Phase Retrieval Microscope for Quantitative Imaging of a Weak Phase Object

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Abstract
Optical phase retrieval using the iterative Fourier transform algorithm has long been believed inadequate for the quantitative imaging of weak phase objects, but in this letter it is shown to be greatly improved by introducing the preprocess of Fourier intensity data as well as by adopting a cooled charge coupled device (C-CCD) camera to record the data. The preprocess consists of the addition of multiple data, the sensitivity correction of the C-CCD camera, and the modification of the Fourier intensity data with a Wiener optimal filter. The phase distribution of a very weak phase object ( maximum path difference of λ/32 ) is experimentally retrieved fairly well.

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