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Acta Optica Sinica, Volume. 45, Issue 12, 1222002(2025)

Design of Cooled Long-Wave Infrared Continuous Zoom Optical System Followed by Thermal Stray Light Analysis

Tingcheng Zhang*, Xu Yan, Xiaolin Liu, and Zheng Wang
Author Affiliations
  • Beijing Institute of Space Mechanics and Electricity, Beijing 100190, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (15)
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    References (16)
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    Figures & Tables(15)
    Principle diagram of optical system

    Fig. 1. Principle diagram of optical system

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    Principle diagram of simplified optical system

    Fig. 2. Principle diagram of simplified optical system

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    Principle diagram of mechanical compensated zoom model

    Fig. 3. Principle diagram of mechanical compensated zoom model

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    Problem caused by too small f2'

    Fig. 4. Problem caused by too small f2'

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    Gauss structure layout of optical system at long focal length. (a) Short focal length; (b) middle focal length; (c) long focal length

    Fig. 5. Gauss structure layout of optical system at long focal length. (a) Short focal length; (b) middle focal length; (c) long focal length

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    Multiple configurations of zoom optical system. (a) Short focal length; (b) middle focal length; (c) long focal length

    Fig. 6. Multiple configurations of zoom optical system. (a) Short focal length; (b) middle focal length; (c) long focal length

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    Zoom paths of zoom optical system

    Fig. 7. Zoom paths of zoom optical system

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    MTF curves of zoom optical system. (a) Short focal length; (b) middle focal length; (c) long focal length

    Fig. 8. MTF curves of zoom optical system. (a) Short focal length; (b) middle focal length; (c) long focal length

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    Spot diagrams of zoom optical system. (a) Short focal length; (b) middle focal length; (c) long focal length (100% represents the diameter that contains the entire rays)

    Fig. 9. Spot diagrams of zoom optical system. (a) Short focal length; (b) middle focal length; (c) long focal length (100% represents the diameter that contains the entire rays)

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    Field curves of zoom optical system. (a) Short focal length; (b) middle focal length; (c) long focal length

    Fig. 10. Field curves of zoom optical system. (a) Short focal length; (b) middle focal length; (c) long focal length

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    Optical model for thermal stray light analysis (middle focal length)

    Fig. 11. Optical model for thermal stray light analysis (middle focal length)

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    • Table 1. Optical design parameters

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      Table 1. Optical design parameters

      QuantityValue
      Spectrum7.7‒9.5 μm
      F#3.0
      Image size9.60 mm×7.68 mm
      Maximum focal length-400 mm
      Zoom ratio20

    • Table 2. Lens data of zoom optical system

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      Table 2. Lens data of zoom optical system

      SurfaceTypeRadius ofcurvatureThicknessGlass
      ObjectSphereInfinityInfinity—
      1Sphere788.63011.755SCGERM_SPECIAL
      2Asphere-14022.8783.346—
      3Sphere245.11315.546ZNS_SPECIAL
      4Sphere222.83722.667—
      146.082—
      154.292—
      5Sphere442.0518.611SCGERM_SPECIAL
      6Asphere107.677224.336—
      62.827—
      10.000—
      7Sphere136.9987.206SCGERM_SPECIAL
      8Asphere312.15329.852—
      67.946—
      112.563—
      9SphereInfinity-60.000Mirror
      10SphereInfinity70.000Mirror
      11Sphere28.50713.548ZNS_SPECIAL
      12Asphere15.3700.536—
      13Sphere16.6814.103GaAs_SPECIAL
      14Sphere36.0969.610—
      StopSphereInfinity18.884—
      ImageSphereInfinity0—

    • Table 3. Parameters of aspheric surfaces

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      Table 3. Parameters of aspheric surfaces

      SurfaceConic4th order6th order8th order10th order
      27.0003.374×10-9-5.049×10-142.272×10-196.539×10-23
      6-0.802-1.391×10-72.991×10-11-9.835×10-151.383×10-18
      82.4006.115×10-8-4.924×10-121.945×10-15-7.335×10-19
      120.1206.684×10-6-1.586×10-81.562×10-10-3.544×10-12

    • Table 4. Results of thermal stray light analysis

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      Table 4. Results of thermal stray light analysis

      SurfaceEmission rate

      Radiant

      exitance /

      （W/m2）

      		Projected solid angleIrradiance on image plane /（W/m2）
      ShortMiddleLongShortMiddleLong
      L1_Front0.0247.0822.04×10-22.04×10-22.04×10-21.92×10-21.93×10-21.92×10-2
      L1_Rear0.0247.0822.17×10-22.17×10-22.17×10-22.04×10-22.04×10-22.04×10-2
      L2_Front0.0247.0822.29×10-22.30×10-22.29×10-22.16×10-22.17×10-22.16×10-2
      L2_Rear0.0247.0822.43×10-22.43×10-22.42×10-22.29×10-22.29×10-22.28×10-2
      L3_Front0.0247.0822.58×10-22.56×10-22.54×10-22.43×10-22.41×10-22.39×10-2
      L3_Rear0.0247.0822.70×10-22.69×10-22.68×10-22.55×10-22.53×10-22.52×10-2
      L4_Front0.0247.0822.67×10-22.82×10-22.83×10-22.51×10-22.65×10-22.66×10-2
      L4_Rear0.0247.0822.82×10-22.96×10-22.98×10-22.66×10-22.79×10-22.80×10-2
      Folder 20.0247.0824.41×10-24.53×10-24.39×10-24.15×10-24.26×10-24.13×10-2
      Folder 10.0347.0822.98×10-23.04×10-22.99×10-24.21×10-24.30×10-24.22×10-2
      L5_Front0.0347.0822.07×10-22.10×10-22.06×10-22.92×10-22.96×10-22.91×10-2
      L5_Rear0.0247.0823.32×10-23.37×10-23.31×10-23.13×10-23.17×10-23.12×10-2
      L6_Front0.0247.0823.64×10-23.69×10-23.63×10-23.43×10-23.48×10-23.42×10-2
      L6_Rear0.0247.0823.78×10-23.82×10-23.76×10-23.56×10-23.60×10-23.55×10-2
      Total—————3.99×10-14.06×10-14.01×10-1
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    Tingcheng Zhang, Xu Yan, Xiaolin Liu, Zheng Wang. Design of Cooled Long-Wave Infrared Continuous Zoom Optical System Followed by Thermal Stray Light Analysis[J]. Acta Optica Sinica, 2025, 45(12): 1222002

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    Paper Information

    Category: Optical Design and Fabrication

    Received: Mar. 10, 2025

    Accepted: Apr. 3, 2025

    Published Online: Jun. 24, 2025

    The Author Email: Tingcheng Zhang (tczhang1217@163.com)

    DOI:10.3788/AOS250722

    CSTR:32393.14.AOS250722

    Topics

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