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Chinese Journal of Lasers, Volume. 46, Issue 10, 1001006(2019)

Design of 780-nm High Spectral Resolution Lidar Based on Laser Diode

Yuehui Song, Yudong Zhou, Li Wang, Yufeng Wang, Huige Di, Fei Gao, Pengbo Liu, and Dengxin Hua*
Author Affiliations
  • School of Mechanical and Instrumental Engineering, Xi'an University of Technology, Xi'an, Shaanxi 710048, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (15)
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    References (30)
    Cited By (4)
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    Figures & Tables(15)
    Schematic of 780 nm HSRL system

    Fig. 1. Schematic of 780 nm HSRL system

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    Laser transmitter of 780 nm HSRL

    Fig. 2. Laser transmitter of 780 nm HSRL

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    Scattering spectra。(a) Scattering spectrum at 780 nm (288.1 K); (b) scattering spectrum at different temperatures

    Fig. 3. Scattering spectra。(a) Scattering spectrum at 780 nm (288.1 K); (b) scattering spectrum at different temperatures

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    Schematic of optical splitting system of 780 nm HSRL

    Fig. 4. Schematic of optical splitting system of 780 nm HSRL

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    Effective transmittance spectra of FPE. (a) Frequency; (b) wavelength

    Fig. 5. Effective transmittance spectra of FPE. (a) Frequency; (b) wavelength

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    Hyperfine structure of the 87Rb D2 line

    Fig. 6. Hyperfine structure of the 87Rb D2 line

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    Transmittance of the 87Rb D2F2 line at different temperatures

    Fig. 7. Transmittance of the 87Rb D2F2 line at different temperatures

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    Absorption characteristics of 87Rb D2 line. (a) Absorption cross section; (b) transmittance of D2F2 line

    Fig. 8. Absorption characteristics of 87Rb D2 line. (a) Absorption cross section; (b) transmittance of D2F2 line

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    Optical splitting system. (a) Spectrum; (b) transmittance spectrum

    Fig. 9. Optical splitting system. (a) Spectrum; (b) transmittance spectrum

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    SNR of 780 nm HSRL at night

    Fig. 10. SNR of 780 nm HSRL at night

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    SNR of 780 nm HSRL in the daytime

    Fig. 11. SNR of 780 nm HSRL in the daytime

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    • Table 1. Parameters of main elements of laser transmitter

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      Table 1. Parameters of main elements of laser transmitter

      DeviceParameterValue
      Target wavelength /nm780.24
      Linewidth (FWHM) /MHz0.6
      DFB laserMode-hop free tuning range /pm25
      Side mode supression ratio (SMSR) /dB50
      Forward current /mA180
      Output power /mW80
      Gain spectral width /nm770-790
      Amplification /dB22
      TSOAForward current /A4.5
      Input power /mW10-50
      Output power /W3

    • Table 2. Parameters of FPE

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      Table 2. Parameters of FPE

      ParameterValue
      Free spectral range /GHz98.62
      Fineness56.81
      FWHM /GHz2.8
      Intracavity loss coefficient0.001
      Surface albedo0.9462
      Refractive index of plane-parallel plate1.520
      Cavity length /mm1

    • Table 3. Parameters of the Rb absorption cell

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      Table 3. Parameters of the Rb absorption cell

      ParameterContent
      Mass of Rb atom /(10-25 kg)1.41928
      Number density of Rb atoms /(109·m-3)1.489
      Spontaneous emission rate /MHz38.12
      Center frequency /THz384.23048446
      Speed of light /(m·s-1)299792458
      Length of the cell /mm71.80
      Transmittance /%90
      Temperature /K338

    • Table 4. Simulation parameters of 780 nm HSRL

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      Table 4. Simulation parameters of 780 nm HSRL

      ParameterValue
      Central wavelength /nm780.2465
      Pulse width /ns250
      Peak power /W4
      Single pulse energy /μJ1
      Field of view /mrad0.5
      Diameter of telescope /mm400
      Photon detection efficiency0.5
      Darkcount /s-11000
      Background radiation of solar /(W·cm-2·sr-1·μm-1)5×10-3
      Bin width /μs0.2
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    Yuehui Song, Yudong Zhou, Li Wang, Yufeng Wang, Huige Di, Fei Gao, Pengbo Liu, Dengxin Hua. Design of 780-nm High Spectral Resolution Lidar Based on Laser Diode[J]. Chinese Journal of Lasers, 2019, 46(10): 1001006

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    Paper Information

    Category: laser devices and laser physics

    Received: May. 17, 2019

    Accepted: Jun. 21, 2019

    Published Online: Oct. 25, 2019

    The Author Email: Hua Dengxin (dengxinhua@xaut.edu.cn)

    DOI:10.3788/CJL201946.1001006

    Topics

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