Speckle reduced lensless holographic projection from phase-only computer-generated hologram
PLUTO / PLUTO-2Spatial Light Modulators
AR/VR/MR / Holographic Display
Published on:
Authors: Chenliang Chang and Yijun Qi and Jun Wu and Jun Xia and Shouping Nie
Abstract: “This paper presents a method for the implementation of speckle reduced lensless holographic projection based on phase-only computer-generated hologram (CGH). The CGH is calculated from the image by double-step Fresnel diffraction. A virtual convergence light is imposed to the image to ensure the focusing of its wavefront to the virtual plane, which is established between the image and the hologram plane. The speckle noise is reduced due to the reconstruction of the complex amplitude of the image via a lensless optical filtering system. Both simulation and optical experiments are carried out to confirm the feasibility of the proposed method. Furthermore, the size of the projected image can reach to the maximum diffraction bandwidth of the spatial light modulator (SLM) at a given distance. The method is effective for improving the image quality as well as the image size at the same time in compact lensless holographic projection system.”
Dual-task convolutional neural network based on the combination of the U-Net and a diffraction propagation model for phase hologram design with suppressed speckle noise
Authors:Joanna Starobrat, Szymon Fiderkiewicz, Andrzej Kołodziejczyk, Maciej Sypek, Romuald Beck, Krystian Pavłov, Mateusz Słowikowski, Adam Kowalczyk, Jarosław Suszek, Michał Makowski
Suppression of spurious image duplicates in Fourier holograms by pixel apodization of a spatial light modulator
