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Acta Optica Sinica, Volume. 43, Issue 12, 1222002(2023)

Optical System Design of MWIR Continuous Zoom Lens with High Zoom Ratio

Hongbo Zhang1, Aqi Yan2、*, Shuangliang He1, Keyi Zhang3, and Hao Wang2、**
Author Affiliations
  • 1China Astronaut Research and Training Center, Beijing 100094, China
  • 2Xi'an Institute Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, Shaanxi, China
  • 3Beijing Institute of Technology, Beijing 100081, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (12)
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    Design method

    Fig. 1. Design method

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    Schematic of the zoom lens

    Fig. 2. Schematic of the zoom lens

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    2D structural diagrams of the optical zoom system. (a) Short focal length position (focal length 25 mm,F4); (b) middle focal length position(focal length 550 mm,F4); (c) middle focal length position (focal length 900 mm,F4);(d) middle focal length position (focal length 900 mm,F5.5); (e) middle focal length position (focal length 1050 mm,F5.5);(f) long focal length position (focal length 1200 mm,F5.5)

    Fig. 3. 2D structural diagrams of the optical zoom system. (a) Short focal length position (focal length 25 mm,F4); (b) middle focal length position(focal length 550 mm,F4); (c) middle focal length position (focal length 900 mm,F4);(d) middle focal length position (focal length 900 mm,F5.5); (e) middle focal length position (focal length 1050 mm,F5.5);(f) long focal length position (focal length 1200 mm,F5.5)

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    MTF. (a) Short focal length position (focal length 25 mm,F4); (b) middle focal length position (focal length 550 mm,F4); (c) middle focal length position (focal length 900 mm,F4); (d) middle focal length position (focal length 900 mm,F5.5); (e) middle focal length position (focal length 1050 mm, F5.5); (f) long focal length position (focal length 1200 mm,F5.5)

    Fig. 4. MTF. (a) Short focal length position (focal length 25 mm,F4); (b) middle focal length position (focal length 550 mm,F4); (c) middle focal length position (focal length 900 mm,F4); (d) middle focal length position (focal length 900 mm,F5.5); (e) middle focal length position (focal length 1050 mm, F5.5); (f) long focal length position (focal length 1200 mm,F5.5)

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    Aberration curves. (a) Short focal length position(focal length 25 mm,F4); (b) middle focal length position (focal length 550 mm,F4); (c) long focal length position (focal length 1200 mm,F5.5)

    Fig. 5. Aberration curves. (a) Short focal length position(focal length 25 mm,F4); (b) middle focal length position (focal length 550 mm,F4); (c) long focal length position (focal length 1200 mm,F5.5)

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    MTF of different focal length position after temperature focusing. (a) Short focal length position (focal length 25 mm,F4,-40 ℃); (b) short focal length position (focal length 25 mm,F4,+60 ℃); (c) long focal length position (focal length 1200 mm,F5.5,-40 ℃); (d) long focal length position (focal length 1200 mm,F5.5,+60 ℃)

    Fig. 6. MTF of different focal length position after temperature focusing. (a) Short focal length position (focal length 25 mm,F4,-40 ℃); (b) short focal length position (focal length 25 mm,F4,+60 ℃); (c) long focal length position (focal length 1200 mm,F5.5,-40 ℃); (d) long focal length position (focal length 1200 mm,F5.5,+60 ℃)

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    Tolerance analysis

    Fig. 7. Tolerance analysis

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    Zoom data. (a) 25-900 mm;(b) 900-1200 mm

    Fig. 8. Zoom data. (a) 25-900 mm;(b) 900-1200 mm

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    Compact mid-wave infrared zoom imager

    Fig. 9. Compact mid-wave infrared zoom imager

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    • Table 1. Design specifications for zoom optical system

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      Table 1. Design specifications for zoom optical system

      Wavelength /nm3.7-4.8
      MW cooled infrared detector1280×1024
      Pixel size /（μm×μm）15×15
      Effective focal length（EFL）/mm25-1200
      F-numberF4（cold shield）/F5.5（warm shield）
      DistortionLess than 2%
      Temperature /℃-40-+60
      Dimensions（mm×mm×mm）≤360×238×290

    • Table 2. Focusing amount of zoom lens at long focal length position

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      Table 2. Focusing amount of zoom lens at long focal length position

      Object distanceFocusing amount /mm
      Infinity-40 ℃20 ℃+65 ℃
      +1.450-0.91

    • Table 3. Focusing amount of zoom lens at short focal length position

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      Table 3. Focusing amount of zoom lens at short focal length position

      Object distanceFocusing amount /mm
      Infinity-40 ℃20 ℃+65 ℃
      -2.420+1.59
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    Hongbo Zhang, Aqi Yan, Shuangliang He, Keyi Zhang, Hao Wang. Optical System Design of MWIR Continuous Zoom Lens with High Zoom Ratio[J]. Acta Optica Sinica, 2023, 43(12): 1222002

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    Paper Information

    Category: Optical Design and Fabrication

    Received: Feb. 9, 2023

    Accepted: Mar. 6, 2023

    Published Online: Jun. 20, 2023

    The Author Email: Aqi Yan (yanaqi@opt.ac.cn), Hao Wang (wanghao@opt.ac.cn)

    DOI:10.3788/AOS230537

    Topics

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