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Testing of a high-contrast imaging coronagraph based on an active liquid crystal array
Xi Zhang; Deqing Ren; Yongtian Zhu; Jiangpei Dou; Xue Wang
2011-12-05
Source PublicationOptical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
Volume8197
Issue8197
PagesVol.8197 0M-1-10
Conference Date2011-11-6
Conference PlaceBeijing, China
Funding OrganizationThe International Society for Optical Engineering
PublisherSPIE
Abstract
Liquid crystal modulator is an active optical component that is promising to replace traditional passive optical components. For high-contrast imaging coronagraphs that are used for direct imaging of extra-solar planets, passive coronagraph optical components are often adopted. It is impossible to actively optimize such a coronagraph system to achieve its best performance. Thus we’ve proposed a novel high-contrast imaging coronagraph which uses a liquid crystal array (LCA) for pupil apodizing. In our test, the LCA is well calibrated for amplitude errors and amplitude nonuniformity with the entire coronagraph optics. Close-loop compensations are applied according to the amplitude
calibration results. By doing so, a contrast of 10-4or 10-5can be achieved in an angular distance down to 3~5λ/D, which can be used for the direct imaging for young and Jupiter-like planets. The contrast can be further improved if a deformable mirror (DM) is deployed to correct wave-front errors induced by the LCA and the coronagraph optics.
KeywordExoplanets Detection High-contrast Imaging Liquid Crystal Array Amplitude Correction Non-uniformity Compensation
Subject Area系外行星探测
Document Type会议论文
Identifierhttp://ir.niaot.ac.cn/handle/114a32/626
Collection中国科学院南京天文光学技术研究所_会议论文
天文光谱和高分辨成像技术研究室_会议论文
Recommended Citation
GB/T 7714
Xi Zhang,Deqing Ren,Yongtian Zhu,et al. Testing of a high-contrast imaging coronagraph based on an active liquid crystal array[C]:SPIE,2011:Vol.8197 0M-1-10.
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