中国物理B ›› 2023, Vol. 32 ›› Issue (12): 124208-124208.doi: 10.1088/1674-1056/ad0144

所属专题: SPECIAL TOPIC — Optical field manipulation

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Tailoring OAM spectrum of high-order harmonic generation driven by two mixed Laguerre-Gaussian beams with nonzero radial nodes

Beiyu Wang(汪倍羽)1, Jiaxin Han(韩嘉鑫)1, and Cheng Jin(金成)1,2,†   

  1. 1 Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, China;
    2 MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing, Nanjing University of Science and Technology, Nanjing 210094, China
  • 收稿日期:2023-07-04 修回日期:2023-09-26 接受日期:2023-10-09 出版日期:2023-11-14 发布日期:2023-11-30
  • 通讯作者: Cheng Jin E-mail:cjin@njust.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos.12274230, 91950102, and 11834004) and the Funding of Nanjing University of Science and Technology (Grant No.TSXK2022D005).

Tailoring OAM spectrum of high-order harmonic generation driven by two mixed Laguerre-Gaussian beams with nonzero radial nodes

Beiyu Wang(汪倍羽)1, Jiaxin Han(韩嘉鑫)1, and Cheng Jin(金成)1,2,†   

  1. 1 Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, China;
    2 MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing, Nanjing University of Science and Technology, Nanjing 210094, China
  • Received:2023-07-04 Revised:2023-09-26 Accepted:2023-10-09 Online:2023-11-14 Published:2023-11-30
  • Contact: Cheng Jin E-mail:cjin@njust.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos.12274230, 91950102, and 11834004) and the Funding of Nanjing University of Science and Technology (Grant No.TSXK2022D005).

摘要: The extreme ultraviolet (XUV) light beam carrying orbital angular momentum (OAM) can be produced via high-order harmonic generation (HHG) due to the interaction of an intense vortex infrared laser and a gas medium. Here we show that the OAM spectrum of vortex HHG can be readily tailored by varying the radial node (from 0 to 2) in the driving laser consisting of two mixed Laguerre-Gaussian (LG) beams. We find that due to the change in spatial profile of HHG, the distribution range of the OAM spectrum can be broadened and its shape can be modified by increasing the radial node. We also show that the OAM mode range becomes much wider and its distribution shape becomes more symmetric when the harmonic order is increased from the plateau to the cutoff when the driving laser has the nonzero radial nodes. Through the map of coherence length and the evolution of harmonic field in the medium, we reveal that the favorable off-axis phase-matching conditions are greatly modified due to the change of intensity and phase distributions of driving laser with the radial node. We anticipate this work to stimulate some interests in generating the XUV vortex beam with tunable OAM spectrum through the gaseous HHG process achieved by manipulating the mode properties of the driving laser beam.

关键词: orbital angular momentum (OAM) spectrum, high-order harmonic generation, Laguerre-Gaussian beam, radial nodes, phase-matching

Abstract: The extreme ultraviolet (XUV) light beam carrying orbital angular momentum (OAM) can be produced via high-order harmonic generation (HHG) due to the interaction of an intense vortex infrared laser and a gas medium. Here we show that the OAM spectrum of vortex HHG can be readily tailored by varying the radial node (from 0 to 2) in the driving laser consisting of two mixed Laguerre-Gaussian (LG) beams. We find that due to the change in spatial profile of HHG, the distribution range of the OAM spectrum can be broadened and its shape can be modified by increasing the radial node. We also show that the OAM mode range becomes much wider and its distribution shape becomes more symmetric when the harmonic order is increased from the plateau to the cutoff when the driving laser has the nonzero radial nodes. Through the map of coherence length and the evolution of harmonic field in the medium, we reveal that the favorable off-axis phase-matching conditions are greatly modified due to the change of intensity and phase distributions of driving laser with the radial node. We anticipate this work to stimulate some interests in generating the XUV vortex beam with tunable OAM spectrum through the gaseous HHG process achieved by manipulating the mode properties of the driving laser beam.

Key words: orbital angular momentum (OAM) spectrum, high-order harmonic generation, Laguerre-Gaussian beam, radial nodes, phase-matching

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

  • 42.65.Ky
42.65.Re (Ultrafast processes; optical pulse generation and pulse compression) 78.47.jh (Coherent nonlinear optical spectroscopy) 42.65.-k (Nonlinear optics)