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four step phase shifting hologram
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Inthe on-axis hologram, the four interferograms are captured and stored in thememory. Using this information, one can reconstruct the wave function of theobjective wave. The reconstruction may be easily performed on digitalcomputers. It can be seen from this method that four interferograms arenecessary to retrieve the original object wave. However, it is possible to usefewer interferograms in this process to record and reconstruct the originalinformation
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fresnel holography
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Process holography, whether analog or digital, and always includes a plurality of light-field generated on the hologram plane, i.e. the desired wavefront reconstruction in the generated light field. Using a digital computer to calculate the light field, there is a Fourier hologram and Fresnel hologram, according to the formula and write MATLAB simulation program.
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