Laser & Optoelectronics Progress, Volume. 60, Issue 21, 2122004(2023)
Design of Dual-Band Optical System with Long Back Working Distance and Continuous Zoom
Figures & Tables(18)
Fig. 5. Spot diagram of visible light system. (a) Object size is 150 mm; (b) object size is 76 mm; (c) object size is 25 mm
Fig. 6. MTF of visible light system. (a) Object size is 150 mm; (b) object size is 76 mm; (c) object size is 25 mm
Fig. 7. Spot diagram of NIR Ⅱ system. (a) Object size is 150 mm; (b) object size is 76 mm; (c) object size is 25 mm
Fig. 8. MTF of NIR Ⅱ system. (a) Object size is 150 mm; (b) object size is 76 mm; (c) object size is 25 mm
Fig. 11. Cumulative probability of MTF in 486‒656 nm. (a) Object size is 150 mm; (b) object size is 76 mm; (c) object size is 25 mm
Fig. 12. Cumulative probability of MTF in 900‒1700 nm. (a) Object size is 150 mm; (b) object size is 76 mm; (c) object size is 25 mm
Table 1. Design requirements
View tableTable 1. Design requirements
Parameter Value Object size （diagonal） /mm 150‒25 Image size （diagonal） /mm 12.29 （Visible）
15.77 （NIR Ⅱ）
Magnification （image to object） 12.2‒2.03 （Visible）
9.5‒1.58 （NIR Ⅱ）
Zoom ratio 6× Wavelength bands /nm 486‒656 （Visible）
900‒1700 （NIR Ⅱ）
Object working distance /mm 300±20 Image working distance /mm ≥60
Table 2. Initial structure of zoom system four component focal length
View tableTable 2. Initial structure of zoom system four component focal length
Group Focal length /mm Visible NIR Ⅱ G1 139.03 139.03 G2 -67.73 -67.73 G3 90.83 90.83 G4 121.05 162.50
Table 3. Spacing between groups of initial structure of zoom system
View tableTable 3. Spacing between groups of initial structure of zoom system
Spacing between groups Object size （diagonal） is 150 mm Object size （diagonal） is 76 mm Object size （diagonal） is 25 mm d1 28.44 78.67 122.33 d2 116.58 66.36 22.69 d3 76.14 60.90 11.77 d4 Visible 10.00 25.24 74.37 NIR Ⅱ 37.43 52.67 101.80
Table 4. Four component focal length of zoom system
View tableTable 4. Four component focal length of zoom system
Group Focal length /mm Visible NIR Ⅱ G1 160.70 161.00 G2 -74.90 -75.16 G3 74.94 75.10 G4 125.69 124.60
Table 5. Spacing between groups
View tableTable 5. Spacing between groups
Spacing between groups /mm Object size （diagonal） is 150 mm Object size （diagonal） is 76 mm Object size （diagonal） is 25 mm d1 3.70 74.28 133.50 d2 130.27 59.70 0.50 d3 49.80 39.18 0.50 d4 3.30 13.92 52.61
Table 6. Tolerance distribution of zoom optical system
View tableTable 6. Tolerance distribution of zoom optical system
Parameter Value range Radius of curvature /fringes ≤2 Thickness /mm ±0.02 Surface decenter /mm ±0.02 Surface tilt /mm ±0.02 Element decenter /mm ±0.02 Element tilt /（°） ±0.1 Surface irregularity /fringes ≤1 Index of refraction ±0.0001 Abbe ±0.002
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Jinsha Wang, Yan Gong, Zhishan Gao, Hanqing Zheng, Yanwei Zhang, Luhan Wang. Design of Dual-Band Optical System with Long Back Working Distance and Continuous Zoom[J]. Laser & Optoelectronics Progress, 2023, 60(21): 2122004
Paper Information
Category: Optical Design and Fabrication
Received: Oct. 13, 2022
Accepted: Nov. 30, 2022
Published Online: Oct. 26, 2023
The Author Email: Yan Gong (gongy@sibet.ac.cn)
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