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引用本文格式: 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., 2020, 37: 95 (in Chinese) [王志斌,焦志宏,周效信. 三色圆偏振激光组合脉冲驱动氦原子产生椭圆偏振的阿秒脉冲 [J]. 原子与分子物理学报, 2020, 37: 95]
 
三色圆偏振激光组合脉冲驱动氦原子产生椭圆偏振的阿秒脉冲
Generation of elliptically polarized attosecond pulse trains of He atom driven by tri-circular laser pulses
摘要点击 110  全文点击 26  投稿时间:2019-03-06  修订日期:2019-04-01
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DOI编号   
中文关键词   三色圆极化激光  高次谐波  阿秒脉冲链  椭偏率
英文关键词   Trichromatic circular polarized laser  High-order harmonic generation  Attosecond pulse train  Ellipticity
基金项目   国家自然科学基金
作者单位
王志斌 西北师范大学 
焦志宏 西北师范大学 
周效信 西北师范大学 
中文摘要
    我们提出利用频率为 和强度较弱的 组成的三色圆偏振激光组合脉冲驱动氦原子能够得到椭偏率较大的阿秒脉冲链的一种方法. 通过强场近似方法,计算了氦原子在两色和三色圆偏振激光组合脉冲驱动下发射高次谐波谱及其合成阿秒脉冲链,比较了氦原子(初态为s态)在这两种情况下发射高次谐波谱的特点及其合成阿秒脉冲链椭偏率的大小,结果发现,在反旋的两色 激光脉冲基础上加入了频率为 的第三色激光脉冲联合作用到氦原子上,所得到的阿秒脉冲链的椭偏率相对于双圆场情况下有所增加,通过调整 激光的强度比,并且选择适当的第三色激光的强度,对初态为s态的原子,仍能够得到具有较大椭偏率的阿秒脉冲链.
英文摘要
    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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