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Acta Optica Sinica, Volume. 45, Issue 10, 1011003(2025)

Design of Cooled Infrared Monolithic Annular Aperture Folded Imaging Optical System

Yingran Tong1, Wanqin Fu2, Mingxu Piao1、*, Qun Niu3, Yuanming Zhao3, Xian Zhang1, Huitian Zou1, Yichen Lou1, Haoran Wang1, and Zhiming Hu1
Author Affiliations
  • 1School of Opto-Engineering, Changchun University of Science and Technology, Changchun 130022, Jilin , China
  • 2Beijing Institute of Remote Sensing Equipment, Beijing 100854, China
  • 3The 27th Research Institute of China Electronic Technology Group Corporation, Zhengzhou 450000, Henan , China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (24)
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    References (23)
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    Figures & Tables(24)
    The schematic of the cooled infrared monolithic annular aperture folded imaging optical system

    Fig. 1. The schematic of the cooled infrared monolithic annular aperture folded imaging optical system

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    The relationship of the entrance pupil diameter and obscuration ratio

    Fig. 2. The relationship of the entrance pupil diameter and obscuration ratio

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    Schematic design of the baffle

    Fig. 3. Schematic design of the baffle

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    Flowchart of stray light analysis and design process

    Fig. 4. Flowchart of stray light analysis and design process

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    Optical layout of the cooled infrared monolithic annular aperture folded imaging optical system

    Fig. 5. Optical layout of the cooled infrared monolithic annular aperture folded imaging optical system

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    Optical-mechanical structure model diagram

    Fig. 6. Optical-mechanical structure model diagram

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    MTF curves of the cooled infrared monolithic annular aperture folded imaging optical system

    Fig. 7. MTF curves of the cooled infrared monolithic annular aperture folded imaging optical system

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    Distortion of the cooled infrared monolithic annular aperture folded imaging optical system

    Fig. 8. Distortion of the cooled infrared monolithic annular aperture folded imaging optical system

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    Chromatic focus shift curve of the cooled infrared monolithic annular aperture folded imaging optical system

    Fig. 9. Chromatic focus shift curve of the cooled infrared monolithic annular aperture folded imaging optical system

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    Detector compensation curve

    Fig. 10. Detector compensation curve

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    LT simulation model of the cooled infrared monolithic annular aperture folded imaging optical system

    Fig. 11. LT simulation model of the cooled infrared monolithic annular aperture folded imaging optical system

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    Illuminance maps and the corresponding ray path diagrams of the light spot. (a) 11°; (b) 12°; (c) 13°; (d) 16°

    Fig. 12. Illuminance maps and the corresponding ray path diagrams of the light spot. (a) 11°; (b) 12°; (c) 13°; (d) 16°

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    PST curve of double-layer light baffle at 4°‒30°

    Fig. 13. PST curve of double-layer light baffle at 4°‒30°

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    Comparison of the cooled infrared monolithic annular aperture lens. (a) Before optimization; (b) after optimization

    Fig. 14. Comparison of the cooled infrared monolithic annular aperture lens. (a) Before optimization; (b) after optimization

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    The illuminance maps and the corresponding optical path diagrams of the spot are shown after optimization. (a) 13°; (b) 14°; (c) 15°; (d) 22°

    Fig. 15. The illuminance maps and the corresponding optical path diagrams of the spot are shown after optimization. (a) 13°; (b) 14°; (c) 15°; (d) 22°

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    Cross-sectional views of the cooled infrared monolithic annular aperture folded imaging optical system’s baffle.(a) Double-layer baffle; (b) single-layer baffle

    Fig. 16. Cross-sectional views of the cooled infrared monolithic annular aperture folded imaging optical system’s baffle.(a) Double-layer baffle; (b) single-layer baffle

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    The illuminance maps of the system of single-layer baffle. (a) 15°; (b) 22°

    Fig. 17. The illuminance maps of the system of single-layer baffle. (a) 15°; (b) 22°

