中国物理B ›› 2025, Vol. 34 ›› Issue (8): 83301-083301.doi: 10.1088/1674-1056/add00a

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Theoretical investigation of elliptical high-order harmonic generation from H2+ in two-color cross-linearly-polarized laser fields

Cai-Ping Zhang(张彩萍)1,2, Si-Hui Wang(王思慧)1,2, Yu-Zhi Chen(陈育之)1,2, Xin-Ru Du(杜欣茹)1,2, and Xiang-Yang Miao(苗向阳)1,2,†   

  1. 1 College of Physics and Information Engineering, Shanxi Normal University, Taiyuan 030031, China;
    2 Key Laboratory of Spectral Measurement and Analysis of Shanxi Province, Shanxi Normal University, Taiyuan 030031, China
  • 收稿日期:2025-02-14 修回日期:2025-03-31 接受日期:2025-04-24 出版日期:2025-07-17 发布日期:2025-08-12
  • 通讯作者: Xiang-Yang Miao E-mail:sxxymiao@126.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11974229, 12204291, and 11404204) and the Fund from Graduate Students of Shanxi Normal University, China (Grant No. 2023XSY044).

Theoretical investigation of elliptical high-order harmonic generation from H2+ in two-color cross-linearly-polarized laser fields

Cai-Ping Zhang(张彩萍)1,2, Si-Hui Wang(王思慧)1,2, Yu-Zhi Chen(陈育之)1,2, Xin-Ru Du(杜欣茹)1,2, and Xiang-Yang Miao(苗向阳)1,2,†   

  1. 1 College of Physics and Information Engineering, Shanxi Normal University, Taiyuan 030031, China;
    2 Key Laboratory of Spectral Measurement and Analysis of Shanxi Province, Shanxi Normal University, Taiyuan 030031, China
  • Received:2025-02-14 Revised:2025-03-31 Accepted:2025-04-24 Online:2025-07-17 Published:2025-08-12
  • Contact: Xiang-Yang Miao E-mail:sxxymiao@126.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11974229, 12204291, and 11404204) and the Fund from Graduate Students of Shanxi Normal University, China (Grant No. 2023XSY044).

摘要: We theoretically investigate the elliptical high-order harmonic generation from H$_{2}^{+}$ in two-color cross-linearly-polarized laser fields by numerically solving the two-dimensional time-dependent Schrödinger equation. Numerical simulations show that the crossing-angle-dependent harmonic ellipticity exhibits a prominent antisymmetric structure, which tends to disappear as the internuclear distance increases. Furthermore, ground-state electrons experience resonant transitions to the first excited state at larger internuclear distances, where the disruption of symmetric electron motion suppresses the antisymmetric structure. Additionally, a near-circularly-polarized attosecond pulse can be obtained by modulating the crossing angle.

关键词: harmonic ellipticity, molecular ions, excited state, attosecond pulse

Abstract: We theoretically investigate the elliptical high-order harmonic generation from H$_{2}^{+}$ in two-color cross-linearly-polarized laser fields by numerically solving the two-dimensional time-dependent Schrödinger equation. Numerical simulations show that the crossing-angle-dependent harmonic ellipticity exhibits a prominent antisymmetric structure, which tends to disappear as the internuclear distance increases. Furthermore, ground-state electrons experience resonant transitions to the first excited state at larger internuclear distances, where the disruption of symmetric electron motion suppresses the antisymmetric structure. Additionally, a near-circularly-polarized attosecond pulse can be obtained by modulating the crossing angle.

Key words: harmonic ellipticity, molecular ions, excited state, attosecond pulse

中图分类号:  (Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))

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