• Acta Optica Sinica
  • Vol. 43, Issue 12, 1222002 (2023)
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
  • show less
    DOI: 10.3788/AOS230537 Cite this Article Set citation alerts
    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 Copy Citation Text show less
    Design method
    Fig. 1. Design method
    Schematic of the zoom lens
    Fig. 2. Schematic of the zoom lens
    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)
    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)
    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)
    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 ℃)
    Tolerance analysis
    Fig. 7. Tolerance analysis
    Zoom data. (a) 25-900 mm;(b) 900-1200 mm
    Fig. 8. Zoom data. (a) 25-900 mm;(b) 900-1200 mm
    Compact mid-wave infrared zoom imager
    Fig. 9. Compact mid-wave infrared zoom imager
    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 1. Design specifications for zoom optical system
    Object distanceFocusing amount /mm
    Infinity-40 ℃20 ℃+65 ℃
    +1.450-0.91
    Table 2. Focusing amount of zoom lens at long focal length position
    Object distanceFocusing amount /mm
    Infinity-40 ℃20 ℃+65 ℃
    -2.420+1.59
    Table 3. Focusing amount of zoom lens at short focal length position
    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
    Download Citation