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A coronagraph based on two spatial light modulators for active amplitude apodizing and phase corrections
Jiangpei Dou; Deqing Ren; Xi Zhang; Yongtian Zhu; Gang Zhao; Zhen Wu
2014-08-06
会议录名称Ground-based and Airborne Instrumentation for Astronomy V
卷号9147
页码Vol.9147 8O-1-11
会议日期2014-6-22
会议地点Montréal, Quebec, Canada
会议主办者SPIE
出版者SPIE
摘要
Almost all high-contrast imaging coronagraphs proposed until now are based on passive coronagraph optical components. Recently, Ren and Zhu proposed for the first time a coronagraph that integrates a liquid crystal array (LCA) for the active pupil apodizing and a deformable mirror (DM) for the phase corrections. Here, for demonstration purpose,we present the initial test result of a coronagraphic system that is based on two liquid crystal spatial light modulators (SLM). In the system, one SLM is served as active pupil apodizing and amplitude correction to suppress the diffraction
light; another SLM is used to correct the speckle noise that is caused by the wave-front distortions. In this way, both amplitude and phase error can be actively and efficiently compensated. In the test, we use the stochastic parallel gradient descent (SPGD) algorithm to control two SLMs, which is based on the point spread function (PSF) sensing and evaluation and optimized for a maximum contrast in the discovery area. Finally, it has demonstrated a contrast of 10-6 at an inner working angular distance of ~6.2 λ/D, which is a promising technique to be used for the direct imaging of young
exoplanets on ground-based telescopes.
关键词Young Exoplanets Stellar Coronagraph Active Pupil Apodization Amplitude Correction Ground-based Telescopes
学科领域系外行星探测
文献类型会议论文
条目标识符http://ir.niaot.ac.cn/handle/114a32/788
专题会议论文
推荐引用方式
GB/T 7714
Jiangpei Dou,Deqing Ren,Xi Zhang,et al. A coronagraph based on two spatial light modulators for active amplitude apodizing and phase corrections[C]:SPIE,2014:Vol.9147 8O-1-11.
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