Wide field-of-view crossed Dragone optical system using anamorphic aspherical surfaces

Shingo Kashima; Masashi Hazumi; Hiroaki Imada; Nobuhiko Katayama; Tomotake Matsumura; Yutaro Sekimoto; Hajime Sugai

doi:10.1364/AO.57.004171

Applied Optics
Vol. 57,
Issue 15,
pp. 4171-4179
(2018)
•https://doi.org/10.1364/AO.57.004171

Wide field-of-view crossed Dragone optical system using anamorphic aspherical surfaces

Shingo Kashima, Masashi Hazumi, Hiroaki Imada, Nobuhiko Katayama, Tomotake Matsumura, Yutaro Sekimoto, and Hajime Sugai

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Shingo Kashima, Masashi Hazumi, Hiroaki Imada, Nobuhiko Katayama, Tomotake Matsumura, Yutaro Sekimoto, and Hajime Sugai, "Wide field-of-view crossed Dragone optical system using anamorphic aspherical surfaces," Appl. Opt. 57, 4171-4179 (2018)

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Abstract

A side-fed crossed Dragone telescope provides a wide field of view. This type of telescope is commonly employed in the measurement of cosmic microwave background polarization, which requires an image-space telecentric telescope with a large focal plane over broadband coverage. We report the design of a wide field-of-view crossed Dragone optical system using anamorphic aspherical surfaces with correction terms up to the 10th order. We achieved a Strehl ratio larger than 0.95 over $32 \times 18$ square degrees at 150 GHz. This design is an image-space telecentric and fully diffraction-limited system below 400 GHz. We discuss the optical performance in the uniformity of the axially symmetric point-spread function and telecentricity over the field of view. We also address the analysis to evaluate the polarization properties, including the instrumental polarization, extinction rate, and polarization angle rotation. This work is a part of a program to design a compact multi-color wide-field-of-view telescope for LiteBIRD, which is a next-generation cosmic microwave background (CMB) polarization satellite.

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	$C_{m} / {mm}^{- 1}$	$k_{m}$	$y_{m, 0} / mm$	$z_{m, 0} / mm$	$θ_{m} / \deg$ .
PM	$- 2.2965 \times 10^{- 4}$	−0.8524	−2616.51	1715.72	0
SM	$3.6274 \times 10^{- 4}$	−3.3990	−246.17	−56.72	73.025
FP	0	—	578.71	156.70	112.048

	$C_{m, x} / {mm}^{- 1}$	$C_{m, y} / {mm}^{- 1}$	$k_{m, x}$	$k_{m, y}$	$y_{m, 0} / mm$	$z_{m, 0} / mm$	$θ_{m} / deg.$
PM	$- 2.2989 \times 10^{- 4}$	$- 2.2119 \times 10^{- 4}$	−0.4978	−0.8094	−2604.93	1610.07	0
SM	$3.5203 \times 10^{- 4}$	$3.7695 \times 10^{- 4}$	−2.9848	−3.3552	−252.586	−172.5887	71.342
FP	0	0	—	—	541.27	169.91	112.001

	$C_{m, x} / {mm}^{- 1}$	$C_{m, y} / {mm}^{- 1}$	$k_{m, x}$	$k_{m, y}$	$y_{m, 0} / mm$	$z_{m, 0} / mm$	$θ_{m} / deg.$
PM	$- 2.4126 \times 10^{- 4}$	$- 2.1942 \times 10^{- 4}$	−0.6361	−1.0535	−2514.33	1588.89	0
SM	$3.5710 \times 10^{- 4}$	$3.8091 \times 10^{- 4}$	−4.8176	−3.5555	−211.92	−179.00	69.240
FP	0	0	–	—	543.02	230.75	111.955

	$A_{m, 2}$	$B_{m, 2}$	$A_{m, 3}$	$B_{m, 3}$	$A_{m, 4}$	$B_{m, 4}$	$A_{m, 5}$	$B_{m, 5}$
PM	$- 4.4252 \times 10^{- 12}$	−0.9958	$1.3533 \times 10^{- 20}$	−0.6486	$- 1.5402 \times 10^{- 29}$	1.2958	$- 1.9191 \times 10^{- 34}$	−0.06712
SM	$- 8.8005 \times 10^{- 14}$	0.04926	$7.6442 \times 10^{- 19}$	0.04683	$- 1.0061 \times 10^{- 26}$	0.8811	$- 7.4764 \times 10^{- 31}$	−0.5148

Material	Complex Index	Thickness	Temperature
Al [20]	$2543.4 + 2552.2 i$	1 μm	110 K
SiO [21–24]	$2 + 8 \times 10^{- 4} i$	25 nm	room

Wide field-of-view crossed Dragone optical system using anamorphic aspherical surfaces

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Abstract

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Figures (11)

Tables (4)

Equations (4)

Applied Optics