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Optical Engineering

Zonal representation–based residual-wavefront reconstruction using multiframe Shack-Hartmann measurements
Author(s): Shiping Guo; Rongzhi Zhang; Jisheng Li; Jianhua Zou; Rong Xu; Changhai Liu
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Paper Abstract

Atmospheric turbulence-induced wavefront deformation can be only partially corrected by adaptive optics (AO) techniques in astronomical or artificial space object imaging; an accurate estimation of the residual-wavefront phase is still needed to approach the diffraction-limited resolution. The discrete phase gradients measured by Shack-Hartmann wavefront sensors (SHWFS) can help with the estimation. In this study, we build a dynamic average slopes measurement model for SHWFS in short-exposure AO images postprocessing; the proposed model is based on a zonal representation of the wavefront phase using Bernstein basis polynomials instead of the traditional Zernike modal expansion. Further, the turbulence’s frozen flow hypothesis is adopted to update the initial model using multiframe SHWFS measurement data to achieve a more accurate reconstruction. Numerical experiments show the reconstruction errors significantly decrease even in poor seeing conditions, and show that our method is less sensitive to different SHWFS measurement noise levels.

Paper Details

Date Published: 12 November 2015
PDF: 7 pages
Opt. Eng. 54(11) 113105 doi: 10.1117/1.OE.54.11.113105
Published in: Optical Engineering Volume 54, Issue 11
Show Author Affiliations
Shiping Guo, Xi'an Jiaotong Univ. (China)
Rongzhi Zhang, Xi'an Satellite Control Ctr. (China)
Jisheng Li, Xi'an Jiaotong Univ. (China)
Jianhua Zou, Xi'an Jiaotong Univ. (China)
Rong Xu, Xi'an Satellite Control Ctr. (China)
Changhai Liu, Xi'an Satellite Control Ctr. (China)

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