Generating attosecond pulses with controllable polarization from cyclic H_(3)^(2+) molecules by bichromatic circular fields  

作　　者：张思琪 张冰 闫博 姜向前 孙秀冬 Si-Qi Zhang;Bing Zhang;Bo Yan;Xiang-Qian Jiang;Xiu-Dong Sun(School of Physics,Harbin Institute of Technology,Harbin 150001,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]School of Physics,Harbin Institute of Technology,Harbin 150001,China [2]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China

出　　处：《Chinese Physics B》2024年第2期305-310,共6页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.91950117);the Fundamental Research Funds for the Central Universities.

摘　　要：We investigate the polarization properties of harmonics from the cyclic H_(3)^(2+) molecular ions in tailored bichromatic counter-rotating circularly polarized(BCCP)fields by solving the time-dependent Schrödinger equation.The allowed harmonics and their helicities are associated with the symmetry compatibility of the field-target systems,and large intensity difference between adjacent harmonics with opposite helicities appears in a wide spectral range when the BCCP field is at certain rotation angles.We try to explain the intensity difference by using a recombination model based on the quantum-orbit theory and by analyzing the ionization pathways.Moreover,to synthesize attosecond pulse trains with tunable polarization,the intensity difference is manipulated by introducing a seed XUV field,and by changing the relative amplitude ratio as well as the helicity of BCCP fields.

关 键 词：high-order harmonic generation attosecond pulse multi-center interference 

分 类 号：O436.3[机械工程—光学工程]