中国物理B ›› 2020, Vol. 29 ›› Issue (8): 83201-083201.doi: 10.1088/1674-1056/ab961c

• SPECIAL TOPIC—Ultracold atom and its application in precision measurement • 上一篇    下一篇

Role of potential on high-order harmonic generation from atoms irradiated by bichromatic counter-rotating circularly polarized laser fields

Xu-Xu Shen(申许许), Jun Wang(王俊), Fu-Ming Guo(郭福明), Ji-Gen Chen(陈基根), Yun-Jun Yang(杨玉军)   

  1. 1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
    2 Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou 318000, China
  • 收稿日期:2020-02-23 修回日期:2020-05-21 出版日期:2020-08-05 发布日期:2020-08-05
  • 通讯作者: Yun-Jun Yang E-mail:yangyj@jlu.edu.cn
  • 基金资助:

    Project supported by the National Key Research and Development Program of China (Grant Nos. 2019YFA0307700 and 2017YFA0403300), the National Natural Science Foundation of China (Grant Nos. 11627807, 11774175, 11534004, 11774129, 11975012, and 11604119), the Fundamental Research Funds for the Central Universities of China (Grant No. 30916011207), the Jilin Provincial Research Foundation for Basic Research, China (Grant No. 20170101153JC).

Role of potential on high-order harmonic generation from atoms irradiated by bichromatic counter-rotating circularly polarized laser fields

Xu-Xu Shen(申许许)1, Jun Wang(王俊)1, Fu-Ming Guo(郭福明)1, Ji-Gen Chen(陈基根)2, Yun-Jun Yang(杨玉军)1   

  1. 1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
    2 Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou 318000, China
  • Received:2020-02-23 Revised:2020-05-21 Online:2020-08-05 Published:2020-08-05
  • Contact: Yun-Jun Yang E-mail:yangyj@jlu.edu.cn
  • Supported by:

    Project supported by the National Key Research and Development Program of China (Grant Nos. 2019YFA0307700 and 2017YFA0403300), the National Natural Science Foundation of China (Grant Nos. 11627807, 11774175, 11534004, 11774129, 11975012, and 11604119), the Fundamental Research Funds for the Central Universities of China (Grant No. 30916011207), the Jilin Provincial Research Foundation for Basic Research, China (Grant No. 20170101153JC).

摘要:

We investigate high-order harmonic generation from atoms irradiated by bichromatic counter-rotating circularly polarized laser pulses by numerically solving the time-dependent Schrödinger equation. It is found that the minimum energy position of the harmonic spectrum and the non-integer order optical radiation are greatly discrepant for different atomic potentials. By analyzing the quantum trajectory of the harmonic emission, discrepancies among the harmonic spectra from different potentials can be attributed to the action of the potential on the ionized electrons. In addition, based on the influence of the driving light intensity on the overall intensity and ellipticity of higher order harmonics, the physical conditions for generating a high-intensity circularly polarized harmonic can be obtained.

关键词: high-order harmonic generation, bichromatic counter-rotating circularly polarized laser fields, channel closing effect, quantum trajectory interference

Abstract:

We investigate high-order harmonic generation from atoms irradiated by bichromatic counter-rotating circularly polarized laser pulses by numerically solving the time-dependent Schrödinger equation. It is found that the minimum energy position of the harmonic spectrum and the non-integer order optical radiation are greatly discrepant for different atomic potentials. By analyzing the quantum trajectory of the harmonic emission, discrepancies among the harmonic spectra from different potentials can be attributed to the action of the potential on the ionized electrons. In addition, based on the influence of the driving light intensity on the overall intensity and ellipticity of higher order harmonics, the physical conditions for generating a high-intensity circularly polarized harmonic can be obtained.

Key words: high-order harmonic generation, bichromatic counter-rotating circularly polarized laser fields, channel closing effect, quantum trajectory interference

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

  • 32.80.Rm
42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)