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Moment-based wavefront reconstruction via a defocused Shack–Hartmann sensor
Fan Feng1,2,3; Changwei Li1,2; Sijiong Zhang1,2
2018-07
Source PublicationOptical Engineering
Volume57Issue:7Pages:074106(1-10)
Other Abstract
An approach for wavefront reconstruction based on a defocused Shark–Hartmann sensor is proposed.In this approach, not only the first-order origin moment (local slope of the input wavefront) but also the second-order central moment (local curvature of the input wavefront) of each spot in the intensity pattern is used to reconstruct the input wavefront.

By introducing the second-order moment, an improvement of reconstruction accuracy can be obtained. As the ambiguity of the sense of the local curvature of the input wavefront exists in the scheme of the conventional Shack–Hartmann sensor in focus, a defocusing scheme is adopted to solve this problem. Based on modal and zonal methods, respectively, the corresponding algorithms are invoked to reconstruct the wavefront from the map consisted of both local slopes and curvatures.

Numerical experiments show that the reconstructed wavefront by the proposed method is more accurate, in comparison to the result by the conventional method. It should be mentioned that the defocused sensor used in the proposed method sacrifices, to some extent, the dynamic range of measurement.
KeywordWavefront Reconstruction Second-order Moment Numerical Approximation And Analysis Active Or Adaptive Optics
Subject Area天文技术与方法
Language英语
Document Type期刊论文
Identifierhttp://ir.niaot.ac.cn/handle/114a32/1551
Collection中国科学院南京天文光学技术研究所_期刊论文
中科院天文光学技术重点实验室_期刊论文
Affiliation1.南京天文光学技术研究所
2.天文光学技术重点实验室
3.中国科学院大学
Recommended Citation
GB/T 7714
Fan Feng,Changwei Li,Sijiong Zhang. Moment-based wavefront reconstruction via a defocused Shack–Hartmann sensor[J]. Optical Engineering,2018,57(7):074106(1-10).
APA Fan Feng,Changwei Li,&Sijiong Zhang.(2018).Moment-based wavefront reconstruction via a defocused Shack–Hartmann sensor.Optical Engineering,57(7),074106(1-10).
MLA Fan Feng,et al."Moment-based wavefront reconstruction via a defocused Shack–Hartmann sensor".Optical Engineering 57.7(2018):074106(1-10).
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