LED near-eye holographic display with a large non-paraxial hologram generation

GAEA / GAEA-2 Spatial Light Modulators
AR/VR/MR / Holographic Display
Published on:
Authors: Tomasz Kozacki, Maksymilian Chlipala, Juan Martinez-Carranza, Rafał Kukołowicz, and Moncy Sajeev Idicula
Abstract:

In this paper, two solutions are proposed to improve the quality of a large image that is reconstructed in front of the observer in a near-eye holographic display. One of the proposed techniques, to the best of our knowledge, is the first wide-angle solution that successfully uses a non-coherent LED source. It is shown that the resulting image when employing these types of sources has less speckle noise but a resolution comparable to that obtained with coherent light. These results are explained by the developed theory, which also shows that the coherence effect is angle varying. Furthermore, for the used pupil forming display architecture, it is necessary to compute a large virtual nonparaxial hologram. We demonstrate that for this hologram there exists a small support region that has a frequency range capable of encoding information generated by a single point of the object. This small support region is beneficial since it enables to propose a wide-angle rigorous CGH computational method, which allows processing very dense cloud of points that represents three-dimensional objects. This is our second proposed key development. To determine the corresponding support region, the concept of local wavefront spatial curvature is introduced, which is proportional to the tangent line to the local spatial frequency of the spherical wavefront. The proposed analytical solution shows that the size of this area strongly depends on the transverse and longitudinal coordinate of the corresponding object point.

Open Access

Publication: Optics Express
Issue/Year: Opt. Express 30, 43551-43565 (2022)
DOI: 10.1364/OE.468823
Link: https://doi.org/10.1364/OE.468823

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