transverse current formed during the ionization processes is responsible for the THz emission.With this mechanism,onemay also obtain THz fields ofMV/cm at lower laser intensity as compared with the schemes of plasma-wave excitation.

关 键 词：Particle-in-cell simulation LASER-PLASMA electron plasma wave high power THz emission 

分 类 号：TN2[电子电信—物理电子学]