NIAOT OpenIR  > 中国科学院南京天文光学技术研究所  > 期刊论文
Stochastic parallel gradient descent based adaptive optics used for a high contrast imaging coronagraph
Bing Dong; De-Qing Ren; Xi Zhang
2011-08
Source PublicationResearch in Astronomy and Astrophysics
Volume11Issue:8Pages:997–1002
Abstract
An adaptive optics (AO) system based on a stochastic parallel gradient descent (SPGD) algorithm is proposed to reduce the speckle noises in the optical system of a stellar coronagraph in order to further improve the contrast. The principle of the SPGD algorithm is described briefly and a metric suitable for point source imaging optimization is given. The feasibility and good performance of the SPGD algorithm is demonstrated by an experimental system featured with a 140-actuator deformable mirror and a Hartmann-Shark wavefront sensor. Then the SPGD based AO is applied to a liquid crystal array (LCA) based coronagraph to improve the contrast. The LCA can modulate the incoming light to generate a pupil apodization mask of any pattern. A circular stepped pattern is used in our preliminary experiment and the image contrast shows improvement from 10-3 to 10-4.5at an angular distance of 2λ/D after being corrected by SPGD based AO.
KeywordAdaptive Optics Laboratory Image Processing Coronagraph
Subject Area系外行星探测
WOS IDWOS:000294232800011
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.niaot.ac.cn/handle/114a32/623
Collection中国科学院南京天文光学技术研究所_期刊论文
天文光谱和高分辨成像技术研究室_期刊论文
Recommended Citation
GB/T 7714
Bing Dong,De-Qing Ren,Xi Zhang. Stochastic parallel gradient descent based adaptive optics used for a high contrast imaging coronagraph[J]. Research in Astronomy and Astrophysics,2011,11(8):997–1002.
APA Bing Dong,De-Qing Ren,&Xi Zhang.(2011).Stochastic parallel gradient descent based adaptive optics used for a high contrast imaging coronagraph.Research in Astronomy and Astrophysics,11(8),997–1002.
MLA Bing Dong,et al."Stochastic parallel gradient descent based adaptive optics used for a high contrast imaging coronagraph".Research in Astronomy and Astrophysics 11.8(2011):997–1002.
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