| Terahertz emission in tenuous gases irradiated by ultrashort laser pulses |
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| 作者姓名： | 王伟民 盛政明 武慧春 陈民 李春 张杰 K. Mima |
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| 作者单位： | 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 f\"{u}r Quantenoptik, D-85748 Garching, Germany;4 Institut f\"{u}r Theoretische Physik I,;Heinrich-Heine-Universit\"{a}t D\"{u}sseldorf, D-40225 D\"{u}sseldorf, Germany;5 Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan |
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| 基金项目： | 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) |
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| 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.
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| 关 键 词： | Terahertz emission ionization of gases plasma formation particle-in-cell simulations |
| 收稿时间： | 2009-1-5 |
Terahertz emission in tenuous gases irradiated by ultrashort laser pulses |
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| 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. |
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| Keywords: | Terahertz emission ionization of gases plasma formation particle-in-cell simulations |
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