中国物理B ›› 2024, Vol. 33 ›› Issue (3): 34212-034212.doi: 10.1088/1674-1056/ad10fb

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Tunable spectral continuous shift of high-order harmonic generation in atoms by a plasmon-assisted shaping pulse

Yuan Wang(王源)1,2, Yulong Li(李玉龙)3, Yue Qiao(乔月)1,2, Na Gao(高娜)1,2, Fu-Ming Guo(郭福明)1,2, Zhou Chen(陈洲)1,2, Lan-Hai He(赫兰海)1,2,†, Yu-Jun Yang(杨玉军)1,2,‡, Xi Zhao(赵曦)4,§, and Jun Wang(王俊)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;
    3 Beijing Institute of Space Launch Technology, Beijing 100076, China;
    4 School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China
  • 收稿日期:2023-09-19 修回日期:2023-11-16 接受日期:2023-11-30 出版日期:2024-02-22 发布日期:2024-02-29
  • 通讯作者: Lan-Hai He, Yu-Jun Yang, Xi Zhao, Jun Wang E-mail:helanhai@jlu.edu.cn;yangyj@jlu.edu.cn;zhaoxi719@snnu.edu.cn;wangjun86@jlu.edu.cn
  • 基金资助:
    This project was supported by the National Key Research and Development Program of China (Grant Nos. 2022YFE134200 and 2019YFA0307700), the National Natural Science Foundation of China (Grant Nos. 11604119, 12104177, 11904192, 12074145, and 11704147), and the Fundamental Research Funds for the Central Universities (Grant Nos. GK202207012 and QCYRCXM-2022-241).

Tunable spectral continuous shift of high-order harmonic generation in atoms by a plasmon-assisted shaping pulse

Yuan Wang(王源)1,2, Yulong Li(李玉龙)3, Yue Qiao(乔月)1,2, Na Gao(高娜)1,2, Fu-Ming Guo(郭福明)1,2, Zhou Chen(陈洲)1,2, Lan-Hai He(赫兰海)1,2,†, Yu-Jun Yang(杨玉军)1,2,‡, Xi Zhao(赵曦)4,§, and Jun Wang(王俊)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;
    3 Beijing Institute of Space Launch Technology, Beijing 100076, China;
    4 School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China
  • Received:2023-09-19 Revised:2023-11-16 Accepted:2023-11-30 Online:2024-02-22 Published:2024-02-29
  • Contact: Lan-Hai He, Yu-Jun Yang, Xi Zhao, Jun Wang E-mail:helanhai@jlu.edu.cn;yangyj@jlu.edu.cn;zhaoxi719@snnu.edu.cn;wangjun86@jlu.edu.cn
  • Supported by:
    This project was supported by the National Key Research and Development Program of China (Grant Nos. 2022YFE134200 and 2019YFA0307700), the National Natural Science Foundation of China (Grant Nos. 11604119, 12104177, 11904192, 12074145, and 11704147), and the Fundamental Research Funds for the Central Universities (Grant Nos. GK202207012 and QCYRCXM-2022-241).

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摘要： We delve into the phenomenon of high-order harmonic generation within a helium atom under the influence of a plasmon-assisted shaping pulse. Our findings reveal an intriguing manipulation of the frequency peak position in the harmonic emission by adjusting the absolute phase parameter within the frequency domain of the shaping pulse. This phenomenon holds potential significance for experimental setups necessitating precisely tuned single harmonics. Notably, we observe a modulated shift in the created harmonic photon energy, spanning an impressive range of 1.2 eV. This frequency peak shift is rooted in the asymmetry exhibited by the rising and falling edges of the laser pulse, directly influencing the position of the peak frequency emission. Our study quantifies the dependence of this tuning range and the asymmetry of the laser pulse, offering valuable insights into the underlying mechanisms driving this phenomenon. Furthermore, our investigation uncovers the emergence of semi-integer order harmonics as the phase parameter is altered. We attribute this discovery to the intricate interference between harmonics generated by the primary and secondary return cores. This observation introduces an innovative approach for generating semi-integer order harmonics, thus expanding our understanding of high-order harmonic generation. Ultimately, our work contributes to the broader comprehension of complex phenomena in laser-matter interactions and provides a foundation for harnessing these effects in various applications, particularly those involving precise spectral control and the generation of unique harmonic patterns.

关键词: high-order harmonic, semi-integer-order, spectra shift, inhomogeneous field

Abstract: We delve into the phenomenon of high-order harmonic generation within a helium atom under the influence of a plasmon-assisted shaping pulse. Our findings reveal an intriguing manipulation of the frequency peak position in the harmonic emission by adjusting the absolute phase parameter within the frequency domain of the shaping pulse. This phenomenon holds potential significance for experimental setups necessitating precisely tuned single harmonics. Notably, we observe a modulated shift in the created harmonic photon energy, spanning an impressive range of 1.2 eV. This frequency peak shift is rooted in the asymmetry exhibited by the rising and falling edges of the laser pulse, directly influencing the position of the peak frequency emission. Our study quantifies the dependence of this tuning range and the asymmetry of the laser pulse, offering valuable insights into the underlying mechanisms driving this phenomenon. Furthermore, our investigation uncovers the emergence of semi-integer order harmonics as the phase parameter is altered. We attribute this discovery to the intricate interference between harmonics generated by the primary and secondary return cores. This observation introduces an innovative approach for generating semi-integer order harmonics, thus expanding our understanding of high-order harmonic generation. Ultimately, our work contributes to the broader comprehension of complex phenomena in laser-matter interactions and provides a foundation for harnessing these effects in various applications, particularly those involving precise spectral control and the generation of unique harmonic patterns.

Key words: high-order harmonic, semi-integer-order, spectra shift, inhomogeneous field

中图分类号:  (Frequency conversion; harmonic generation, including higher-order harmonic generation)

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