Generation of elliptical isolated attosecond pulse from oriented H_(2)^(+)in a linearly polarized laser field  

作　　者：Yun-He Xing Jun Zhang Xiao-Xin Huo Qing-Yun Xu Xue-Shen Liu 邢云鹤;张军;霍晓鑫;徐清芸;刘学深(Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China)

机构地区：[1]Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China

出　　处：《Chinese Physics B》2022年第4期281-286,共6页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grants Nos.12074142 and 11904122)。

摘　　要：We investigate the ellipticity of the high-order harmonic generation from the oriented H_(2)^(+)exposed to a linearly polarized laser field by numerically solving the two-dimensional time-dependent Schrodinger equation(2 D TDSE).Numerical simulations show that the harmonic ellipticity is remarkably sensitive to the alignment angle.The harmonic spectrum is highly elliptically polarized at a specific alignment angleθ=30°,which is insensitive to the variation of the laser parameters.The position of the harmonic intensity minima indicates the high ellipticity,which can be attributed to the two-center interference effect.The high ellipticity can be explained by the phase difference of the harmonics.This result facilitates the synthesis of a highly elliptical isolated attosecond pulse with duration down to 65 as,which can be served as a powerful tool to explore the ultrafast dynamics of molecules and study chiral light-matter interaction.

关 键 词：high harmonic generation linearly polarized laser fields elliptical isolated attosecond pulse alignment angle two-center interference effect 

分 类 号：TN24[电子电信—物理电子学]