Design of a Solar Blind Ultraviolet Refractive-Diffractive Hybrid Zoom Optical System

Yichen Song; Yufeng Tang; Tao Lai; Peiqi Yuan; Xiaowei Ding; Shan Mao; Jianlin Zhao

doi:10.3788/AOS231476

Acta Optica Sinica, Volume. 44, Issue 4, 0422003(2024)

Design of a Solar Blind Ultraviolet Refractive-Diffractive Hybrid Zoom Optical System

Yichen Song, Yufeng Tang, Tao Lai, Peiqi Yuan, Xiaowei Ding, Shan Mao^*, and Jianlin Zhao

Key Laboratory of Light-Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, Shaanxi Key Laboratory of Photonics Technology for Information, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, Shaanxi, China

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Figures & Tables(19)

Fig. 1. Principle of mechanical zoom optical system

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Fig. 2. Two-dimensional diagrams of optical system under different focal lengths. (a) f '=40 mm; (b) f '=70 mm; (c) f '=100 mm

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Fig. 3. MTF of optical system under different focal lengths. (a) f '=40 mm; (b) f '=70 mm; (c) f '=100 mm

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Fig. 4. Seidel diagrams of optical system under different focal lengths. (a) f '=40 mm; (b) f '=70 mm; (c) f '=100 mm

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Fig. 5. Two-dimensional diagrams of ultraviolet optical system under different focal lengths. (a) f '=40 mm; (b) f '=70 mm; (c) f '=100 mm

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Fig. 6. Cross section curves of even aspherical surface and standard surface

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$Diffraction efficiency and phase distribution of designed diffractive optical element. (a) Diffraction efficiency; (b) phase$

Fig. 7. Diffraction efficiency and phase distribution of designed diffractive optical element. (a) Diffraction efficiency; (b) phase

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Fig. 8. Diagrams of Q_con aspherical and standard surfaces. (a) Two-dimensional diagram; (b) three-dimensional Q_con aspherical surface

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Fig. 9. MTF of ultraviolet optical system under different focal lengths. (a) f '=40 mm; (b) f '=70 mm; (c) f '=100 mm

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Fig. 10. Field curvature and distortion of ultraviolet optical system under different focal lengths. (a) (d) f '=40 mm; (b) (e) f '=70 mm; (c) (f) f '=100 mm

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Fig. 11. Cam curves of the zoom lens

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Fig. 12. Image simulation results of ultraviolet optical system under different focal lengths. (a) Fingerprint image; (b) f '=40 mm; (c) f '=70 mm; (d) f '=100 mm

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Table 1. Design index of ultraviolet optical system
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Table 1. Design index of ultraviolet optical system
Parameter Value
Working waveband /μm 2.4-2.7
Field of view /（°） 3.8-9.4
Effective focal length（EFL）/mm 40-100
F-number 4
MTF@11 lp/mm >0.7
Distortion /% <0.1

Table 2. Structure parameters of optical system

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Table 2. Structure parameters of optical system

No.	Item	Surface type	Radius /mm	Thickness /mm	Material
0	Object	Standard	Infinity	Infinity	-
1	Aper	Standard	51.487	2.000	F_SILICA
2	Aper	Standard	64.952	46.919	-
3	Aper	Standard	-335.201	1.498	CAF2
4	Aper	Standard	66.237	1.157	-
5	Aper	Standard	73.289	1.473	F_SILICA
6	Aper	Even asphere	86.075	0.998	-
7	Aper	Even asphere	23.528	7.024	CAF2
8	Aper	Standard	-100.994	66.985	-
9	Stop	Standard	Infinity	1.005	F_SILICA
10	Aper	Q_con asphere	77.086	2.258	-
11	Aper	Binary2	Infinity	58.684	-
12	Image	Standard			-

Table 3. Parameters of aspherical surface
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Table 3. Parameters of aspherical surface
Surface No. Conic 2^ndorderterm 4^thorderterm 6^thorderterm 8^thorderterm
6 -1.707 0.012 1.894×10^-5 1.097×10^-7 -9.658×10^-10
7 -1.047 -2.627×10^-3 1.757×10^-5 1.082×10^-7 1.035×10^-9

Table 4. Parameters of diffractive surface
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Table 4. Parameters of diffractive surface
Surface No. Diffraction order Norm radius Coefficient on p² Coefficient on p⁴
11 1 100 -3.318×10^-5 5.510×10^-5

Table 5. Parameters of Q_con asphere
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Table 5. Parameters of Q_con asphere
Surface c_con a₀ a₁ a₂ a₃
10 -0.748 -7.942×10^-7 3.449×10^-9 -1.044×10^-11 1.750×10^-14

Table 6. Tolerance data of system
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Table 6. Tolerance data of system
Tolerance type Value
Refractive index 0.0008
Surface irregularity /fringes 0.25
Thickness /mm ±0.025
Abbe number /% 0.08
Element decenter /mm ±0.01
Element tilt /（°） 0.02
Test wavelength /nm 255

Table 7. Tolerance analysis results

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Table 7. Tolerance analysis results

Yield rate /%	MTF of short focal length	MTF of middle focal length	MTF of long focal length
98	0.761	0.775	0.774
90	0.805	0.817	0.812
80	0.830	0.835	0.835
50	0.870	0.868	0.873
20	0.893	0.895	0.897
10	0.902	0.903	0.905
2	0.912	0.913	0.914

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Yichen Song, Yufeng Tang, Tao Lai, Peiqi Yuan, Xiaowei Ding, Shan Mao, Jianlin Zhao. Design of a Solar Blind Ultraviolet Refractive-Diffractive Hybrid Zoom Optical System[J]. Acta Optica Sinica, 2024, 44(4): 0422003

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