Open AccessAstigmatism correction and quality optimization of computer-generated holograms for holographic waveguide displays
Author(s) -
Wen Wei Lin,
Osamu Matoba,
Bertrand M.T. Lin,
Wei-Chia Su
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.381193
Subject(s) - optics , holography , astigmatism , waveguide , speckle pattern , diffraction , fresnel diffraction , image quality , coherence (philosophical gambling strategy) , speckle noise , diffraction efficiency , holographic display , fresnel number , physics , computer science , image (mathematics) , quantum mechanics , artificial intelligence
In this manuscript, the astigmatism of the waveguide combiner with a pair of symmetry HOEs was analyzed. The light field can be predicted by the modified convolution formulation of Fresnel diffraction when the information of light passes through the astigmatism causing element. Then the astigmatism can be corrected. The theory was experimentally proved by the system with a phase-only SLM and a diffraction planar waveguide. Furthermore, the image quality of astigmatism corrected phase-type CGHs can be improved via the iteration process. Since the coherence of light source was employed, the temporal averaging method was utilized to avoid speckle noise.