A sequential optimization procedure designed for Lyot coronagraph aiming to realize high contrast direct imaging for exoplanets

doi:10.1117/12.2561263

CORC > 西安光学精密机械研究所 > 中国科学院西安光学精密机械研究所 > 空间光学应用研究室

	A sequential optimization procedure designed for Lyot coronagraph aiming to realize high contrast direct imaging for exoplanets
	Ge, Rui; Wang, Pengfei; Wang, Yuanbo; Zhao, Hui; Wei, Jingxuan; Duan, Yongqiang; Fan, Xuewu
	2021
会议日期	2020-12-14
会议地点	ELECTR NETWORK
关键词	exoplanet imaging Lyot coronagraph high contrast imaging sequential optimization
卷号	11443
DOI	10.1117/12.2561263
英文摘要	Coronagraph is a powerful instrumentation that can be used to realize direct exoplanet imaging. Because the stars are far brighter than the exoplanets, a very high requirement for extinction is raised to obtain a high contrast imaging. By optimizing the transmittance of the entrance pupil and the Lyot stop in Lyot Coronagraph, a sequential optimization procedure is proposed to obtain even higher contrast imaging. In this manuscript, the usually adopted joint optimization in the existing literatures is divided into two steps, which we call the sequential optimization procedure. First, the entrance pupil is optimized for maximum transmission while the contrast constraint is imposed on the focal plane of the lens behind it. Second, the Lyot stop is optimized for maximum transmission with the contrast constraint imposed on the imaging plane. Compared with the joint optimization procedure, the sequential one can provide additional advantages. In terms of performance, under the same conditions, an IWA(Inner working angle) of 1.53 lambda/D can be obtained while the IWA for joint one is 2.01 lambda/D. Moreover, the sequential optimization is much faster. Referring to practical applications, the optimum transmittance of Lyot stop in sequential case becomes binary and therefore easy to fabricate. However sequential optimization reduces the throughput approximately 36.81%, which is a drawback that should be compensated.
产权排序	1
会议录	SPACE TELESCOPES AND INSTRUMENTATION 2020: OPTICAL, INFRARED, AND MILLIMETER WAVE
会议录出版者	SPIE-INT SOC OPTICAL ENGINEERING
语种	英语
ISSN号	0277-786X;1996-756X
ISBN号	978-1-5106-3674-3
WOS记录号	WOS:000646193100054
内容类型	会议论文
源URL	[http://ir.opt.ac.cn/handle/181661/94826]
专题	西安光学精密机械研究所_空间光学应用研究室
推荐引用方式 GB/T 7714	Ge, Rui,Wang, Pengfei,Wang, Yuanbo,et al. A sequential optimization procedure designed for Lyot coronagraph aiming to realize high contrast direct imaging for exoplanets[C]. 见:. ELECTR NETWORK. 2020-12-14.