Abstract
We propose a single-frame zero-order-eliminated reconstruction method by fractional Fourier transform filtering for an off-axis digital hologram. The filtering in the fractional Fourier transform domain of the hologram can effectively improve the reconstruction resolution, but it is required to remove its zero-order term. With the zero-order-term elimination of the Laplacian hologram, the higher reconstruction resolution of a single-frame hologram is achieved by zero-padding the hologram and choosing the optimal option of the fractional-order number. The results demonstrate that the resolutions of reconstructed amplitude and phase images are obviously improved. It will have a promising application in real-time imaging for biological cells and moving objects.
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