An active coronagraph using a liquid crystal array for exoplanet imaging:principle and testing  被引量:1

An active coronagraph using a liquid crystal array for exoplanet imaging:principle and testing

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作  者:Xi Zhang De-Qing Ren Yong-Tian Zhu Jiang-Pei Dou 

机构地区:[1]National Astronomical Observatories/Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042,China [2]Key Laboratory of Astronomical Optics&Technology,National Astronomical Observatories/Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042,China [3]Physics&Astronomy Department,California State University Northridge,18111 Nordhoff Street,Northridge,California 91330-8268,USA [4]Graduate University of Chinese Academy of Sciences,Beijing 100049,China

出  处:《Research in Astronomy and Astrophysics》2012年第5期591-600,共10页天文和天体物理学研究(英文版)

基  金:supported by the "Strategic Priority Research Program" of the Chinese Academy of Sciences(Grant No.XDA04070600);the National Natural Science Foundation of China(Grant Nos.11003031 and 10873024);as well as the National Astronomical Observatories' Special Fund for Astronomy-2009;Part of the work described in this paper was carried out at California State University Northridge,with support from the National Science Foundation under Grant ATM-0841440

摘  要:High-contrast imaging coronagraphs, used for the detection of exoplanets, have always adopted passive coronagraph optical components. It is therefore impossible to actively optimize the coronagraphs to achieve their best performance. To solve this problem, we propose a novel high-contrast imaging coronagraph which combines a liquid crystal array (LCA) for active pupil apodization and a deformable mirror (DM) for phase correction. The LCA we use is an amplitude-only spatial light mod- ulator. The LCA is well calibrated and compensates for its amplitude non-uniformity and nonlinear intensity responsivity. We measured the imaging contrasts of the coron- agraph system with the LCA only and without the DM deployed. Imaging contrasts of 10-4 and 10-5 can be reached at an inner working angular distance of 2.5 and 5A/D, respectively. A simulation shows that the phase errors on the coronagraph pupil limit the contrast performance. The contrast could be further improved if a DM is deployed to correct the phase errors induced by the LCA and coronagraph optics.High-contrast imaging coronagraphs, used for the detection of exoplanets, have always adopted passive coronagraph optical components. It is therefore impossible to actively optimize the coronagraphs to achieve their best performance. To solve this problem, we propose a novel high-contrast imaging coronagraph which combines a liquid crystal array (LCA) for active pupil apodization and a deformable mirror (DM) for phase correction. The LCA we use is an amplitude-only spatial light mod- ulator. The LCA is well calibrated and compensates for its amplitude non-uniformity and nonlinear intensity responsivity. We measured the imaging contrasts of the coron- agraph system with the LCA only and without the DM deployed. Imaging contrasts of 10-4 and 10-5 can be reached at an inner working angular distance of 2.5 and 5A/D, respectively. A simulation shows that the phase errors on the coronagraph pupil limit the contrast performance. The contrast could be further improved if a DM is deployed to correct the phase errors induced by the LCA and coronagraph optics.

关 键 词:instrumentation: coronagraph liquid crystal array - techniques high-contrast imaging exoplanet detection 

分 类 号:P185[天文地球—天文学] P182.62

 

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