中国物理B ›› 2018, Vol. 27 ›› Issue (5): 53202-053202.doi: 10.1088/1674-1056/27/5/053202

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Modulation of multiphoton resonant high-order harmonic spectra driven by two frequency-comb fields

Yuanyuan Zhao(赵媛媛), Di Zhao(赵迪), Chen-Wei Jiang(蒋臣威), Fu-li Li(李福利)   

  1. School of Science, Xi'an Jiaotong University, Xi'an 710049, China
  • 收稿日期:2017-12-27 修回日期:2018-01-24 出版日期:2018-05-05 发布日期:2018-05-05
  • 通讯作者: Di Zhao E-mail:d.zhao@mail.xjtu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos.11504288,11374239,11534008,and 91536115) and the Fundamental Research Funds for the Central Universities,China.

Modulation of multiphoton resonant high-order harmonic spectra driven by two frequency-comb fields

Yuanyuan Zhao(赵媛媛), Di Zhao(赵迪), Chen-Wei Jiang(蒋臣威), Fu-li Li(李福利)   

  1. School of Science, Xi'an Jiaotong University, Xi'an 710049, China
  • Received:2017-12-27 Revised:2018-01-24 Online:2018-05-05 Published:2018-05-05
  • Contact: Di Zhao E-mail:d.zhao@mail.xjtu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos.11504288,11374239,11534008,and 91536115) and the Fundamental Research Funds for the Central Universities,China.

摘要: The frequency-comb structure in the extreme ultraviolet (XUV) and vacuum ultraviolet (VUV) regions can be realized by the high-order harmonic generation (HHG) process driven by frequency-comb fields, providing an alternative approach for the measurement of an unknown frequency in XUV or VUV. We consider the case of two driving frequency-comb fields with the same repetition frequency and the carrier frequencies of fundamental-and third-harmonics, respectively. The many-mode Floquet theorem (MMFT) is employed to provide a nonperturbative and exact treatment of the interaction between a quantum system and the frequency-comb laser fields. Multiphoton transition paths involving both fundamental-and third-harmonic photons are opened due to the coupling of the third-harmonic frequency-comb field. The multiphoton transition paths are superpositioned when the carrier-envelope-phase shifts (CEPs) fulfill the matching condition. And the interference of the multiphoton transition paths can be controlled by tuning the relative envelope delay between the fields. We find that the quasienergy structure, as well as the multiphoton resonant high-order harmonic generation (HHG) spectra, driven by the two frequency-comb fields can be coherently controlled via the interference of multiphoton transition paths. It is also found that the spectral intensities of the generated harmonics can be modulated, and the modulation behavior is harmonic-sensitive.

关键词: high-order harmonic generation, two frequency-comb laser fields, relative envelope delay

Abstract: The frequency-comb structure in the extreme ultraviolet (XUV) and vacuum ultraviolet (VUV) regions can be realized by the high-order harmonic generation (HHG) process driven by frequency-comb fields, providing an alternative approach for the measurement of an unknown frequency in XUV or VUV. We consider the case of two driving frequency-comb fields with the same repetition frequency and the carrier frequencies of fundamental-and third-harmonics, respectively. The many-mode Floquet theorem (MMFT) is employed to provide a nonperturbative and exact treatment of the interaction between a quantum system and the frequency-comb laser fields. Multiphoton transition paths involving both fundamental-and third-harmonic photons are opened due to the coupling of the third-harmonic frequency-comb field. The multiphoton transition paths are superpositioned when the carrier-envelope-phase shifts (CEPs) fulfill the matching condition. And the interference of the multiphoton transition paths can be controlled by tuning the relative envelope delay between the fields. We find that the quasienergy structure, as well as the multiphoton resonant high-order harmonic generation (HHG) spectra, driven by the two frequency-comb fields can be coherently controlled via the interference of multiphoton transition paths. It is also found that the spectral intensities of the generated harmonics can be modulated, and the modulation behavior is harmonic-sensitive.

Key words: high-order harmonic generation, two frequency-comb laser fields, relative envelope delay

中图分类号:  (Coherent control of atomic interactions with photons)

  • 32.80.Qk
42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation) 42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)