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Eliminating Granularity from Hologram Reconstruction

IP.com Disclosure Number: IPCOM000090757D
Original Publication Date: 1969-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Pennington, KS: AUTHOR

Abstract

This technique employs known methods for forming holograms plus a unique step for eliminating granularity. Two holograms of a subject are superimposed with the conditions that different reference beams are used for each hologram and that the subject has a different phase distribution and identical intensity of illumination in each hologram. The holograms are then reconstructed simultaneously by their relevant reference beams resulting in two superimposed reconstructions of the subject with the exception that the phase distribution differs leading to an interference pattern across the resulting record. The relative phase of the two reconstructing reference beams is then varied resulting in a variation in the relative phase of the reconstructed subjects.

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Eliminating Granularity from Hologram Reconstruction

This technique employs known methods for forming holograms plus a unique step for eliminating granularity. Two holograms of a subject are superimposed with the conditions that different reference beams are used for each hologram and that the subject has a different phase distribution and identical intensity of illumination in each hologram. The holograms are then reconstructed simultaneously by their relevant reference beams resulting in two superimposed reconstructions of the subject with the exception that the phase distribution differs leading to an interference pattern across the resulting record. The relative phase of the two reconstructing reference beams is then varied resulting in a variation in the relative phase of the reconstructed subjects. The interference pattern moves and thus results in a time average record which exhibits no granularity and no loss in resolution. Granularity is due to interference and the large spatial coherence and aperture limitations. In this technique, the interference is used to time average out the granularity effect. The technique is applicable to all holograms. It is suited to volume holograms and is of importance for projection imaging of high resolution targets.

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