Abstract: Because the phase contains more information about the field compared to the amplitude, measurement of the phase is encountered in many branches of modern science and engineering. Direct measurement of the phase is difficult in the visible regime of the electromagnetic wave. One must employ computational techniques to calculate the phase from the captured intensity. In this paper, we provide a review of our recent work on iterative phase retrieval techniques and their applications in optical imaging.

Key words: Phase retrieval, Phase imaging, Computational imaging, Gerchberg-Saxton algorithm, Optical encryption, Computer-generated hologram

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