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

doi:10.1088/1674-1056/aca3a1

中国物理B ›› 2023, Vol. 32 ›› Issue (1): 13201-013201.doi: 10.1088/1674-1056/aca3a1

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

Shu-Shan Zhou(周书山)¹, Yu-Jun Yang(杨玉军)², Yang Yang(杨扬)¹, Ming-Yue Suo(索明月)¹, Dong-Yuan Li(李东垣)¹, Yue Qiao(乔月)², Hai-Ying Yuan(袁海颖)², Wen-Di Lan(蓝文迪)², and Mu-Hong Hu(胡木宏)^1,†

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

收稿日期:2022-09-22 修回日期:2022-11-11 接受日期:2022-11-17 出版日期:2022-12-08 发布日期:2022-12-08
通讯作者: Mu-Hong Hu E-mail:humuhong@163.com
基金资助:
Project supported by the National Key Research and Development Program of China (Grant No. 2019YFA0307700) and the National Natural Science Foundation of China (Grant Nos. 12204214, 12074145, and 11627807).

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

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

Received:2022-09-22 Revised:2022-11-11 Accepted:2022-11-17 Online:2022-12-08 Published:2022-12-08
Contact: Mu-Hong Hu E-mail:humuhong@163.com
Supported by:
Project supported by the National Key Research and Development Program of China (Grant No. 2019YFA0307700) and the National Natural Science Foundation of China (Grant Nos. 12204214, 12074145, and 11627807).

摘要/Abstract

摘要： High-order harmonic generation of the cyclo[18]carbon (C₁₈) 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 C₆ H₆ having similar ionization potential, the C₁₈ molecule has higher efficiency and cutoff energy than C₆ H₆ with the same laser field parameters. Further researches indicate that the harmonic efficiency and cutoff energy of the C₁₈ 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 C₆ H₆ 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 C₁₈ 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 C₁₈ 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

Abstract: High-order harmonic generation of the cyclo[18]carbon (C₁₈) 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 C₆ H₆ having similar ionization potential, the C₁₈ molecule has higher efficiency and cutoff energy than C₆ H₆ with the same laser field parameters. Further researches indicate that the harmonic efficiency and cutoff energy of the C₁₈ 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 C₆ H₆ 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 C₁₈ 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 C₁₈ molecule has a wide range of applications in producing circularly polarized isolated attosecond pulse.

Key words: time-dependent density functional theory, high-order harmonic generation, circularly polarized attosecond pulse

中图分类号: (Multiphoton ionization and excitation to highly excited states)

32.80.Rm

42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift) 42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)

Shu-Shan Zhou(周书山), Yu-Jun Yang(杨玉军), Yang Yang(杨扬), Ming-Yue Suo(索明月), Dong-Yuan Li(李东垣), Yue Qiao(乔月), Hai-Ying Yuan(袁海颖), Wen-Di Lan(蓝文迪), and Mu-Hong Hu(胡木宏). High-order harmonic generation of the cyclo[18]carbon molecule irradiated by circularly polarized laser pulse[J]. 中国物理B, 2023, 32(1): 13201-013201.

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

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

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