Chinese Optics, Volume. 17, Issue 2, 374(2024)
Design of terahertz wave imaging optical system with large aperture
Fig. 1. Simplify structure and optical pass diagram using thin lens in optical system infrastructure
Fig. 2. Simplified structure and optical path diagram for initial structure of the optical system
Fig. 3. Optical structure and optical path diagram of the optical system after optimization design
Fig. 4. MTF curve diagram of the optical system after optimization design
Fig. 5. Spot diagram of the optical system after optimization design
Fig. 6. Relative illumination curve diagram of the optical system after optimization design
Fig. 7.
Table 1. Design specifications of the optical system
View tableView in ArticleTable 1. Design specifications of the optical system
Parameter Value Wavelength band/μm 30-35 Effective focal length/mm 70 Full field of view angle/(°) 8 F-number 1.4 Pixel size/μm 52×52 Pixel 240×320
Table 2. First-order optical parameter of the initial structure of the optical system (Unit: mm−1, unless otherwise stated)
View tableView in ArticleTable 2. First-order optical parameter of the initial structure of the optical system (Unit: mm−1, unless otherwise stated)
$ \varPhi_{1} $ $ \varPhi_{2} $ $ \varPhi_{3} $ $ \varPhi_{4} $ $ d_{1} $ $ d_{1} $ $ d_{3} $ −0.0157 0.0356 −0.0201 0.0264 6 mm 15.51 mm 80 mm
Table 3. Sellmeier function fitting parameters of KRS-5 and CsBr materials
View tableView in ArticleTable 3. Sellmeier function fitting parameters of KRS-5 and CsBr materials
Sellmeier fitting parameters Material KRS-5 CsBr $ {K}_{1} $ 1.8293958 0.9533786 $ L_{1} $ 2.25×10−2 8.20189243×10−3 $ {K}_{2} $ 1.6675593 0.8303809 $ L_{2} $ 6.25×10−2 2.79396908×10−2 $ {K}_{3} $ 1.1210424 2.847172 $ L_{3} $ 0.1225 1.41646892×104 $ {K}_{4} $ 4.513366×10−2 - $ L_{4} $ 0.2025 - $ {K}_{5} $ 12.380234 - $ L_{3} $ 2.70898681×104 -
Table 4. Optical structure parameters of the optical system after optimization design
View tableView in ArticleTable 4. Optical structure parameters of the optical system after optimization design
Surface Type Radius /mm Thickness /mm Material 1 Even Aspheric (STOP) −83.93 6.28 CsBr 2 Even Aspheric 46.66 0.70 3 Even Aspheric 27.45 14.98 KRS-5 4 Even Aspheric 185.48 7.65 5 Even Aspheric −27.00 17.50 CsBr 6 Standard 32.64 3.25 7 Even Aspheric 38.61 17.50 KRS-5 8 Standard 316.43 35.47 Image plane Standard Infinite
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Yi-qing CAO, Zhi-juan SHEN. Design of terahertz wave imaging optical system with large aperture[J]. Chinese Optics, 2024, 17(2): 374
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Received: Aug. 3, 2023
Accepted: Sep. 28, 2023
Published Online: Apr. 15, 2024
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