| Stochastic parallel gradient descent based adaptive optics used for a high contrast imaging coronagraph | |
Bing Dong; De-Qing Ren ; Xi Zhang
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| 2011-08 | |
| Source Publication | Research in Astronomy and Astrophysics
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| Volume | 11Issue: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. |
| Keyword | Adaptive Optics Laboratory Image Processing Coronagraph |
| Subject Area | 系外行星探测 |
| WOS ID | WOS:000294232800011 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.niaot.ac.cn/handle/114a32/623 |
| Collection | 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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