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Terahertz emission in tenuous gases irradiated by ultrashort laser pulses |
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| Authors: | WANG Wei-Min SHENG Zheng-Ming WU Hui-Chun CHEN Min LI Chun ZHANG Jie KMima |
| Institution: | WANG Wei-Min1 SHENG Zheng-Ming1,2;1) WU Hui-Chun3 CHEN Min4 LI Chun2 ZHANG Jie1,2 K. Mima5 1 (Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, CAS, Beijing 100190, China) 2 (Department of Physics, Shanghai Jiaotong University, Shanghai 200240, China) 3 (Max-Planck-Institut fr Quantenoptik, D-85748 Garching, Germany) 4 (Institut fr Theoretische Physik I, Heinrich-Heine-Universitt Dsseldorf, D-40225 Dsseldorf, Germany) 5 (Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan) |
| Abstract: | 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. |
| Keywords: | Terahertz emission ionization of gases plasma formation particle-in-cell simulations |
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