Effects of polarization aberrations in an unobscured off-axis space telescope on its PSF ellipticity

doi:10.1364/oe.412413

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	Effects of polarization aberrations in an unobscured off-axis space telescope on its PSF ellipticity
	J. Luo,X. He,K. Fan and X. H. Zhang
	2020
发表期刊	Optics Express
ISSN	1094-4087
卷号	28 期号:25 页码:37958-37970
摘要	Polarization aberrations exist in almost all astronomical telescopes. Polarization aberrations would bring about asymmetric apodization in the exit pupil, leading to asymmetric PSFs. The shape of PSFs is critical to telescopes that are used to detect weak gravitational lensing (WGL) in the universe. In this paper, polarization aberrations and their connections with PSF ellipticity in an unobscured off-axis space telescope are analyzed. Together with the Jones pupil, cumulative diattenuation and retardance maps of the telescope are obtained via polarization ray tracing. Due to asymmetric apodization caused by polarization aberrations, the ellipticities of all four PSF components are found to be greater than zero. The PSF ellipticity of the telescope over the full FOV is obtained. Results show that polarization aberrations change PSF ellipticity in different degrees at different FOVs. The maximum variance of PSF ellipticity induced by polarization aberrations is 7.5e-3 and the average value is 2.7e-3. In addition, interpolation errors of PSF ellipticity would also be affected by polarization aberrations. It is found that there arc 405 FOV points (about 4% of all FOV points involved in the calculations) whose variances of interpolation errors caused by polarization aberrations are greater than 1.4e-4. According to the results shown in this paper, polarization aberrations of telescopes play a significant role in WGL measurements. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
DOI	10.1364/oe.412413
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收录类别	SCI ; EI
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/64480
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	J. Luo,X. He,K. Fan and X. H. Zhang. Effects of polarization aberrations in an unobscured off-axis space telescope on its PSF ellipticity[J]. Optics Express,2020,28(25):37958-37970.
APA	J. Luo,X. He,K. Fan and X. H. Zhang.(2020).Effects of polarization aberrations in an unobscured off-axis space telescope on its PSF ellipticity.Optics Express,28(25),37958-37970.
MLA	J. Luo,X. He,K. Fan and X. H. Zhang."Effects of polarization aberrations in an unobscured off-axis space telescope on its PSF ellipticity".Optics Express 28.25(2020):37958-37970.

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