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    Comparison of PST curves for double-layer and single-layer baffles

    Fig. 18. Comparison of PST curves for double-layer and single-layer baffles

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    • Table 1. Parameters table of the cooled infrared monolithic annular aperture system

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      Table 1. Parameters table of the cooled infrared monolithic annular aperture system

      ParameterValue
      Effective focal length /mm102
      Effective F2.68
      Wavelength /μm3.7‒4.8
      Pixel pitch /μm24
      Field of view （FOV） /（°）7
      Back focal length /mm25.7
      Lens thickness /mm≤13

    • Table 2. Structural parameters of the optical surface

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      Table 2. Structural parameters of the optical surface

      Surface No.Surface typeRadius /mmThickness /mmMaterialSemi-diameter /mm
      1Even asphere-161.34215.40GERMANIUM27.00
      2Even asphere-57.415-13.80MIRROR27.00
      3Even asphere-83.75311.13MIRROR16.50
      4Even asphere96.896-11.78MIRROR16.50
      5Even asphere-88.25811.20MIRROR9.50
      6Even asphere-514.5692.447.70
      WindowStandardInf2.00GERMANIUM7.30
      StandardInf1.007.30
      Cold stopInf25.706.70
      ImageInf6.62

    • Table 3. Aspheric coefficients of the optical surface

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      Table 3. Aspheric coefficients of the optical surface

      Surface No.ABCDE
      12.717667×10-62.683155×10-9-1.503153×10-112.426834×10-14-1.257668×10-17
      21.303332×10-61.627886×10-9-8.034344×10-121.275863×10-14-5.438443×10-18
      3-7.855453×10-6-1.348368×10-8-2.504575×10-101.325592×10-12-1.583603×10-15
      4-8.014454×10-53.027602×10-7-8.660505×10-101.546838×10-12-1.198936×10-15
      5-8.364751×10-5-6.082801×10-8-7.881422×10-108.665958×10-11-5.042862×10-13
      6-4.570646×10-52.200717×10-6-4.588156×10-85.401305×10-10-2.207453×10-12

    • Table 4. YNI value of the optical surface

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      Table 4. YNI value of the optical surface

      Surface No.YNI
      1-4.03
      2-39.25
      3-41.01
      4-14.89
      5-4.58
      6-1.97

    • Table 5. PST data of cooled infrared monolithic annular aperture folded imaging optical system

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      Table 5. PST data of cooled infrared monolithic annular aperture folded imaging optical system

      Angle /（°）Before optimizedDouble-layer light shieldSingle-layer light shield
      61.84×10-43.89×10-56.94×10-6
      111.23×10-26.73×10-51.01×10-5
      133.76×10-21.68×10-41.87×10-5
      181.31×10-22.83×10-47.32×10-5
      214.42×10-31.69×10-42.43×10-5
      263.37×10-41.78×10-42.07×10-5

    • Table 6. Comparison of ghost image energy and imaging beam energy data

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      Table 6. Comparison of ghost image energy and imaging beam energy data

      FOV /（°）Ghost image energy /（W/mm2）Imaging beam irradiance /（W/mm2）
      12.11×10-91.91×10-3
      22.21×10-91.67×10-3
      32.04×10-91.46×10-3
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    Yingran Tong, Wanqin Fu, Mingxu Piao, Qun Niu, Yuanming Zhao, Xian Zhang, Huitian Zou, Yichen Lou, Haoran Wang, Zhiming Hu. Design of Cooled Infrared Monolithic Annular Aperture Folded Imaging Optical System[J]. Acta Optica Sinica, 2025, 45(10): 1011003

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    Paper Information

    Category: Imaging Systems

    Received: Jan. 13, 2025

    Accepted: Mar. 26, 2025

    Published Online: May. 14, 2025

    The Author Email: Mingxu Piao (piaomingxu123@126.com)

    DOI:10.3788/AOS250480

    CSTR:32393.14.AOS250480

    Topics

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