Athermalization Design of Cooled Refractive-Diffractive Hybrid Dual-Band Infrared Optical System

Huaile Nie; Shan Mao; Jianlin Zhao

doi:10.3788/AOS221965

Acta Optica Sinica, Volume. 43, Issue 8, 0822025(2023)

Athermalization Design of Cooled Refractive-Diffractive Hybrid Dual-Band Infrared Optical System

Huaile Nie, Shan Mao^*, and Jianlin Zhao

Key Laboratory of Light Field Regulation and Information Perception, Ministry of Industry and Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, Shaanxi , China

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Figures & Tables(17)

Fig. 1. Separated double-layer DOE

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$Relationship among diffraction efficiency of double-layer DOE, incident angle, and wavelength$

Fig. 2. Relationship among diffraction efficiency of double-layer DOE, incident angle, and wavelength

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Fig. 3. Relationship between largest microstructure heights and design wavelengths. (a) $H_{1}$ ; (b) $H_{2}$

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Fig. 4. Relationship between BIADE and design wavelengths

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$Diffraction efficiency distribution$

Fig. 5. Diffraction efficiency distribution

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$Relationship among diffraction efficiency of double-layer DOE, temperature, and wavelength$

Fig. 6. Relationship among diffraction efficiency of double-layer DOE, temperature, and wavelength

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Fig. 7. Solid model of infrared optical system

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Fig. 8. Structure diagram of Dewar bottle

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Fig. 9. MTF of optical system at -40, 20, and 60 ℃. (a) Middle waveband at -40 ℃; (b) long waveband at -40 ℃; (c) middle waveband at 20 ℃; (d) long waveband at 20 ℃; (e) middle waveband at 60 ℃; (f) long waveband at 60 ℃

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Fig. 10. Field curvature and distortion of optical system at -40, 20, and 60 ℃. (a) Middle waveband at -40 ℃; (b) long waveband at -40 ℃; (c) middle waveband at 20 ℃; (d) long waveband at 20 ℃; (e) middle waveband at 60 ℃; (f) long waveband at 60 ℃

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Fig. 11. Ensquared energy of optical system at -40, 20, and 60 ℃. (a) Middle waveband at -40 ℃; (b) long waveband at -40 ℃; (c) middle waveband at 20 ℃; (d) long waveband at 20 ℃; (e) middle waveband at 60 ℃; (f) long waveband at 60 ℃

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Table 1. Design indexes of infrared optical system

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Table 1. Design indexes of infrared optical system

Parameter	Index
Working waveband /μm	3.7-4.8 & 8-12
Field of view /（°）	2ω=6
Focal length /mm	100
F-number	1.25
Entrance pupil aperture /mm	80
Working temperature /℃	-40-60
MTF@17 lp/mm	≥0.7 at 3.7-4.8 μm ≥0.5 at 8-12 μm

Table 2. Parameters of infrared detector
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Table 2. Parameters of infrared detector
Parameter Index
Number of pixel arrays 320×256
Pixel size /μm 30

Table 3. Structure parameters of optical system

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Table 3. Structure parameters of optical system

Surface type			Radius /mm	Thickness /mm	Material
0	Object	Standard	Infinity	Infinity
1	Aper	Even asphere	113.6792	15.0000	IRG24
2	Aper	Binary2	194.8166	0.0100
3	Aper	Binary2	194.8166	12.0000	ZnS
4	Aper	Even asphere	179.3315	63.0249
5	Aper	Even asphere	55.8001	12.0000	IRG24
6	Aper	Even asphere	60.7549	10.3434
7	Aper	Standard	Infinity	1.0000	Ge
8	Aper	Standard	Infinity	1.0000
9	Stop	Standard	Infinity	23.0366
10	Image	Standard

Table 4. Parameters of asphere surface
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Table 4. Parameters of asphere surface
Surface Conic 4^th order term /10^-9 6^th order term /10^-12 8^th order term /10^-15
1 -1.1254 3.9686 9.7056 -2.4245
4 -3.9501 -36.377 38.322 -7.9693
5 2.7720 1522.1 1312.7 1470.7
6 6.9708 3470.9 2595.8 18225

Table 5. Parameters of diffraction surface
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Table 5. Parameters of diffraction surface
Surface Diffraction order Norm radius Coefficient p² Coefficient p⁴
2 41 and 17 100 -362.5192 -328.3769
3 -40 and -16 100 -362.5192 -328.3769

Table 6. Maximum GEO and RMS radius of spot diagram in all fields of view at different temperatures

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Table 6. Maximum GEO and RMS radius of spot diagram in all fields of view at different temperatures

Temperature /℃	Radius of medium wave /μm		Radius of long wave /μm
Temperature /℃	GEO	RMS	GEO	RMS
-40	14.619	7.112	14.585	5.924
-20	14.246	7.111	14.736	6.017
0	14.021	7.189	14.776	6.202
20	12.913	7.664	14.727	7.553
40	13.900	7.841	14.608	7.684
60	13.966	8.043	14.430	7.844

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Huaile Nie, Shan Mao, Jianlin Zhao. Athermalization Design of Cooled Refractive-Diffractive Hybrid Dual-Band Infrared Optical System[J]. Acta Optica Sinica, 2023, 43(8): 0822025

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