Interferenceless coded aperture correlation holography–a new technique for recording incoherent digital holograms without two-wave interference

PLUTO / PLUTO-2 Spatial Light Modulators
Digital-/ Computer Holography/ CGH
Published on:
Authors: A. Vijayakumar and Joseph Rosen
Abstract:

“Recording digital holograms without wave interference simplifies the optical systems, increases their power efficiency and avoids complicated aligning procedures. We propose and demonstrate a new technique of digital hologram acquisition without two-wave interference. Incoherent light emitted from an object propagates through a random-like coded phase mask and recorded directly without interference by a digital camera. In the training stage of the system, a point spread hologram (PSH) is first recorded by modulating the light diffracted from a point object by the coded phase masks. At least two different masks should be used to record two different intensity distributions at all possible axial locations. The various recorded patterns at every axial location are superposed in the computer to obtain a complex valued PSH library cataloged to its axial location. Following the training stage, an object is placed within the axial boundaries of the PSH library and the light diffracted from the object is once again modulated by the same phase masks. The intensity patterns are recorded and superposed exactly as the PSH to yield a complex hologram of the object. The object information at any particular plane is reconstructed by a cross-correlation between the complex valued hologram and the appropriate element of the PSH library. The characteristics and the performance of the proposed system were compared with an equivalent regular imaging system.”

Open Access

Publication: Optics Express
Issue/Year: Optics Express Vol. 25, Issue 12, pp. 13883-13896 (2017)
DOI: 10.1364/OE.25.013883
Link: https://doi.org/10.1364/OE.25.013883

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