A method to realize super-resolution digital holographic imaging is demonstrated experimentally. By placing a grating in front of the specimen, more object waves can reach the charge-coupled devices target during the recording of a digital hologram, and the image reconstructed from the digital hologram has a resolution over the diffraction limit of the ordinary holographic system. This method overcomes the crucial drawback of digital holography, and may find many applications in three-dimensional digital imaging and microscopy.
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Liu et al. (2002) studied this question.
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