Athermalization Design of Small <i>F</i>-Number Refractive-Diffractive Telephoto Objective Lens in Infrared Dual-Band

Xiaohang Tian; Changxi Xue

doi:10.3788/AOS202242.1422002

Acta Optica Sinica, Volume. 42, Issue 14, 1422002(2022)

Athermalization Design of Small F-Number Refractive-Diffractive Telephoto Objective Lens in Infrared Dual-Band

Xiaohang Tian^1,2 and Changxi Xue^1,2、*

Author Affiliations

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

²Key Laboratory of Advanced Optical System Design and Manufacturing Technology of Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, Jilin , China

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Figures & Tables(11)

Fig. 1. Continuous relief structure of MLDOE

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Fig. 2. PIDE varying with wavelength. (a) Three-dimensional diagram; (b) two-dimensional diagram

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$Structures of optical system. (a) Infrared dual-band optical system; (b) refractive diffractive hybrid lens diagram and partial enlargement$

Fig. 3. Structures of optical system. (a) Infrared dual-band optical system; (b) refractive diffractive hybrid lens diagram and partial enlargement

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Fig. 4. MTF curves of system at -40 ℃, 0 ℃, and 60 ℃. (a) Mid-band at -40 ℃; (b) long-band at -40 ℃; (c) mid-band at 0 ℃; (d) long-band at 0 ℃; (e) mid-band at 60 ℃; (f) long-band at 60 ℃

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Fig. 5. Field curvature and distortion of optical system. (a) Mid-band; (b) long-band

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Table 1. Design results of double-layer DOE
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Table 1. Design results of double-layer DOE
Parameter Value
Design band /μm 3.7-4.8，8.0-12.0
Optimum design wavelength /μm 3.96，9.62
PIDE in each band /% 99.76（3.7-4.8 μm）
99.73（8.0-12.0 μm）
H₁ /μm -127.80（ZnS）
H₂ /μm 57.56（ZnSe）

Table 2. Optical design specifications

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Table 2. Optical design specifications

System	Parameter	Content
Optical system	Working band /μm	3.7-4.8，8.0-12.0
	F-number	1.1
	Focal length /mm	75
	Field of view /（°）	8
	MTF @ 29.4 lp·mm^-1	>0.5（3.7-4.8 μm）；
	MTF @ 29.4 lp·mm^-1	>0.4（8.0-12.0 μm）
	Distortion /%	≤2
Detector	Type	Vanadium oxide
	Size of area array	640×512
	Pixel /μm	17

Table 3. Parameters of optical system

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Table 3. Parameters of optical system

Surface	Type	Radius / mm	Thickness /mm	Glass material
Object	Standard	Infinity	Infinity	－
1	Standard	71.793	6.00	ZnS
2	Binary 2	48.662	0.05	－
3	Binary 2	48.662	10.00	ZnSe
Stop	Standard	142.493	79.38	－
5	Standard	24.828	6.00	Ge
6	Even sphere	23.465	1.92	－
7	Standard	Infinity	1.00	Ge
8	Standard	Infinity	1.00	－
Image	Standard	Infinity	－	－

Table 4. Diffuse spot radius for full field at different temperatures
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Table 4. Diffuse spot radius for full field at different temperatures
Temperature /℃ Diffuse spot radius of MWIR /μm Diffuse spot radius of LWIR /μm
-40 6.877 8.089
-20 6.846 8.233
0 6.839 8.524
40 7.362 8.607
60 8.218 8.653

Table 5. Tolerance data of system

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Table 5. Tolerance data of system

Tolerance type	Value
Refractive index	0.0008
Thickness /mm	±0.0375
Surface irregularity per fringe	±0.5
Abbe number /%	0.5
Surface tilt /（′）	±1.5
Element decenter /mm	±0.03
Element tilt /（′）	±2.0
Test wavelength /nm	632.8

Table 6. Results of Monte Carlo tolerance analysis
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Table 6. Results of Monte Carlo tolerance analysis
Wavelength /μm Field of view /（°） Geometry MTF average
Nominal Estimated
3.7-4.8 0 0.73 0.47
2.8 0.66 0.45
4.0 0.60 0.42
8.0-12.0 0 0.51 0.45
2.8 0.49 0.44
4.0 0.45 0.40

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Xiaohang Tian, Changxi Xue. Athermalization Design of Small F-Number Refractive-Diffractive Telephoto Objective Lens in Infrared Dual-Band[J]. Acta Optica Sinica, 2022, 42(14): 1422002

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