Terahertz emission in tenuous gases irradiated by ultrashort laser pulses  

作　　者：王伟民 盛政明 武慧春 陈民 李春 张杰 K. Mima 

机构地区：[1]Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, CAS [2]Department of Physics, Shanghai Jiaotong University [3]Max-Planck-Institut fr Quantenoptik [4]Institut fr Theoretische Physik I, Heinrich-Heine-Universitt Dsseldorf [5]Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita

出　　处：《Chinese Physics C》2009年第S2期142-145,共4页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10425416, 10674175, 60621063);National High-Tech ICF Com-mittee in China and National Basic Research Program of China (2007CB310406)

摘　　要：Mechanism of terahertz (THz) pulse generation in gases irradiated by ultrashort laser pulses is investigated theoretically. Quasi-static transverse currents produced by laser field ionization of gases and the longitudinal modulation in formed plasmas are responsible for the THz emission at the electron plasma frequency, as demonstrated by particle-in-cell simulations including field ionization. The THz field amplitude scaling with the laser amplitude within a large range is also discussed.Mechanism of terahertz (THz) pulse generation in gases irradiated by ultrashort laser pulses is investigated theoretically. Quasi-static transverse currents produced by laser field ionization of gases and the longitudinal modulation in formed plasmas are responsible for the THz emission at the electron plasma frequency, as demonstrated by particle-in-cell simulations including field ionization. The THz field amplitude scaling with the laser amplitude within a large range is also discussed.

关 键 词：Terahertz emission ionization of gases plasma formation particle-in-cell simulations 

分 类 号：TL503.3[核科学技术—核技术及应用]