Abstract
Coherent backlight is an essential component for holographic displays. In this paper, a compact design of edge-lit coherent backlight featuring two holographic optical elements for two-dimensional beam expansion is presented. Its diffraction efficiency is numerically studied using the coupled-wave theory. In experiments, the diffraction efficiency is measured as 4.3% and the feasibility of this design is verified by reconstructing 3D images with a spatial light modulator.
Highlights
Holography is considered as an ultimate three-dimensional (3D) technique because it can exactly reconstruct the wavefront and render a 3D scene naturally [1,2,3]
The simulated hologram is recorded by a plane wave and a scattered wave which can be regarded as the superposition of multiple linear gratings
The expanded wave is projected onto a spatial light modulator (SLM) (PLUTO, Holoeye) to display holographic 3D images
Summary
Holography is considered as an ultimate three-dimensional (3D) technique because it can exactly reconstruct the wavefront and render a 3D scene naturally [1,2,3]. Some efforts have been made on compact expanders for lasers using optical folding method or edge-illuminated holograms [5,6,7,8,9], they can only expand the beam in one dimension. In another compact beam expander introduced by Revital et al [10], the output are discrete multiple light spots which cannot be used as an entire plane wave. Xiong et al [11] proposed a two-dimensional coherent backlight design using a scattered wave to read out a reflection hologram. 3D holographic images are reconstructed using this coherent light
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