Phase Retrieval with Resolution Enhancement by Using Random-Phase Illumination
Phase imaging is highly desirable for industrial research and biomedical investigations, since the phase contains information about the 3D shape of the object or the inner structure for the transparent specimen. Several approaches have been proposed to obtain the phase of a wavefront. The most common is based on interferometry [1-3], where the object wave interferes with an additional reference wave, and the phase is reconstructed from the formed hologram. This approach has high accuracy for phase measurement, but the need for the additional reference wave makes it complex, and sometime inapplicable. The beam-propagation-based approaches (without reference wave) [4-8] are alternative where the diffraction patterns are recorded at different plane [4, 5], with different wavelength  or different modulations of the object wave [7, 8], and the phase is recovered by iteration between these diffraction patterns.
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