Changchun Institute of Optics,Fine Mechanics and Physics,CAS
Modal prediction for open-loop liquid-crystal adaptive optics systems | |
Liu C.; Hu L. F.; Mu Q. Q.; Cao Z. L.; Hu H. B.; Zhang X. Y.; Lu Y. J.; Xuan L. | |
2012 | |
发表期刊 | Acta Physica Sinica |
ISSN | 1000-3290 |
卷号 | 61期号:12 |
摘要 | In order to reduce the time delay of the liquid-crystal (LC) adaptive optics system (AOS) which reduces the image resolution of the observed objects, we present a new technique for the first time which is called recursive least square (RLS) modal prediction of turbulent wavefront. First, we introduce the structure of the open-loop LC AOS with RLS predictor. Second, we present the RLS modal prediction algorithm in detail. Third, an actual open-loop LC AOS is designed and built, and the RLS prediction is carried out on it. It is shown that under a pure time delay system and the turbulent condition with Greenwood frequency of 35 Hz and Fried parameter of 6 cm, after prediction the residual wavefront error reducs to 0.15 wave (wave = 785 nm) from 0.26 wave that is obtained through the direct open loop correction. The prediction gain reaches 42%. Finally, the images obtained by the open-loop AOS with and without prediction are demonstrated. With direct correction without prediction, the image resolution reache 25.4 cycles/mm. After the correction with RLS prediction, the image resolution reaches 32.0 cycles/mm which is equal to 0.9 of the diffraction limit resolution of the system. Therefore, with respect to correction without prediction, a relative gain of 26% in image resolution is achieved with RLS prediction. In conclusion, the RLS modal prediction can improve the image resolution of the open-loop LC AOS effectively. |
收录类别 | SCI |
语种 | 中文 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.ciomp.ac.cn/handle/181722/34063 |
专题 | 中科院长春光机所知识产出 |
推荐引用方式 GB/T 7714 | Liu C.,Hu L. F.,Mu Q. Q.,et al. Modal prediction for open-loop liquid-crystal adaptive optics systems[J]. Acta Physica Sinica,2012,61(12). |
APA | Liu C..,Hu L. F..,Mu Q. Q..,Cao Z. L..,Hu H. B..,...&Xuan L..(2012).Modal prediction for open-loop liquid-crystal adaptive optics systems.Acta Physica Sinica,61(12). |
MLA | Liu C.,et al."Modal prediction for open-loop liquid-crystal adaptive optics systems".Acta Physica Sinica 61.12(2012). |
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