中国物理B ›› 2022, Vol. 31 ›› Issue (11): 114209-114209.doi: 10.1088/1674-1056/ac685b

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Yield enhancement of elliptical high harmonics driven by bicircular laser pulses

Xiaofan Zhang(张晓凡)1,† and Xiaosong Zhu(祝晓松)2,‡   

  1. 1 Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, China;
    2 Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
  • 收稿日期:2021-12-19 修回日期:2022-04-08 接受日期:2022-04-20 出版日期:2022-10-17 发布日期:2022-10-17
  • 通讯作者: Xiaofan Zhang, Xiaosong Zhu E-mail:xiaofan_z@163.com;zhuxiaosong@hust.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11904269), the Natural Science Foundation of Hubei Province, China (Grant Nos. 2021CFB300 and 2020CFB362), and Scientific Research Program of Hubei Provincial Department of Education (Grant No. B2020176).

Yield enhancement of elliptical high harmonics driven by bicircular laser pulses

Xiaofan Zhang(张晓凡)1,† and Xiaosong Zhu(祝晓松)2,‡   

  1. 1 Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, China;
    2 Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
  • Received:2021-12-19 Revised:2022-04-08 Accepted:2022-04-20 Online:2022-10-17 Published:2022-10-17
  • Contact: Xiaofan Zhang, Xiaosong Zhu E-mail:xiaofan_z@163.com;zhuxiaosong@hust.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11904269), the Natural Science Foundation of Hubei Province, China (Grant Nos. 2021CFB300 and 2020CFB362), and Scientific Research Program of Hubei Provincial Department of Education (Grant No. B2020176).

摘要: We theoretically investigate the yield enhancement of elliptical high harmonics in the interaction of molecules with bicircular laser pulses by solving the time-dependent Schrödinger equation. It is shown that by adjusting the relative intensity ratio of the two bicircular field components in specific ranges the yield of the molecular high harmonics for the plateau and cutoff regions can be respectively enhanced. To analyze this enhancement phenomenon, we calculate the weights of the electron classical trajectories. Additionally, we also study the ellipticity distribution of harmonics for different intensity ratios. We find that these enhanced harmonics are elliptically polarized, which we mainly attribute to the recombination dipole moment of the major weighted trajectories. These enhanced elliptical extreme ultraviolet and soft x-ray radiations may serve as essential tools for exploring the ultrafast dynamics in magnetic materials and chiral media.

关键词: high harmonics, extreme ultraviolet and soft x-ray, bicircular laser pulses

Abstract: We theoretically investigate the yield enhancement of elliptical high harmonics in the interaction of molecules with bicircular laser pulses by solving the time-dependent Schrödinger equation. It is shown that by adjusting the relative intensity ratio of the two bicircular field components in specific ranges the yield of the molecular high harmonics for the plateau and cutoff regions can be respectively enhanced. To analyze this enhancement phenomenon, we calculate the weights of the electron classical trajectories. Additionally, we also study the ellipticity distribution of harmonics for different intensity ratios. We find that these enhanced harmonics are elliptically polarized, which we mainly attribute to the recombination dipole moment of the major weighted trajectories. These enhanced elliptical extreme ultraviolet and soft x-ray radiations may serve as essential tools for exploring the ultrafast dynamics in magnetic materials and chiral media.

Key words: high harmonics, extreme ultraviolet and soft x-ray, bicircular laser pulses

中图分类号:  (Ultrafast processes; optical pulse generation and pulse compression)

  • 42.65.Re
42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation) 33.20.Lg (Ultraviolet spectra)