Acta Photonica Sinica, Volume. 53, Issue 3, 0322004(2024)
Design of Long-wave Infrared Athermalized Optical System with Large Aperture and Long Focal Length
Figures & Tables(12)
Fig. 1. Optical path of the optical system consisting of the main and secondary reflective mirror
Fig. 2. Optical path and initial structure of the optical system consisting of the main and secondary reflective mirrors
Fig. 3. Optical structure and path after the optimized design of the optical system
Fig. 4. MTF curve after the optimized design of the optical system
Fig. 5. Spot diagram afterthe optimized design of the optical system
Fig. 6. Distortion curve after the optimized design of the optical system
Fig. 7. Later color curve after the optimized design of the optical system
Fig. 8. Relative illumination curve after the optimized design of the optical system
Fig. 9. Modulation transfer function curve diagram after the optimized design of the optical system in the different working temperature
Table 1. Design specifications of the optical system
View tableView in ArticleTable 1. Design specifications of the optical system
Parameter Value Wavelength band/μm 8~12 Effective focal length/mm 800 Entrance pupil diameter/mm 320 Full field of view angle/（°） 0.6 F number 2.5 Pixel size/μm 25×25 Pixel 384×288 Working temperature -40 ℃~60 ℃ Total length/mm ≤400 Modulation transfer function （MTF） at 20 lp/mm ≥0.2
Table 2. Optical structure parameters after the optimized design of the optical system
View tableView in ArticleTable 2. Optical structure parameters after the optimized design of the optical system
Surface Type Radius/mm Thickness/mm Glass 1 Aspheric （STOP） -749.98 -300.76 Mirror 2 Aspheric -210.42 247.88 Mirror 3 Standard Infinite 16.67 4 Standard -32.75 13.33 Ge 5 Standard -32.30 11.69 6 Standard 37.24 6.40 ZnSe 7 Standard -406.99 2.24 8 Standard -24.15 13.33 ZnS 9 Standard -45.27 13.33 10 Standard 23.26 13.01 Ge 11 Standard 27.72 6.74 Image plane Standard Infinite -
Table 3. Change amount of image plane position after the optimized design of the optical system in the different working temperature
View tableView in ArticleTable 3. Change amount of image plane position after the optimized design of the optical system in the different working temperature
Temperature/℃ -40 -20 0 20 40 60 Change amount of image plane position/μm -9 -6 -3 0 3 6
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Yiqing CAO, Zhijuan SHEN. Design of Long-wave Infrared Athermalized Optical System with Large Aperture and Long Focal Length[J]. Acta Photonica Sinica, 2024, 53(3): 0322004
Paper Information
Category: Optical Design and Fabrication
Received: Aug. 29, 2023
Accepted: Oct. 20, 2023
Published Online: May. 16, 2024
The Author Email: CAO Yiqing (caoyiqing1987@163.com)
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