Theoretical analysis for best defocus measurement plane for robust phase retrieval
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Published on: February 12, 2014
Alessandro Polo1, Silvania F Pereira, Paul H Urbach
1Optics Research Group, Delft University of Technology, Delft, The Netherlands. a.polo@tudelft.nl
Optics Letters
|March 19, 2013
Abstract:
We study the phase retrieval (PR) technique using through-focus intensity measurements and explain the dependence of PR on the defocus distance. An optimal measurement plane in the out-of-focus region is identified where the intensity distribution on the optical axis drops to the first minimum after focus. Experimental results confirm the theoretical predictions and are in good agreement with an independent phase measurement.

