A coronagraph based on two spatial light modulators for active amplitude apodizing and phase corrections | |
Jiangpei Dou![]() ![]() ![]() ![]() ![]() ![]() | |
2014-08-06 | |
Source Publication | Ground-based and Airborne Instrumentation for Astronomy V |
Volume | 9147 |
Pages | Vol.9147 8O-1-11 |
Conference Date | 2014-6-22 |
Conference Place | Montréal, Quebec, Canada |
Funding Organization | SPIE |
Publisher | SPIE |
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. |
Keyword | Young 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 |
Identifier | http://ir.niaot.ac.cn/handle/114a32/788 |
Collection | 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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