Design of a Coaxial Catadioptric Telescope Objective with a Large Relative Aperture and Long Focal Length

Shen Zhijuan; Cao Yiqing

doi:10.3788/LOP202158.0108002

Journals >Laser & Optoelectronics Progress >Volume 58 >Issue 1 >Page 108002 > Article

Laser & Optoelectronics Progress
Vol. 58, Issue 1, 108002 (2021)

Design of a Coaxial Catadioptric Telescope Objective with a Large Relative Aperture and Long Focal Length

Shen Zhijuan^1、2 and Cao Yiqing^2、*

Author Affiliations

¹School of Opto-Electronic and Communication Engineering, Xiamen University of Technology, Xiamen, Fujian 361024, China

²School of Mechanical and Electrical Engineering, Putian University, Putian, Fujian 351100, China

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DOI: 10.3788/LOP202158.0108002 Cite this Article Set citation alerts

Shen Zhijuan, Cao Yiqing. Design of a Coaxial Catadioptric Telescope Objective with a Large Relative Aperture and Long Focal Length[J]. Laser & Optoelectronics Progress, 2021, 58(1): 108002 Copy Citation Text

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Fig. 1. Preliminary selection structure and optical path schematic of objective lens

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Fig. 2. Optical scheme of double reflective mirrors

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Fig. 3. Relationship between M and the obstruction ratio

α

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Fig. 4. Structure diagram of the optimized telescope objective

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Fig. 7. Goodness estimate curve

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Parameter	Value
Wavelength /nm	400-700
Entrance pupil diameter /mm	500
Relative aperture	1/1.8
Total length /mm	≤550
Root-mean-square radius of spot diagram /μm	≤8
Modulation transfer function (MTF) at 107.5 lp/mm	≥0.4

Table 1. Design specifications of telescope objective

Surface	Radius/mm	Thickness/mm	Refractiveindex	Abbe number
Object plane	Infinity	Infinity
STO	Infinity	18.00
2	2681.00	22.83	1.69350	53.3476
3	-23169.13	16.67
4	-2579.22	26.33	1.62041	60.2917
5	-11368.41	350.55
6	-1299.52	33.61	1.60881	58.9215
7	-1415.40	-33.61	Mirror
8	-1299.52	-350.55
9	-11368.41	-26.33	1.62041	60.2917
10	-2579.22	26.33	Mirror
11	-11368.41	342.35
12	-394.19	9.17	1.77250	49.6013
13	-76.73	4.92
14	-59.10	9.72	1.61659	36.6281
15	-126.16	45.00
Image plane	Infinity

Table 2. Optical parameters of optimized telescope objective

Tolerance type		Value
Surface tolerance	Radius per fringe	-8-8
	Thickness /mm	-0.1-0.1
	Eccentric distance along X and Y directions /mm	-0.015-0.015
	Tilt distance along X and Y directions /mm	-0.015-0.015
Element tolerance	Eccentric distance along X and Y directions /mm	-0.01-0.01
	Tilt angle along X and Y directions /(°)	-0.01-0.01
	Refraction index tolerance	-0.0004-0.0004
	Abbe number tolerance /%	-0.5-0.5

Table 3. Manufacturing and alignment tolerances of optical elements telescope objective

Shen Zhijuan, Cao Yiqing. Design of a Coaxial Catadioptric Telescope Objective with a Large Relative Aperture and Long Focal Length[J]. Laser & Optoelectronics Progress, 2021, 58(1): 108002

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