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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
Source PublicationGround-based and Airborne Instrumentation for Astronomy V
Volume9147
PagesVol.9147 8O-1-11
Conference Date2014-6-22
Conference PlaceMontréal, Quebec, Canada
Funding OrganizationSPIE
PublisherSPIE
Abstract
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.
KeywordYoung Exoplanets Stellar Coronagraph Active Pupil Apodization Amplitude Correction Ground-based Telescopes
Subject Area系外行星探测
Document Type会议论文
Identifierhttp://ir.niaot.ac.cn/handle/114a32/788
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
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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