Optical design and fabrication of an all-aluminum unobscured two-mirror freeform imaging telescope

Yongjun Xie; Xianglong Mao; Jinpeng Li; Fengbiao Wang; Peng Wang; Rong Gao; Xing Li; Shangjie Ren; Zhichen Xu; Rongguang Dong

doi:10.1364/AO.379324

Applied Optics
Vol. 59,
Issue 3,
pp. 833-840
(2020)
•https://doi.org/10.1364/AO.379324

Optical design and fabrication of an all-aluminum unobscured two-mirror freeform imaging telescope

Yongjun Xie, Xianglong Mao, Jinpeng Li, Fengbiao Wang, Peng Wang, Rong Gao, Xing Li, Shangjie Ren, Zhichen Xu, and Rongguang Dong

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Yongjun Xie, Xianglong Mao, Jinpeng Li, Fengbiao Wang, Peng Wang, Rong Gao, Xing Li, Shangjie Ren, Zhichen Xu, and Rongguang Dong, "Optical design and fabrication of an all-aluminum unobscured two-mirror freeform imaging telescope," Appl. Opt. 59, 833-840 (2020)

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Abstract

Freeform optics offers more degrees of freedom to optical design that can benefit from a compact package size and a large field of view for imaging systems. Motivated by the advances in modern optical fabrication and metrology, freeform optics has been found in many applications. In this paper, we will describe the challenging optical design, fabrication, metrology, and assembly of an all-aluminum unobscured two-mirror freeform imaging telescope. The telescope has a large field of view of ${20}^\circ \times {15}^\circ $. The freeform aluminum mirrors are manufactured by diamond turning based on a feedback modification strategy. The freeform mirrors are measured by a computer-generated hologram-based interferometric null test method. All-aluminum configuration has the advantages of being athermal and cost-effective.

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Parameter	Specification
FOV	$20^{\circ} \times 15^{\circ}$
F number	3.7
Entrance pupil diameter	25 mm
System stop location	secondary mirror
Wavelength	400–700nm
Modulation transfer function(MTF)	$> 0.7$ at 78 lp/mm
Distortion	$\leq 3 %$
Pixel size	$6.4 µ m \times 6.4 µ m$
Resolution	$5120 \times 3840$

Term	$M_{1}$	$M_{2}$	Term	$M_{1}$	$M_{2}$	Term	$M_{1}$	$M_{2}$
c	0.0044	0.0039	X4Y0	3.84e-08	4.89e-10	X4Y2	9.35e-12	5.89e-14
$k$	0	0	X2Y2	7.90e-08	7.69e-10	X2Y4	7.74e-12	4.71e-14
X0Y1	−7.93e-14	−3.21e-14	X0Y4	4.21e-08	3.17e-10	X0Y6	4.39e-12	2.16e-14
X2Y0	−2.87e-04	−6.45e-05	X4Y1	−2.32e-10	−4.30e-13	X6Y1	−5.81e-14	1.22e-17
X0Y2	−2.97e-04	−8.37e-05	X2Y3	−4.77e-10	−2.42e-12	X4Y3	−3.92e-14	2.28e-15
X2Y1	−4.03e-06	3.07e-08	X0Y5	−2.82e-10	4.20e-14	X2Y5	−1.22e-13	4.93e-15
X0Y3	−3.95e-06	3.05e-08	X6Y0	1.25e-12	3.10e-15	X0Y7	−1.86e-15	3.93e-16

Parameter	Specification
FOV	$20^{\circ} \times 15^{\circ}$
F number	3.7
Entrance pupil diameter	25 mm
System stop location	secondary mirror
Wavelength	400–700nm
Modulation transfer function(MTF)	$> 0.7$ at 78 lp/mm
Distortion	$\leq 3 %$
Pixel size	$6.4 µ m \times 6.4 µ m$
Resolution	$5120 \times 3840$

Term	$M_{1}$	$M_{2}$	Term	$M_{1}$	$M_{2}$	Term	$M_{1}$	$M_{2}$
c	0.0044	0.0039	X4Y0	3.84e-08	4.89e-10	X4Y2	9.35e-12	5.89e-14
$k$	0	0	X2Y2	7.90e-08	7.69e-10	X2Y4	7.74e-12	4.71e-14
X0Y1	−7.93e-14	−3.21e-14	X0Y4	4.21e-08	3.17e-10	X0Y6	4.39e-12	2.16e-14
X2Y0	−2.87e-04	−6.45e-05	X4Y1	−2.32e-10	−4.30e-13	X6Y1	−5.81e-14	1.22e-17
X0Y2	−2.97e-04	−8.37e-05	X2Y3	−4.77e-10	−2.42e-12	X4Y3	−3.92e-14	2.28e-15
X2Y1	−4.03e-06	3.07e-08	X0Y5	−2.82e-10	4.20e-14	X2Y5	−1.22e-13	4.93e-15
X0Y3	−3.95e-06	3.05e-08	X6Y0	1.25e-12	3.10e-15	X0Y7	−1.86e-15	3.93e-16

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Applied Optics