双色线偏振激光场驱动H2+分子产生椭圆偏振阿秒脉冲
Elliptically polarized attosecond pulse generation from H2+ driven by the two-color linearly polarized field

理论研究了双色线偏振激光场驱动H2+分子产生椭圆偏振谐波及阿秒脉冲的特点。计算结果表明：随着不同偏振角的引入，谐波光谱呈现不规则的椭圆率。但是，随着空间非均匀效应的引入，不仅谐波谱的椭圆率可以稳定在？ = 0.1和？ = 0.3之间，而且谐波发射的截止能量明显增强。形成4个具有较小干涉结构带宽在406 eV，299 eV，381 eV和582 eV的超长平台区。最后，通过傅里叶变换，可获得5个脉宽及椭圆率为24 as (ε = 0.1)，22 as (ε = 0.3)，24 as (ε = 0.3)，19 as (ε = 0.3)，19 as (ε = 0.3)的阿秒X射线脉冲。
Elliptically polarized harmonic spectra and attosecond pulses generation from H2+ driven by the two-color linearly polarized pulses have been theoretically investigated. The results show that with the introductions of the different polarized angles, the anomalous elliptically polarized harmonics can be found. But, with the further introduction of the spatial inhomogeneous effect, not only the ellipticities of the harmonics are equal to the stable values of ？ = 0.1 and ？ = 0.3, but also the harmonic cutoffs are enhanced. As a consequence, four supercontinua of 406 eV, 299 eV, 381 eV and 582 eV with less harmonic modulations can be obtained. Finally, through Fourier transformation of the spectral continuum, five elliptically polarized attosecond X-ray pulses with durations and ellipticities of 24 as (ε = 0.1), 22 as (ε = 0.3), 24 as (ε = 0.3), 19 as (ε = 0.3), 19 as (ε = 0.3) can be produced.