Abstract
Computer-generated holography can obtain the wavefront required for constructing arbitrary intensity distributions in space. Currently, speckle noises in holography remain an issue for most computational methods. In addition, there lacks a multiplexing technology by which images from a single hologram and light source can be switched by a lens. In this work, we first come up with a new algorithm to generate holograms to project smoother images by wavevector filtering. Thereupon, we propose a unique multiplexing scheme enabled by a Fourier lens, as the incident light can be decomposed either by a superposition of spherical waves or plane waves. Different images are obtained experimentally in the spatial and wavevector domains, switchable by a lens. The embedded wavevector filtering algorithm provides a new prospective for speckle suppression without the need for postprocessing. The multiplexing technology can double the capacity of current holographic systems and exhibits potential for various interesting display applications.
Highlights
The holographic display technology can generate arbitrary wavefront of light with simple hardware configurations [1, 2]
We have proposed the Fourier lens as a new optical component to switch projected images from a single computer-generated hologram (CGH)
The method can work with other holographic multiplexing methods, and is applicable to various types of holographic media
Summary
The holographic display technology can generate arbitrary wavefront of light with simple hardware configurations [1, 2]. Our work indicates the new opportunities for high quality image projections from CGH generated by the modified GS algorithm Using this new algorithm, we have demonstrated the multiplexing of two complex target images with a simple lens experimentally. Concept of the holographic multiplexing method It is widely known that light can be treated as a superposition of spherical waves emitting from different positions or plane waves with different propagating angles (wavevector directions), as shown in Fig. 1a and b, respectively. The viewer at a fixed position can choose which contents to see from the screen by wearing lens or not, while viewers at other locations can get neither of these contents In another scenario, the CGH can project images to different viewers [18, 21], Fig. 1 a and b The interpretation of light as a superposition of spherical waves and plane waves. The relationship between the resulted image I′ and the target image I is derived as (see Supplementary Information for details): I′
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