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Proceedings Paper

Effect of aperture subdivision on wavefront sensing
Author(s): Marcos A. van Dam; Richard G. Lane
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Paper Abstract

Phase retrieval is a non-linear technique to recover the phase in the Fourier domain using intensity measurements at the image plane and additional constraints. We describe a method to solve the phase retrieval problem using linear iterations near the solution, a technique that gives both physical insight into phase retrieval and numerical results. When phase retrieval is done on data from subdivided apertures, there is a loss of information about the relative piston terms of the subapertures and this error has been quantified. We find that there is a smaller wavefront error when estimating the phase form a full aperture than from a subdivided aperture. However, using a combination of intensity measurements from a full and a subdivided aperture gives a much better performance. The error in estimating the wavefront also increases with increasing turbulence levels.

Paper Details

Date Published: 17 November 2000
PDF: 12 pages
Proc. SPIE 4125, Propagation and Imaging through the Atmosphere IV, (17 November 2000); doi: 10.1117/12.409305
Show Author Affiliations
Marcos A. van Dam, Univ. of Canterbury (United States)
Richard G. Lane, Univ. of Canterbury (New Zealand)

Published in SPIE Proceedings Vol. 4125:
Propagation and Imaging through the Atmosphere IV
Michael C. Roggemann, Editor(s)

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