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High Power Laser Science and Engineering, Volume. 9, Issue 4, 04000e65(2021)

Coherent optical vortex generation with multiple topological charges based on a seeded free electron laser

Hao Sun1,2, Xiaofan Wang3,4、*, Chao Feng5、*, Lingjun Tu1,2, Weijie Fan1,2, and Bo Liu5、*
Author Affiliations
  • 1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai201800, China
  • 2University of Chinese Academy of Sciences, Beijing100049, China
  • 3Institute of Advanced Science Facilities, Shenzhen518000, China
  • 4Southern University of Science and Technology, College of Science, Shenzhen518055, China
  • 5Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai201210, China
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    Figures&Tables (8)
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    References (29)
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    Scheme to generate an optical vortex with multiple topological charges based on an HGHG setup.

    Fig. 1. Scheme to generate an optical vortex with multiple topological charges based on an HGHG setup.

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    Optical setup in this scheme.

    Fig. 2. Optical setup in this scheme.

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    (a) Transverse intensity and (b) corresponding phase of seed laser in the focal plane.

    Fig. 3. (a) Transverse intensity and (b) corresponding phase of seed laser in the focal plane.

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    (a) Longitudinal phase space of the electron beam after the modulator. The vertical axis p represents the energy modulation amplitude, which is defined as the ratio of the electron’s deviation from the central energy to the initial energy spread. (b) Transverse phase of the local microbunching .

    Fig. 4. (a) Longitudinal phase space of the electron beam after the modulator. The vertical axis p represents the energy modulation amplitude, which is defined as the ratio of the electron’s deviation from the central energy to the initial energy spread. (b) Transverse phase of the local microbunching .

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    (a) Evolution of the power along the radiator. (b) Evolution of the bunching factor along the radiator. (c) The longitudinal power and (d) its spectrum at the radiator exit.

    Fig. 5. (a) Evolution of the power along the radiator. (b) Evolution of the bunching factor along the radiator. (c) The longitudinal power and (d) its spectrum at the radiator exit.

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    (a) The transverse intensity and (b) its corresponding phase of radiation at the radiator exit.

    Fig. 6. (a) The transverse intensity and (b) its corresponding phase of radiation at the radiator exit.

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    (a) Evolution of the power along the radiator. (b) The transverse phase of radiation at the radiator exit.

    Fig. 7. (a) Evolution of the power along the radiator. (b) The transverse phase of radiation at the radiator exit.

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    • Table 1. Main parameters of the simulation.

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      Table 1. Main parameters of the simulation.

      ParameterValue
      Beam energy1.5 GeV
      Peak current1200 A
      Emittance1 mm $\cdot$ mrad
      Energy spread (rms)150 keV
      Seed wavelength266 nm
      Seed power2000 MW
      Modulator length0.5 m
      Radiator period0.05 m
      Radiation wavelength38 nm
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    Hao Sun, Xiaofan Wang, Chao Feng, Lingjun Tu, Weijie Fan, Bo Liu. Coherent optical vortex generation with multiple topological charges based on a seeded free electron laser[J]. High Power Laser Science and Engineering, 2021, 9(4): 04000e65

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    Paper Information

    Special Issue: XFELS

    Received: Aug. 1, 2021

    Accepted: Nov. 19, 2021

    Published Online: Dec. 30, 2021

    The Author Email: Xiaofan Wang (wangxf@mail.iasf.ac.cn), Chao Feng (fengchao@zjlab.org.cn), Bo Liu (liubo@zjlab.org.cn)

    DOI:10.1017/hpl.2021.52

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology