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Helicity of harmonic generation and attosecond polarization with bichromatic circularly polarized laser fields |
| Jun Zhang(张军)1,2, Tong Qi(齐桐)2, Xue-Fei Pan(潘雪飞)2, Jing Guo(郭静)2, Kai-Guang Zhu(朱凯光)1, Xue-Shen Liu(刘学深)2 |
1 College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130026, China;
2 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China |
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Abstract We theoretically investigate the high-order harmonic generation (HHG) of helium atom driven by bichromatic counter-rotating circularly polarized laser fields. By changing the intensity ratio of the two driving laser fields, the spectral chirality of the HHG can be controlled. As the intensity ratio increases, the spectral chirality will change from positive- to negative-value around a large intensity ratio of the two driving fields when the total laser intensity keeps unchanged. However, the sign of the spectral chirality can be changed from positive to negative around a small intensity ratio of the two driving fields when the total laser intensity changes. At this time, we can effectively control the helicity of the harmonic spectrum and the polarization of the resulting attosecond pulses by adjusting the intensity ratio of the two driving laser fields. As the intensity ratio and the total intensity of the driving laser fields increase, the relative intensity of either the left-circularly or right-circularly polarized harmonic can be enhanced. The attosecond pulses can evolve from being elliptical to near linear correspondingly.
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Received: 28 June 2019
Revised: 13 August 2019
Accepted manuscript online:
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PACS:
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32.80.Rm
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(Multiphoton ionization and excitation to highly excited states)
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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42.65.Re
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(Ultrafast processes; optical pulse generation and pulse compression)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61575077), the Natural Science Foundation of Jilin Province of China (Grant No. 20180101225JC), the China Postdoctoral Science Foundation (Grants Nos. 2018M641766 and 2019T120232), and the Graduate Innovation Fund of Jilin University, China (Grant No. 101832018C105). |
Corresponding Authors:
Kai-Guang Zhu, Xue-Shen Liu
E-mail: zhukaiguang@jlu.edu.cn;liuxs@jlu.edu.cn
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Cite this article:
Jun Zhang(张军), Tong Qi(齐桐), Xue-Fei Pan(潘雪飞), Jing Guo(郭静), Kai-Guang Zhu(朱凯光), Xue-Shen Liu(刘学深) Helicity of harmonic generation and attosecond polarization with bichromatic circularly polarized laser fields 2019 Chin. Phys. B 28 103204
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