Amplitude and rotation of the ellipticity of harmonics from a linearly polarized laser field  

作　　者：Ping Li Na Gao Rui-Xian Yu Jun Wang Su-Yu Li Fu-Ming Guo Yu-Jun Yang 李萍;高娜;蔚瑞贤;王俊;李苏宇;郭福明;杨玉军(Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China;Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy(Jilin University),Changchun 130012,China)

机构地区：[1]Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China [2]Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy(Jilin University),Changchun 130012,China

出　　处：《Chinese Physics B》2022年第10期88-95,共8页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2019YFA0307700);the Science Foundation of China(Grant Nos.11627807,11774129,and 12074145);the High Performance Computing Center of Jilin University for supercomputer time;the high performance computing cluster Tiger@IAMP。

摘　　要：We simulate the dynamic response of H^(+)_(2) in a linearly polarized laser field by numerically solving the time-dependent Schr?dinger equation.The elliptically polarized high-order harmonics generated by H^(+)_(2)irradiated by the linearly polarized laser field are systematically investigated.The result shows that the amplitude and rotation of the ellipticity of harmonics are affected by the alignment angle and internuclear distance of the molecule.Analyzing the change in forces acted on the ionized electrons and the trajectories of the electrons,the phenomena are found to be due to the change in the direction of the total Coulomb forces from the two nuclei felt by the recollided ionized electrons in the direction perpendicular to the laser polarization direction.Based on the influence law,we can select the harmonics with a specific frequency band under different alignment angles and then synthesize the isolated attosecond pulses with different rotations,which can be continuously converted from right-handed circular polarization,linear polarization,and left-handed circular polarization by changing the alignment angle.This study provides a new possible approach to the real-time detection of molecular states by using attosecond pulses and obtaining more optimized harmonics with molecular properties.

关 键 词：high-order harmonic ELLIPTICITY ROTATION attosecond pulses 

分 类 号：TN24[电子电信—物理电子学] O56[理学—原子与分子物理]