中国物理B ›› 2023, Vol. 32 ›› Issue (3): 33201-033201.doi: 10.1088/1674-1056/acac0f

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Phase-coherence dynamics of frequency-comb emission via high-order harmonic generation in few-cycle pulse trains

Chang-Tong Liang(梁畅通)1,2,3, Jing-Jing Zhang(张晶晶)1,2, and Peng-Cheng Li(李鹏程)1,2,†   

  1. 1 Research Center for Advanced Optics and Photoelectronics, Department of Physics, College of Science, Shantou University, Shantou 515063, China;
    2 Key Laboratory of Intelligent Manufacturing Technology of the Ministry of Education, Shantou University, Shantou 515063, China;
    3 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
  • 收稿日期:2022-09-30 修回日期:2022-11-24 接受日期:2022-12-16 出版日期:2023-02-14 发布日期:2023-02-21
  • 通讯作者: Peng-Cheng Li E-mail:pchli@stu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12074239 and 91850209), the Natural Science Foundation of Guangdong Province, China (Grant Nos. 2020A1515010927 and 2020ST084), the Fund from the Department of Education of Guangdong Province, China (Grant Nos. 2019KTSCX038 and 2020KCXTD012), and the Fund from Shantou University (Grant No. NTF18030).

Phase-coherence dynamics of frequency-comb emission via high-order harmonic generation in few-cycle pulse trains

Chang-Tong Liang(梁畅通)1,2,3, Jing-Jing Zhang(张晶晶)1,2, and Peng-Cheng Li(李鹏程)1,2,†   

  1. 1 Research Center for Advanced Optics and Photoelectronics, Department of Physics, College of Science, Shantou University, Shantou 515063, China;
    2 Key Laboratory of Intelligent Manufacturing Technology of the Ministry of Education, Shantou University, Shantou 515063, China;
    3 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
  • Received:2022-09-30 Revised:2022-11-24 Accepted:2022-12-16 Online:2023-02-14 Published:2023-02-21
  • Contact: Peng-Cheng Li E-mail:pchli@stu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12074239 and 91850209), the Natural Science Foundation of Guangdong Province, China (Grant Nos. 2020A1515010927 and 2020ST084), the Fund from the Department of Education of Guangdong Province, China (Grant Nos. 2019KTSCX038 and 2020KCXTD012), and the Fund from Shantou University (Grant No. NTF18030).

摘要: Frequency-comb emission via high-order harmonic generation (HHG) provides an alternative method for the coherent vacuum ultraviolet (VUV) and extreme ultraviolet (XUV) radiation at ultrahigh repetition rates. In particular, the temporal and spectral features of the HHG were shown to carry profound insight into frequency-comb emission dynamics. Here we present an ab initio investigation of the temporal and spectral coherence of the frequency comb emitted in HHG of He atom driven by few-cycle pulse trains. We find that the emission of frequency combs features a destructive and constructive coherences caused by the phase interference of HHG, leading to suppression and enhancement of frequency-comb emission. The results reveal intriguing and substantially different nonlinear optical response behaviors for frequency-comb emission via HHG. The dynamical origin of frequency-comb emission is clarified by analyzing the phase coherence in HHG processes in detail. Our results provide fresh insight into the experimental realization of selective enhancement of frequency comb in the VUV-XUV regimes.

关键词: high-order harmonic generation, frequency comb, time-dependent Schrödinger equation, intense laser field systems

Abstract: Frequency-comb emission via high-order harmonic generation (HHG) provides an alternative method for the coherent vacuum ultraviolet (VUV) and extreme ultraviolet (XUV) radiation at ultrahigh repetition rates. In particular, the temporal and spectral features of the HHG were shown to carry profound insight into frequency-comb emission dynamics. Here we present an ab initio investigation of the temporal and spectral coherence of the frequency comb emitted in HHG of He atom driven by few-cycle pulse trains. We find that the emission of frequency combs features a destructive and constructive coherences caused by the phase interference of HHG, leading to suppression and enhancement of frequency-comb emission. The results reveal intriguing and substantially different nonlinear optical response behaviors for frequency-comb emission via HHG. The dynamical origin of frequency-comb emission is clarified by analyzing the phase coherence in HHG processes in detail. Our results provide fresh insight into the experimental realization of selective enhancement of frequency comb in the VUV-XUV regimes.

Key words: high-order harmonic generation, frequency comb, time-dependent Schrödinger equation, intense laser field systems

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

  • 32.80.Rm
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) 42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)