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High Power Laser Science and Engineering, Volume. 12, Issue 5, 05000e61(2024)

High-repetition-rate strong-field terahertz source by optical rectification in DSTMS crystals

Zhuorui Zheng1,2, Kang Wang1,3, Hongyang Li1,4, Xianze Meng1,2, Ye Tian1,2、*, and Liwei Song1,2、*
Author Affiliations
  • 1State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China
  • 2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China
  • 3School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, China
  • 4School of Physics Science and Engineering, Tongji University, Shanghai, China
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    The experimental setup consists of an ultrafast Yb:YAG laser, a laser pulse compressor, THz generation and detection geometry. MPC, multi-pass cell; Cv. M1 and Cv. M2, concave mirrors; CM1 and CM2, chirped mirrors; BS, beam splitter; L1 and L2, lenses; NDF, neutral density filter; HDPE, high-density polyethylene; OAP1–OAP3, off-axis parabolic mirrors; TDL, time delay line; QWP, quarter wave plate; WP, Wollaston polarizer; BPD, balanced photodetector.

    Fig. 1. The experimental setup consists of an ultrafast Yb:YAG laser, a laser pulse compressor, THz generation and detection geometry. MPC, multi-pass cell; Cv. M1 and Cv. M2, concave mirrors; CM1 and CM2, chirped mirrors; BS, beam splitter; L1 and L2, lenses; NDF, neutral density filter; HDPE, high-density polyethylene; OAP1–OAP3, off-axis parabolic mirrors; TDL, time delay line; QWP, quarter wave plate; WP, Wollaston polarizer; BPD, balanced photodetector.

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    Laser spectrum and pulse duration characterization. (a) The spectrum of the Yb:YAG laser (grey), after the MPC compressor (blue) and after the DSTMS crystal (purple). (b) The pulse duration before (yellow) and after (red) the MPC compressor.

    Fig. 2. Laser spectrum and pulse duration characterization. (a) The spectrum of the Yb:YAG laser (grey), after the MPC compressor (blue) and after the DSTMS crystal (purple). (b) The pulse duration before (yellow) and after (red) the MPC compressor.

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    THz electric field (a) and the corresponding spectrum (b). The inset shows the THz focus spot. (c) The coherence length between the generated THz wave and the pump laser in the DSTMS crystal. (d) The absorption coefficient in the THz (red) and optical (purple) band in the DSTMS crystal.

    Fig. 3. THz electric field (a) and the corresponding spectrum (b). The inset shows the THz focus spot. (c) The coherence length between the generated THz wave and the pump laser in the DSTMS crystal. (d) The absorption coefficient in the THz (red) and optical (purple) band in the DSTMS crystal.

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    THz power (a) and pulse energy (b) at different repetition rates.

    Fig. 4. THz power (a) and pulse energy (b) at different repetition rates.

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    • Table 1. Parameters of pump laser and generated THz wave at different repetition rates.

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      Table 1. Parameters of pump laser and generated THz wave at different repetition rates.

      Repetition rate(kHz)Pump power(mW)THz power(μW)Pump energy(μJ)THz energy(nJ)Efficiency (‰)
      1496932.8496932.81.88
      1.25501.5850401.26801.70
      1.67501.8797.7301.2478.81.59
      2.5501.3796.5200.5318.61.59
      549878499.6156.81.57
      1050577650.577.61.54
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    Zhuorui Zheng, Kang Wang, Hongyang Li, Xianze Meng, Ye Tian, Liwei Song. High-repetition-rate strong-field terahertz source by optical rectification in DSTMS crystals[J]. High Power Laser Science and Engineering, 2024, 12(5): 05000e61

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    Paper Information

    Category: Research Articles

    Received: Jan. 27, 2024

    Accepted: Jul. 25, 2024

    Published Online: Nov. 14, 2024

    The Author Email: Ye Tian (tianye@siom.ac.cn), Liwei Song (slw@siom.ac.cn)

    DOI:10.1017/hpl.2024.50

    CSTR:32185.14.hpl.2024.50

    Topics

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