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Acta Optica Sinica, Volume. 43, Issue 24, 2423001(2023)

Development of Rapid Tunable Lyot Filter and Its Observation on 1 m New Vacuum Solar Telescope

Xiqun Wang1,2,3,4, Yongjun Liang5, Junping Zhang5, Jiajia Wu5, Shu Yuan6, Yu Fu7, Lü Zhuo1,2,3,4, Weijun Mao5, and Zhenyu Jin1,3,4、*
Author Affiliations
  • 1Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, Yunnan , China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Yunnan Key Laboratory of Solar Physics and Space Exploration, Kunming 650011, Yunnan , China
  • 4Engineering Laboratory on Applied Astronomy of Yunnan, Kunming 650011, Yunnan , China
  • 5Nanjing Institute of Astronomical Optics & Technology, National Astronomical Observatories, Chinese Academy of Sciences, Nanjing 210042, Jiangsu , China
  • 6National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China
  • 7Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100049, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (18)
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    References (22)
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    Figures & Tables(18)
    Optical structure of 6-stage narrow-band Lyot filter

    Fig. 1. Optical structure of 6-stage narrow-band Lyot filter

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    Normalized transmittances of pre-filter and the filter

    Fig. 2. Normalized transmittances of pre-filter and the filter

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    Control structure of liquid crystal Lyot filter

    Fig. 3. Control structure of liquid crystal Lyot filter

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    Schematic diagram of the measurement system for LCVR

    Fig. 4. Schematic diagram of the measurement system for LCVR

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    Retardance (left) and fast axis azimuth (right) of LCVR at 532.4 nm wavelength

    Fig. 5. Retardance (left) and fast axis azimuth (right) of LCVR at 532.4 nm wavelength

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    Response speed of the LCVR. (a) Voltage raise; (b) voltage drop

    Fig. 6. Response speed of the LCVR. (a) Voltage raise; (b) voltage drop

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    Measured filter transmission profile by solar spectrometer

    Fig. 7. Measured filter transmission profile by solar spectrometer

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    Theoretical and measured FWHM under different slit widths

    Fig. 8. Theoretical and measured FWHM under different slit widths

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    Measured 5324 Å spectrum and filter profile by solar spectrometer

    Fig. 9. Measured 5324 Å spectrum and filter profile by solar spectrometer

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    Setup of the experimental system

    Fig. 10. Setup of the experimental system

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    Resolution target images with and without the filter. (a) Without the filter; (b) with the filter

    Fig. 11. Resolution target images with and without the filter. (a) Without the filter; (b) with the filter

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    Filtergrams of solar photosphere at 5324.19 Å. (a) Line center; (b) 0.3 Å line wing monochromatic image

    Fig. 12. Filtergrams of solar photosphere at 5324.19 Å. (a) Line center; (b) 0.3 Å line wing monochromatic image

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    Comparison of measured line of sight velocity and HMI results. (a) Solar photosphere image observed by NVST; (b) solar photosphere image observed by HMI; (c) line of sight velocity field of NVST; (d) line of sight velocity field of HMI

    Fig. 13. Comparison of measured line of sight velocity and HMI results. (a) Solar photosphere image observed by NVST; (b) solar photosphere image observed by HMI; (c) line of sight velocity field of NVST; (d) line of sight velocity field of HMI

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    • Table 1. Characteristics of the filter

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      Table 1. Characteristics of the filter

      ParameterValue
      Center wavelength532.419 nm
      FWHM0.01 nm@532.419 nm
      Diameter40 mm
      Free spectral range0.5 nm
      Wavelength switching time≤100 ms
      Operating temperature42 ℃
      Temperature stability＜0.01 ℃

    • Table 2. Characteristics of LCVR

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      Table 2. Characteristics of LCVR

      ParameterValue
      Retarder materialNematic liquid crystal
      Operating wavelength500–870 nm （uncoated）
      Retardance range30 nm to 1λ@870 nm
      Wavefront distortion≤λ/4
      Retardance uniformity2% RMS （root mean square）
      Thickness10 mm
      Clear aperture40 mm
      Transmissivity95.5%
      Speed of optical response≤100 ms
      Voltage control range0–10 V

    • Table 3. Retardances of 7 spatial positions on LCVR surface

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      Table 3. Retardances of 7 spatial positions on LCVR surface

      Position2.0 V /（°）2.5 V /（°）3.0 V /（°）3.5 V /（°）4.0 V /（°）
      P172.010-65.097216.038169.518140.258
      P272.444-64.601216.693170.128140.747
      P380.347-59.421219.927172.468142.525
      P475.352-62.711217.830170.949141.347
      P573.229-63.963217.041170.380140.989
      P677.243-61.490218.690171.654141.943
      P773.268-64.103216.954170.282140.870
      PV8.3375.6763.8892.9502.267

    • Table 4. Characteristics of 7-meter solar spectrometer

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      Table 4. Characteristics of 7-meter solar spectrometer

      ParameterValue
      Size of diffraction grating10 mm×10 mm
      Grating linear density600 g/mm
      Focal length of collimator6000 mm
      Focal length of imaging lens7000 mm
      Entrance slit0.1-0.2 mm

    • Table 5. Key parameters of the experimental system

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      Table 5. Key parameters of the experimental system

      ParameterValue
      Pixel resolution of narrow-band channel0.0497″
      Pixel resolution of broadband channel0.0279″
      FOV （field of view） of narrow-band channel101.87″
      FOV of broadband channel57.12″
      Exposure time20–50 ms
      Synchronization accuracy1 μs
      Synchronous acquisition frame rate30 frame/s
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    Xiqun Wang, Yongjun Liang, Junping Zhang, Jiajia Wu, Shu Yuan, Yu Fu, Lü Zhuo, Weijun Mao, Zhenyu Jin. Development of Rapid Tunable Lyot Filter and Its Observation on 1 m New Vacuum Solar Telescope[J]. Acta Optica Sinica, 2023, 43(24): 2423001

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    Paper Information

    Category: Optical Devices

    Received: Mar. 14, 2023

    Accepted: May. 16, 2023

    Published Online: Dec. 8, 2023

    The Author Email: Jin Zhenyu (kim@ynao.ac.cn)

    DOI:10.3788/AOS230676

    Topics

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