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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
Source PublicationOptical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
PagesVol.8197 0M-1-10
Conference Date2011-11-6
Conference PlaceBeijing, China
Funding OrganizationThe International Society for Optical Engineering
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
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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