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Cite this article as: Wang Zhi-Bin,Jiao Zhi-Hong,Zhou Xiao-Xin. Generation of elliptically polarized attosecond pulse trains of He atom driven by tri-circular laser pulses [J]. J. At. Mol. Phys.(原子与分子物理学报), 2020, 37: 95 (in Chinese)
Generation of elliptically polarized attosecond pulse trains of He atom driven by tri-circular laser pulses
Hits 147  Download times 32  Received:March 06, 2019  Revised:April 01, 2019
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Key Words   Trichromatic circular polarized laser  High-order harmonic generation  Attosecond pulse train  Ellipticity
Author NameAffiliation
Wang Zhi-Bin 西北师范大学 
Jiao Zhi-Hong 西北师范大学 
Zhou Xiao-Xin 西北师范大学 
Abstract
    We present a method to obtain a large elliptical attosecond pulse train of He atom driven by a trichromatic circular polarization laser pulse composed of the counterrotating circularly polarized laser pulse with frequencies , and frequency with a weak intensity. We calculate the high-order harmonic spectra emitted by helium atoms driven by two-color and three-color circularly polarized laser pulses and the synthesized attosecond pulse train by using the strong field approximation method. It is found that the ellipticity of the attosecond pulse train emitted He atom driven by the two-color laser pulse joined the third color laser pulse with a low intensity can be enhanced, compared with the case of two-color laser pulse. A big ellipticity for attosecond pulse train can be obtained for atom whose initial state is s state by adjusting the intensity ratio of laser pulses with the appropriate intensity of the third color laser with frequency .

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