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Opt Lett. 2009 Dec 1;34(23):3610-2. doi: 10.1364/OL.34.003610.

Twin removal in digital holography using diffuse illumination.

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Department of Computer Science, National University of Ireland, Maynooth, County Kildare, Ireland.


A method to numerically remove the twin image for inline digital holography, using multiple digital holograms, is discussed. Each individual hologram is recorded by using a statistically independent speckle field to illuminate the object. If the holograms are recorded in this manner and then numerically reconstructed, the twin image appears as a different speckle pattern in each of the reconstructions. By performing speckle-reduction techniques the presence of the twin image can be greatly reduced. A theoretical model is developed, and experimental results are presented that validate this approach. We show experimentally that the dc object intensity term can also be removed by using this technique.

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