Compact Off-axis Two-mirror Freeform Telescopic Optical System Design with Large Relative Aperture

Xin-ru ZHOU; Hua-tang SONG; Run-hui ZHU; Zhen-zhen SONG; Zhao-lou CAO; Gai-ge ZHENG; Jing-fei YE

doi:10.3788/gzxb20204910.1022002

Acta Photonica Sinica, Volume. 49, Issue 10, 1002002(2020)

Compact Off-axis Two-mirror Freeform Telescopic Optical System Design with Large Relative Aperture

Xin-ru ZHOU... Hua-tang SONG, Run-hui ZHU, Zhen-zhen SONG, Zhao-lou CAO, Gai-ge ZHENG and Jing-fei YE* |Show fewer author(s)

Author Affiliations

Department of Optoelectronic Engineering，School of Physics and Optoelectronic Engineering，Nanjing University of Information Science and Technology，Nanjing 210044，China

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Figures & Tables(8)

Fig. 1. Optical configuration of off-axis two-mirror telescopic optical system

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Fig. 2. Diagram of a split field with expansion optimization strategy

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Fig. 3. Design result of off-axis two-mirror freeform telescopic optical system with large relative aperture

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Fig. 4. MTF curves of off-axis two-mirror freeform telescopic optical system with large relative aperture

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Fig. 5. Spot diagrams of off-axis two-mirror freeform telescopic optical system with large relative aperture

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Fig. 6. Freeform wavefronts of viewing mirror and focusing mirror in three different fields

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Table 1. Design parameters of off-axis two-mirror freeform telescopic optical system

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Table 1. Design parameters of off-axis two-mirror freeform telescopic optical system

Parameters	Value
Working wavelength/nm	486~656
Relative aperture	1/3.75
Entrance pupil diameter/mm	80
Effective focal length/mm	300
Field of view/(°)	2°(H)×2°(V)
Root Mean Square (RMS) radius of spot diagram/μm	< 10
MTF at 50 lp/mm	> 0.4
Pixel size of detector/μm	10
Physical size of system(X-Y-Z)/mm³	< 100×200×300
Optical configuration	Off⁃axis two⁃mirror without obstruction

Table 2. Coefficients of freeform surface terms $x^{m} y^{n}$ of viewing and focusing mirrors

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Table 2. Coefficients of freeform surface terms $x^{m} y^{n}$ of viewing and focusing mirrors

$x^{m} y^{n}$ terms	Viewing mirror	Focusing mirror
$x$	0	0
$y$	-0.190	-0.159
$x^{2}$	-4.718×10^-4	-3.058×10^-8
$x y$	0	0
$y^{2}$	-3.554×10^-4	1.294×10^-4
$x^{3}$	0	0
$x^{2} y$	-6.939×10^-7	-6.577×10^-7
$x y^{2}$	0	0
$y^{3}$	-8.206×10^-7	-2.772×10^-7
$x^{4}$	1.257×10^-9	7.395×10^-10
$x^{3} y$	0	0
$x^{2} y^{2}$	2.478×10^-9	-1.562×10^-10
$x y^{3}$	0	0
$y^{4}$	1.556×10^-9	-7.114×10^-10

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Xin-ru ZHOU, Hua-tang SONG, Run-hui ZHU, Zhen-zhen SONG, Zhao-lou CAO, Gai-ge ZHENG, Jing-fei YE. Compact Off-axis Two-mirror Freeform Telescopic Optical System Design with Large Relative Aperture[J]. Acta Photonica Sinica, 2020, 49(10): 1002002

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Paper Information

Category: Optical Design and Fabrication

Received: Jul. 16, 2020

Accepted: Aug. 12, 2020

Published Online: Mar. 10, 2021

The Author Email: YE Jing-fei (yjfei1988@gmail.com)

DOI:10.3788/gzxb20204910.1022002

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Design parameters of off-axis two-mirror freeform telescopic optical system

Table 1. Design parameters of off-axis two-mirror freeform telescopic optical system

Table 2. Coefficients of freeform surface terms xmyn of viewing and focusing mirrors

Table 2. Coefficients of freeform surface terms xmyn of viewing and focusing mirrors

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Table 2. Coefficients of freeform surface terms $x^{m} y^{n}$ of viewing and focusing mirrors

Table 2. Coefficients of freeform surface terms $x^{m} y^{n}$ of viewing and focusing mirrors