Design of Long‐Wave Infrared Planar Computational Diffraction Optical System

Zhe Wang; Zhong Sheng; Jingzhen Han; Zheng Zhen; Chengran Zhang; Dechao Ma; Mingxu Piao

doi:10.3788/AOS240515

Acta Optica Sinica, Volume. 44, Issue 14, 1422002(2024)

Design of Long‐Wave Infrared Planar Computational Diffraction Optical System

Zhe Wang¹, Zhong Sheng^2、**, Jingzhen Han², Zheng Zhen², Chengran Zhang¹, Dechao Ma¹, and Mingxu Piao^1、*

Author Affiliations

¹School of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, Jilin, China

²Beijing Institute of Remote Sensing Equipment, Beijing 100854, China

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Figures & Tables(17)

$Light path diagram of the planar diffractive optical system$

Fig. 1. Light path diagram of the planar diffractive optical system

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$Layout diagram of the planar computational diffractive optical system$

Fig. 2. Layout diagram of the planar computational diffractive optical system

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$Three-dimensional diagrams of the planar diffraction element. (a) Fresnel surface; (b) diffractive surface$

Fig. 3. Three-dimensional diagrams of the planar diffraction element. (a) Fresnel surface; (b) diffractive surface

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$MTF and spot diagram of the planar computational diffractive optical system with 1° field of view. (a) MTF; (b) spot diagram$

Fig. 4. MTF and spot diagram of the planar computational diffractive optical system with 1° field of view. (a) MTF; (b) spot diagram

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$MTF and spot diagram of the planar computational diffractive optical system with 4° field of view. (a) MTF; (b) spot diagram$

Fig. 5. MTF and spot diagram of the planar computational diffractive optical system with 4° field of view. (a) MTF; (b) spot diagram

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$Diffractive efficiency curve$

Fig. 6. Diffractive efficiency curve

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Fig. 7. Change curves of Zernike coefficients in each field of view

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Fig. 8. PSF model diagrams of different fields of view obtained by simulation software. (a) 0°; (b) 2.982°; (c) 4.000°

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Fig. 9. PSF model diagrams of different fields of view obtained by computational imaging method. (a) 0°; (b) 2.982°; (c) 4.000°

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Fig. 10. Comparison of images before and after simulated imaging restoration. (a) Pre-restored resolution image; (b) post-restored resolution image

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Fig. 11. Comparison of PSF models at the 4° field of view. (a) Object is located at infinity; (b) object is located 4 m away

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Table 1. Design specifications of the planar computational diffractive optical system
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Table 1. Design specifications of the planar computational diffractive optical system
Parameter Value
Effective focal length /mm 12
F number 1.2
Wavelength /μm 8-12
Pixel size /（μm×μm） 17×17
Resolution ratio 1280×1024
Field of view /（°） 4
Material Germanium

Table 2. Monochromatic aberration coefficients
View table
Table 2. Monochromatic aberration coefficients
Coefficient Field of view
1° 4°
$S_{I}$ 0.002477 0.002477
$S_{I I}$ -0.006780 -0.027130
$S_{I I I}$ 0.000040 0.000156
$S_{I V}$ 0.000633 0.002491
$S_{V}$ 0 0

Table 3. Diffractive efficiency evaluation results
View table
Table 3. Diffractive efficiency evaluation results
Wavelength /μm 8.0 9.6 12.0
Diffraction efficiency /% 87.51 100.00 87.60

Table 4. Zernike coefficients of each sampling point with the field of view of 4°

View table

Table 4. Zernike coefficients of each sampling point with the field of view of 4°

Sampling point	Y field /（°）	$A_{3}$	$A_{4}$	$A_{5}$	$A_{8}$	$A_{9}$
1	0	0	-0.006	0	0	0
2	1.334	-0.282	-0.001	-0.006	-0.135	0
3	1.886	-0.398	0.006	-0.011	-0.191	-0.001
4	2.310	-0.488	0.013	-0.017	-0.234	-0.001
5	2.666	-0.563	0.020	-0.023	-0.270	-0.001
6	2.982	-0.629	0.026	-0.029	-0.302	-0.002
7	3.266	-0.689	0.033	-0.034	-0.331	-0.002
8	3.528	-0.744	0.039	-0.040	-0.357	-0.002
9	3.772	-0.796	0.046	-0.046	-0.381	-0.003
10	4.000	-0.844	0.052	-0.051	-0.404	-0.003

Table 5. Evaluation result
View table
Table 5. Evaluation result
Evaluation method PSNR SSIM
Before recovery 21.4750 0.8135
After recovery（infinity） 39.7923 0.9763
After recovery（4 m） 38.8915 0.9657

Table 6. Evaluation result when field of view is 5° and 6°
View table
Table 6. Evaluation result when field of view is 5° and 6°
Evaluation method PSNR SSIM
Before recovery 21.4750 0.8135
After recovery（5°） 34.8668 0.9608
After recovery（6°） 29.9754 0.9423

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Zhe Wang, Zhong Sheng, Jingzhen Han, Zheng Zhen, Chengran Zhang, Dechao Ma, Mingxu Piao. Design of Long‐Wave Infrared Planar Computational Diffraction Optical System[J]. Acta Optica Sinica, 2024, 44(14): 1422002

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Paper Information

Category: Optical Design and Fabrication

Received: Jan. 17, 2024

Accepted: Apr. 7, 2024

Published Online: Jul. 8, 2024

The Author Email: Sheng Zhong (shengzhong8@163.com), Piao Mingxu (piaomingxu123@126.com)

DOI:10.3788/AOS240515

CSTR:32393.14.AOS240515

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Design specifications of the planar computational diffractive optical system

Table 1. Design specifications of the planar computational diffractive optical system

Table 2. Monochromatic aberration coefficients

Table 2. Monochromatic aberration coefficients

Table 3. Diffractive efficiency evaluation results

Table 3. Diffractive efficiency evaluation results

Table 4. Zernike coefficients of each sampling point with the field of view of 4°

Table 4. Zernike coefficients of each sampling point with the field of view of 4°

Table 5. Evaluation result

Table 5. Evaluation result

Table 6. Evaluation result when field of view is 5° and 6°

Table 6. Evaluation result when field of view is 5° and 6°