中国物理B ›› 2019, Vol. 28 ›› Issue (11): 113201-113201.doi: 10.1088/1674-1056/ab47f8

所属专题： SPECIAL TOPIC — Strong-field atomic and molecular physics

• SPECIAL TOPIC—Strong-field atomic and molecular physics • 上一篇    下一篇

Effect of laser intensity on quantum trajectories in the macroscopic high-order harmonic generation

Yun Pan(潘云), Fuming Guo(郭福明), Yujun Yang(杨玉军), Dajun Ding(丁大军)   

  1. 1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
    2 Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy(Jilin University), Changchun 130012, China
  • 收稿日期:2019-07-20 修回日期:2019-09-05 出版日期:2019-11-05 发布日期:2019-11-05
  • 通讯作者: Yujun Yang E-mail:yangyj@jlu.edu.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0403300), the National Natural Science Foundation of China (Grant Nos. 11627807, 11774175, 11534004, 11774129, 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), and the Science and Technology Project of the Jilin Provincial Education Department, China (Grant No. JJKH20190183KJ).

Effect of laser intensity on quantum trajectories in the macroscopic high-order harmonic generation

Yun Pan(潘云)1,2, Fuming Guo(郭福明)1,2, Yujun Yang(杨玉军)1,2, Dajun Ding(丁大军)1,2   

  1. 1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
    2 Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy(Jilin University), Changchun 130012, China
  • Received:2019-07-20 Revised:2019-09-05 Online:2019-11-05 Published:2019-11-05
  • Contact: Yujun Yang E-mail:yangyj@jlu.edu.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0403300), the National Natural Science Foundation of China (Grant Nos. 11627807, 11774175, 11534004, 11774129, 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), and the Science and Technology Project of the Jilin Provincial Education Department, China (Grant No. JJKH20190183KJ).

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摘要： We macroscopically investigate the effect of the laser intensity and gas density on quantum trajectories in the high-order harmonic generation of Ne atoms irradiated by few-cycle, 800-nm laser pulses. The time-frequency profile of the harmonics shows that the long quantum trajectory is dominant at both lower and higher gas densities for a low laser intensity. At high laser intensities, the long quantum trajectory plays an important role for lower gas densities, while the short quantum trajectory is dominant at higher gas densities. An analysis of the phase mismatch for high-order harmonic generation shows that the primary emission of the quantum trajectories is determined by dynamic changes in the laser electric field during the propagation process.

关键词: high-order harmonic generation, quantum trajectory

Abstract: We macroscopically investigate the effect of the laser intensity and gas density on quantum trajectories in the high-order harmonic generation of Ne atoms irradiated by few-cycle, 800-nm laser pulses. The time-frequency profile of the harmonics shows that the long quantum trajectory is dominant at both lower and higher gas densities for a low laser intensity. At high laser intensities, the long quantum trajectory plays an important role for lower gas densities, while the short quantum trajectory is dominant at higher gas densities. An analysis of the phase mismatch for high-order harmonic generation shows that the primary emission of the quantum trajectories is determined by dynamic changes in the laser electric field during the propagation process.

Key words: high-order harmonic generation, quantum trajectory

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)