Substrate Material Selection Method for Dual-Band Multilayer Diffractive Optical Elements and Its Application in the Zoom System

Bo Zhang; Qingfeng Cui; Mingxu Piao; Yang Hu; Lin Sun

doi:10.3788/AOS202040.0605001

Acta Optica Sinica, Volume. 40, Issue 6, 0605001(2020)

Substrate Material Selection Method for Dual-Band Multilayer Diffractive Optical Elements and Its Application in the Zoom System

Bo Zhang, Qingfeng Cui^*, Mingxu Piao, Yang Hu, and Lin Sun

Author Affiliations

School of Opto-Electronic Engineering, Changchun University of Science and Technology, Changchun, Jilin 130022, China

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Figures & Tables(11)

$Schematic diagram of double-layer diffractive optical element$

Fig. 1. Schematic diagram of double-layer diffractive optical element

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Fig. 2. PIDE for different combinations in MWIR/LWIR dual-band versus incident angle

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Fig. 3. Initial system. (a) Short focal length; (b) middle focal length; (c) long focal length

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$Final designed system. (a) Short focal length; (b) middle focal length; (c) long focal length; (d) diffraction hybrid lens diagram and partial enlargement of multilayer diffraction element$

Fig. 4. Final designed system. (a) Short focal length; (b) middle focal length; (c) long focal length; (d) diffraction hybrid lens diagram and partial enlargement of multilayer diffraction element

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Fig. 5. Design MTF of the dual-band infrared zoom system. (a1-a3) MWIR; (b1-b3) LWIR

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Table 1. Comprehensive PIDE difference for different substrate material combinations
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Table 1. Comprehensive PIDE difference for different substrate material combinations
Substrate material combination Δ $\begin{matrix} {\bar{η}}^{C}_{m} \end{matrix}$ (λ) /%
ZNSE-ZNS 0.39
GASIR1-ZNS 0.47
GASIR1-ZNSE 0.56
IRG26-ZNS 2.68
IRG26-ZNSE 13.70
GE-ZNS 37.74

Table 2. System data of dual-band infrared zoom system with MLDOE

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Table 2. System data of dual-band infrared zoom system with MLDOE

Surface	Type	Radius /mm	Thickness /mm	Glass
0	Standard	Infinity	Infinity
1	Standard	351.782	17	ZNS
2	Binary 2^a	278.522	0.5
3	Binary 2^a	278.522	20	ZNSE
4	Standard	1318.34	d₄, zoom
5	Standard	-300.987	8	IRG26
6	Standard	176.598	d₆, zoom
7	EA^b	89.258	9	GASIR1
8	Standard	-1664.62	3.4
9	EA^b	208.684	7.5	ZNS
10	Standard	117.879	d₁₀, zoom
Stop	Standard	Infinity	0.5
12	Standard	31.310	5	ZNSE
13	EA^b	35.101	1.6
14	EA^b	86.123	5.5	ZNS
15	Standard	46.518	30
16^c	EA^b	15.473	6.5	ZNSE
17^c	EA^b	17.255	6.89
Image	Standard	Infinity	-	-
Note: Binary 2^a is diffractive surface, of which the diffractive phase coefficient A₁ for the surface 2 is 99.552, and diffractive phase coefficient A₁ for the surface 3 is -99.552; EA^b is the even asphere; 16^c and 17^c are the surfaces of the detector wind.

Table 3. Even asphere aspheric coefficient of dual-band infrared zoom system

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Table 3. Even asphere aspheric coefficient of dual-band infrared zoom system

Surface	Polynomial coefficient
Surface	α₂	α₃	α₄
7	6.93662×10^-8	-1.43459×10^-10	8.43067×10^-15
9	-4.42025×10^-7	2.58981×10^-10	-2.74896×10^-14
13	6.32016×10^-7	1.05777×10^-8	1.20469×10^-10
14	7.95772×10^-7	1.65771×10^-8	1.07461×10^-10
16	6.31433×10^-6	6.80261×10^-8	-6.01009×10^-10
17	2.71964×10^-5	1.91906×10^-7	-7.22714×10^-9

Table 4. Distance between the lens groups for different focal lengths
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Table 4. Distance between the lens groups for different focal lengths
Parameter Configuration
Short Middle Long
EFL /mm 20 120 200
d₄ /mm 59.542 168.043 175.680
d₆ /mm 174.278 34.740 0.500
d₁₀ /mm 4.787 35.825 62.428

Table 5. Tolerance data of system

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Table 5. Tolerance data of system

Tolerance type	Tolerance parameter
Radius	±3 Fringe
Surface irregularity	±1 Fringe
Thickness /mm	±0.03
Surface tilt/(')	±2
Element decenter /mm	±0.03
Element tilt/(')	±2
Aspheric PV value /μm	±0.3
Refractive index	0.0005
Abbe number /%	0.8
Test wavelength /nm	632.8

Table 6. Design and actual values of MTF for the dual-band infrared zoom system

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Table 6. Design and actual values of MTF for the dual-band infrared zoom system

Field of view		0	0.7T	0.7S	1T	1S
Medium wave short focus	Design value	0.75	0.68	0.74	0.63	0.75
	Actual value	0.70	0.64	0.72	0.56	0.73
Long wave short focus	Design value	0.57	0.50	0.57	0.45	0.57
	Actual value	0.55	0.45	0.53	0.40	0.52
Medium wave medium focus	Design value	0.72	0.72	0.72	0.69	0.70
	Actual value	0.68	0.67	0.70	0.63	0.67
Long wave medium focus	Design value	0.55	0.55	0.56	0.55	0.56
	Actual value	0.52	0.51	0.52	0.50	0.52
Medium wave long focus	Design value	0.75	0.65	0.72	0.59	0.70
	Actual value	0.73	0.60	0.67	0.52	0.65
Long wave long focus	Design value	0.55	0.49	0.55	0.45	0.55
	Actual value	0.52	0.41	0.50	0.35	0.49

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Bo Zhang, Qingfeng Cui, Mingxu Piao, Yang Hu, Lin Sun. Substrate Material Selection Method for Dual-Band Multilayer Diffractive Optical Elements and Its Application in the Zoom System[J]. Acta Optica Sinica, 2020, 40(6): 0605001

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