17 November 2000 Effect of aperture subdivision on wavefront sensing
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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.
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Marcos A. van Dam, Marcos A. van Dam, Richard G. Lane, Richard G. Lane, } "Effect of aperture subdivision on wavefront sensing", Proc. SPIE 4125, Propagation and Imaging through the Atmosphere IV, (17 November 2000); doi: 10.1117/12.409305; https://doi.org/10.1117/12.409305
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