Digital Holographic Superresolution by Rotating the Object Wavefield

Hennelly, Bryan M.; Naughton, Thomas J.; McDonald, John

doi:10.1364/dh.2007.dtud5

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2013

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“…Using a wavelengthtunable laser, they added together reconstructions from each of the captured DHs on an intensity basis, thus reducing the speckle content. The imple-mentation of a synthetic aperture for digital holography has been realised recently [20,21,22,23,24,25]. It is achieved by moving either the CCD or the sample, capturing multiple DHs between successive moves, and then stitching together the resulting DHs to form a larger DH.…”

Section: Introductionmentioning

confidence: 99%

Speckle reduction of reconstructions of digital holograms using three dimensional filtering

Maycock

McDonald

Hennelly

2013

Optics Communications

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We report on a new digital signal processing technique that reduces speckle in reconstructions of digital holograms. This is achieved by convolving the three dimensional intensity pattern (the intensity of the propagated DH at a series of different distances) with a 3D point spread function in all three dimensions (x,y,z ). It is based on the fact that the addition of different independent speckle images on an intensity basis reduces the speckle content. We provide quantitative results in terms of speckle index and resolution, and show that filtering in the z direction has the added benefit of an increase the depth of focus of the digital hologram reconstruction.

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