Terahertz emission in tenuous gases irradiated by ultrashort laser pulses

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WANG Wei-Min, SHENG Zheng-Ming, WU Hui-Chun, CHEN Min, LI Chun and ZHANG Jie. Terahertz emission in tenuous gases irradiated by ultrashort laser pulses[J]. Chinese Physics C, 2009, 33(S2): 142-145. doi: 10.1088/1674-1137/33/S2/037
WANG Wei-Min, SHENG Zheng-Ming, WU Hui-Chun, CHEN Min, LI Chun and ZHANG Jie. Terahertz emission in tenuous gases irradiated by ultrashort laser pulses[J]. Chinese Physics C, 2009, 33(S2): 142-145.  doi: 10.1088/1674-1137/33/S2/037 shu
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Received: 2009-01-05
Revised: 1900-01-01
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Terahertz emission in tenuous gases irradiated by ultrashort laser pulses

    Corresponding author: SHENG Zheng-Ming,

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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