Modal prediction for open-loop liquid-crystal adaptive optics systems

	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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