Digital holography is a technique replacing the conventional holographic recording media by digital sensors. It utilizes numerical methods to reconstruct the wave front of an object. Digital holography not only takes the advantage of the optical characteristic of parallel processing but also combining this advantage with electronic devices. This study devotes to minimize the size of digital holographic microscope. It is realized by using a volume holographic optical element to replace the conventional beam splitter. Multi calculation methods including spherical wave illumination, spherical wave reference and interpolation technique are proposed to achieve high resolution when the objects is very close to the image detector. The ideas have been demonstrated by both simulation and experiment.
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