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 | |
会议日期 | 2014-6-22 |
会议地点 | Montréal, Quebec, Canada |
关键词 | young exoplanets stellar coronagraph active pupil apodization amplitude correction ground-based telescopes |
卷号 | 9147 |
页码 | Vol.9147 8O-1-11 |
英文摘要 |
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. |
会议主办者 | SPIE |
会议录 | Ground-based and Airborne Instrumentation for Astronomy V |
会议录出版者 | SPIE |
学科主题 | 系外行星探测 |
内容类型 | 会议论文 |
源URL | [http://ir.niaot.ac.cn/handle/114a32/788] |
专题 | 南京天文光学技术研究所_中科院南京天光所知识成果_会议论文 南京天文光学技术研究所_天文光谱和高分辨成像技术研究室_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]. 见:. Montréal, Quebec, Canada. 2014-6-22. |
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