乙烯在laser场中的高次谐波产生和多光子电离
High-order harmonic generation and multi-photon ionization of ethylene in laser fields
摘要：
采用含时局域密度近似（TDLDA）方法，研究了乙烯在单色（$ω=2.72$ eV）和双色（$ω_1=2.72$ eV和$ω_2=5.44$ eV）超短强激光脉冲作用下的高次谐波产生.单色光场作用下乙烯的高次谐波谱出现明显的平台，产生奇次谐波;双色光场作用下乙烯的高次谐波谱出现对称性破缺，产生偶次谐波。结果表明，双色激光场使高电荷态的电离几率增大。利用时频分析方法研究了乙烯分子高次谐波光谱的时间结构，揭示了单色和双色激光场中乙烯分子高次谐波的形成机理。
英文摘要：
Applying time-dependent local density approximation (TDLDA), we study the high-order harmonic generation (HHG) of ethylene subjected to the one-color ($ω=2.72$ eV) and the two-color ($ω_1=2.72$ eV and $ω_2=5.44$ eV) ultrashort intense laser pulses. The HHG spectrum of ethylene in the one-color laser field shows the obvious plateaus and odd order harmonics are produced while the two-color laser field can result in the breaking of the symmetry and generation of the even order harmonic. The ionization probabilities are obtained showing the increase of the ionization probability of higher charge state by the two-color laser field. The temporal structures of HHG spectrum of ethylene is explored by means of the time-frequency analysis showing new insights of the HHG mechanisms in the one-color and the two-color laser fields.
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