Design of Terahertz Optical Imaging System with Large Field-of-View

Xiaogang Chen; Youping Huang; Shuyan Huang; Dongying Chen; Hao Zhang

doi:10.3788/LOP222058

Laser & Optoelectronics Progress, Volume. 60, Issue 6, 0611007(2023)

Design of Terahertz Optical Imaging System with Large Field-of-View

Xiaogang Chen, Youping Huang^*, Shuyan Huang, Dongying Chen, and Hao Zhang^**

College of Electronic Information Science, The Smart Home Information Collection and Processing on Internet of Things Laboratory of Digital Fujian, Fujian Jiangxia University, Fuzhou 350108, Fujian , China

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Figures & Tables(13)

Fig. 1. Schematic diagram of inverse telephoto structure

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Fig. 2. Distribution of focal power

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$Fitting curve distribution of TPX refractive index$

Fig. 3. Fitting curve distribution of TPX refractive index

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Fig. 4. Initial system structure and optical path diagram. (a) Initial structure; (b) final optical path diagram of system

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Fig. 5. Spot diagrams (infinite distance )

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Fig. 6. MTF curve

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Fig. 7. Field curvature and distortion. (a) Field; (b) distortion

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Fig. 8. Longitudinal aberration curve

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Fig. 9. Most sensitive tolerance operands

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Fig. 10. Cumulative probability curve of MTF

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Table 1. Design specifications of optical system
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Table 1. Design specifications of optical system
Parameter type Value
Working waveband /μm 25-35
F-number 1
Field-of-view /（°） 60
Detector pixel（W×H） 320×240
Image size /mm 16

Table 2. Refractive index distribution and fitting parameters of TPX
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Table 2. Refractive index distribution and fitting parameters of TPX
λ /μm n Schott fitting parameter Value
24 1.4568 a₀ 2.13222183
60 1.4559 a₁ 1.77417878×10^-9
300 1.46 a₂ -6.72231997
667 1.46 a₃ 4.68816822×10^-2
1000 1.465 a₄ 0.14676434
3191 1.466 a₅ 3.66331735×10^-1

Table 3. Final tolerance allocation values for optical systems

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Table 3. Final tolerance allocation values for optical systems

Element/Surface number		Radius/Fringes	Thickness /mm	Surface eccentricity /mm	Element eccentricity /mm	Surface tilt /（′）	Element tilt /（′）	Irregularity/Fringes	Index
E1	S1	3	0.05	0.05	0.05	3	3	1	0.001
E1	S2	3	0.05	0.05	0.05	3	3	0.2
E2	S3	1	0.05	0.03	0.03	3	3	0.25
E2	S4	2	0.04	0.05	0.03	3	3	0.5
E3	S5	2	0.05	0.05	0.05	3	3	0.5
E3	S6	2	0.03	0.05	0.05	3	3	0.5
E4	S7	1	0.05	0.03	0.03	3	3	0.2
E4	S8	3	0.05	0.05	0.03	3	3	1
E5	S9	3	0.05	0.05	0.05	3	3	1
E5	S10	3	0.05	0.05	0.05	3	3	1

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Xiaogang Chen, Youping Huang, Shuyan Huang, Dongying Chen, Hao Zhang. Design of Terahertz Optical Imaging System with Large Field-of-View[J]. Laser & Optoelectronics Progress, 2023, 60(6): 0611007

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