Amplitude and rotation of the ellipticity of harmonicsfrom a linearly polarized laser field

doi:10.1088/1674-1056/ac8ce8

中国物理B ›› 2022, Vol. 31 ›› Issue (10): 103303-103303.doi: 10.1088/1674-1056/ac8ce8

所属专题： SPECIAL TOPIC — Celebrating the 70th Anniversary of the Physics of Jilin University

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Amplitude and rotation of the ellipticity of harmonicsfrom a linearly polarized laser field

Ping Li(李萍)^1,2, Na Gao(高娜)^1,2, Rui-Xian Yu(蔚瑞贤)^1,2, Jun Wang(王俊)^1,2, Su-Yu Li(李苏宇)^1,2, Fu-Ming Guo(郭福明)^1,2,†, and Yu-Jun Yang(杨玉军)^1,2,‡

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

收稿日期:2022-07-06 修回日期:2022-08-16 出版日期:2022-10-16 发布日期:2022-09-16
通讯作者: Fu-Ming Guo, Yu-Jun Yang E-mail:guofm@jlu.edu.cn;yangyj@jlu.edu.cn
基金资助:
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, and the high performance computing cluster Tiger@IAMP.

Amplitude and rotation of the ellipticity of harmonicsfrom a linearly polarized laser field

Ping Li(李萍)^1,2, Na Gao(高娜)^1,2, Rui-Xian Yu(蔚瑞贤)^1,2, Jun Wang(王俊)^1,2, Su-Yu Li(李苏宇)^1,2, Fu-Ming Guo(郭福明)^1,2,†, and Yu-Jun Yang(杨玉军)^1,2,‡

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

Received:2022-07-06 Revised:2022-08-16 Online:2022-10-16 Published:2022-09-16
Contact: Fu-Ming Guo, Yu-Jun Yang E-mail:guofm@jlu.edu.cn;yangyj@jlu.edu.cn
Supported by:
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, and the high performance computing cluster Tiger@IAMP.

摘要/Abstract

摘要： We simulate the dynamic response of H₂⁺ in a linearly polarized laser field by numerically solving the time-dependent Schrödinger equation. The elliptically polarized high-order harmonics generated by H₂⁺ 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

Abstract: We simulate the dynamic response of H₂⁺ in a linearly polarized laser field by numerically solving the time-dependent Schrödinger equation. The elliptically polarized high-order harmonics generated by H₂⁺ 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.

Key words: high-order harmonic, ellipticity, rotation, attosecond pulses

中图分类号: (Spectra induced by strong-field or attosecond laser irradiation)

33.20.Xx

42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)

Ping Li(李萍), Na Gao(高娜), Rui-Xian Yu(蔚瑞贤), Jun Wang(王俊), Su-Yu Li(李苏宇), Fu-Ming Guo(郭福明), and Yu-Jun Yang(杨玉军). Amplitude and rotation of the ellipticity of harmonicsfrom a linearly polarized laser field[J]. 中国物理B, 2022, 31(10): 103303-103303.

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Amplitude and rotation of the ellipticity of harmonicsfrom a linearly polarized laser field

Amplitude and rotation of the ellipticity of harmonicsfrom a linearly polarized laser field

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