High-order harmonic generation of the cyclo[18]carbon molecule irradiated by circularly polarized laser pulse  

作　　者：周书山 杨玉军 杨扬 索明月 李东垣 乔月 袁海颖 蓝文迪 胡木宏 Shu-Shan Zhou;Yu-Jun Yang;Yang Yang;Ming-Yue Suo;Dong-Yuan Li;Yue Qiao;Hai-Ying Yuan;Wen-Di Lan;Mu-Hong Hu(School of Physics and Electronic Technology,Liaoning Normal University,Dalian 116029,China;Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China)

机构地区：[1]School of Physics and Electronic Technology,Liaoning Normal University,Dalian 116029,China [2]Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China

出　　处：《Chinese Physics B》2023年第1期286-292,共7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 National Natural Science Foundation of China (Grant Nos.12204214,12074145,and 11627807)。

摘　　要：High-order harmonic generation of the cyclo[18]carbon(C_(18) ) molecule under few-cycle circularly polarized laser pulse is studied by time-dependent density functional theory. Compared with the harmonic emission of the ring molecule C_(6)H_(6) having similar ionization potential, the C_(18) molecule has higher efficiency and cutoff energy than C_(6)H_(6) with the same laser field parameters. Further researches indicate that the harmonic efficiency and cutoff energy of the C_(18) molecule increase gradually with the increase of the laser intensity of the driving laser or decrease of the wavelength, both are larger than those of the C_(6)H_(6) molecule. Through the analysis of the time-dependent evolution of the electronic wave packets, it is also found that the higher efficiency of harmonic generation can be attributed to the larger spatial scale of the C_(18) molecule,which leads to a greater chance for the ionized electrons from one atom to recombine with others of the parent molecule.Selecting the suitable driving laser pulse, it is demonstrated that high-order harmonic generation in the C_(18) molecule has a wide range of applications in producing circularly polarized isolated attosecond pulse.

关 键 词：time-dependent density functional theory high-order harmonic generation circularly polarized attosecond pulse 

分 类 号：TN24[电子电信—物理电子学] O641.1[理学—物理化学] O613.71[理学—化学]