Controlling paths of high-order harmonic generation by orthogonal two-color fields

doi:10.1088/1674-1056/ab7189

中国物理B ›› 2020, Vol. 29 ›› Issue (4): 43201-043201.doi: 10.1088/1674-1056/ab7189

• ATOMIC AND MOLECULAR PHYSICS • 上一篇下一篇

Controlling paths of high-order harmonic generation by orthogonal two-color fields

Ze-Hui Ma(马泽慧), Cai-Ping Zhang(张彩萍), Jun-Lin Ma(马俊琳), Xiang-Yang Miao(苗向阳)

1 College of Physics and Information Engineering, Shanxi Normal University, Linfen 041004, China;
2 Key Laboratory of Spectral Measurement and Analysis of Shanxi Province, Shanxi Normal University, Linfen 041004, China

收稿日期:2019-12-25 修回日期:2020-01-13 出版日期:2020-04-05 发布日期:2020-04-05
通讯作者: Cai-Ping Zhang, Xiang-Yang Miao E-mail:cpzhang880822@163.com;sxxymiao@126.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11974229, 11404204, and 11947002), the Scientific and Technological Innovation Program of Higher Education Institutions in Shanxi Province, China (Grant No. 2019L0468), the Natural Science Foundation for Young Scientists of Shanxi Province, China (Grant No. 201901D211404), and the Innovation Project for Postgraduates of Shanxi Province, China (Grant No. 2019SY310).

Controlling paths of high-order harmonic generation by orthogonal two-color fields

Ze-Hui Ma(马泽慧)^1,2, Cai-Ping Zhang(张彩萍)^1,2, Jun-Lin Ma(马俊琳)^1,2, Xiang-Yang Miao(苗向阳)^1,2

1 College of Physics and Information Engineering, Shanxi Normal University, Linfen 041004, China;
2 Key Laboratory of Spectral Measurement and Analysis of Shanxi Province, Shanxi Normal University, Linfen 041004, China

Received:2019-12-25 Revised:2020-01-13 Online:2020-04-05 Published:2020-04-05
Contact: Cai-Ping Zhang, Xiang-Yang Miao E-mail:cpzhang880822@163.com;sxxymiao@126.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11974229, 11404204, and 11947002), the Scientific and Technological Innovation Program of Higher Education Institutions in Shanxi Province, China (Grant No. 2019L0468), the Natural Science Foundation for Young Scientists of Shanxi Province, China (Grant No. 201901D211404), and the Innovation Project for Postgraduates of Shanxi Province, China (Grant No. 2019SY310).

摘要/Abstract

摘要： Controlling paths of high-order harmonic generation from H₂⁺ is theoretically investigated by numerically solving the time-dependent Schrödinger equation based on the Born-Oppenheimer approximation in orthogonal two-color fields. Our simulations show that the change of harmonic emission paths is dependent on time-dependent distribution of electrons. Compared with one-dimensional linearly polarized long wavelength laser, multiple returns are suppressed and short paths are dominant in the process of harmonic emission by two-dimensional orthogonal ω/2ω laser fields. Furthermore, not only are multiple returns weaken, but also the harmonic emission varies from twice to once in an optical cycle by orthogonal ω/1.5ω laser fields. Combining the time-frequency distributions and the time-dependent electron wave packets probability density, the mechanism of controlling paths is further explained. As a result, a 68-as isolated attosecond pulse is obtained by superposing a proper range of the harmonics.

关键词: high-order harmonic generation, orthogonal two-color fields, attosecond pulse generation

Abstract: Controlling paths of high-order harmonic generation from H₂⁺ is theoretically investigated by numerically solving the time-dependent Schrödinger equation based on the Born-Oppenheimer approximation in orthogonal two-color fields. Our simulations show that the change of harmonic emission paths is dependent on time-dependent distribution of electrons. Compared with one-dimensional linearly polarized long wavelength laser, multiple returns are suppressed and short paths are dominant in the process of harmonic emission by two-dimensional orthogonal ω/2ω laser fields. Furthermore, not only are multiple returns weaken, but also the harmonic emission varies from twice to once in an optical cycle by orthogonal ω/1.5ω laser fields. Combining the time-frequency distributions and the time-dependent electron wave packets probability density, the mechanism of controlling paths is further explained. As a result, a 68-as isolated attosecond pulse is obtained by superposing a proper range of the harmonics.

Key words: high-order harmonic generation, orthogonal two-color fields, attosecond pulse generation

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

32.80.Rm

42.65.Re (Ultrafast processes; optical pulse generation and pulse compression) 42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)

马泽慧, 张彩萍, 马俊琳, 苗向阳. Controlling paths of high-order harmonic generation by orthogonal two-color fields[J]. 中国物理B, 2020, 29(4): 43201-043201.

Ze-Hui Ma(马泽慧), Cai-Ping Zhang(张彩萍), Jun-Lin Ma(马俊琳), Xiang-Yang Miao(苗向阳). Controlling paths of high-order harmonic generation by orthogonal two-color fields[J]. Chin. Phys. B, 2020, 29(4): 43201-043201.

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Controlling paths of high-order harmonic generation by orthogonal two-color fields

Controlling paths of high-order harmonic generation by orthogonal two-color fields

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