Abstract
In this study, we demonstrate enhancement of the spatial resolution in digital holographic microscopy (DHM) using the spatial correlation properties of speckle patterns. In this method, the spatial correlation coefficients of speckle intensity are controlled by illuminating a diffuser, such as a ground glass plate, with an illumination spot with intensity profiles of a ring shape produced by an amplitude-modulated aperture. These speckle patterns are incident on an object to achieve a higher numerical aperture of the illumination system in DHM. The theoretical predictions and experimental results show that higher spatial resolution in DHM can be realized by adjusting the spatial correlation properties of speckle patterns.
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