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9 March 2022 Diffraction properties of cylindrical volume holographic optical element for AR display
Daisuke Barada
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Proceedings Volume PC12025, Ultra-High-Definition Imaging Systems V; PC1202502 (2022) https://doi.org/10.1117/12.2614706
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
In see-through head-mount displays such as AR display, lightweight characteristics are required for long-term use. In addition, large field of view and large eye-box are important as characteristics of head-mount displays. However, it is difficult to realize these characteristics simultaneously. To realize the characteristics, it is proposed that a cylindrical volume holographic optical element (CVHOE) is used as a waveguide for AR displays. In CVHOE, a cylindrical wave is diffracted as a plane wave. By using the CVHOE, multiple cylindrical waves can be transformed into multiple plane waves with different wave vectors. When pixels of a image is regarded as point sources, the point sources can be transformed into cylindrical waves. Therefore, point sources that consist of an image can be transformed into plane waves by using a cylindrical lens and CVHOE. By looking the CVHOE, the original point sources are imaged on a retina. Then, large eye-box can be achieved because of plane waves. Furthermore, large field of view can be enlarged by adjusting the diffraction angle of CVHOE. In this system, there is a characteristic that a CVHOE for a full-color display can be prepared by using a monochromatic light source. However, many times exposure are required in high-definition display. In this study, numerical simulation was performed to decrease the number of exposures. The method is based on perturbation theory in Maxwell’s equations. The diffraction properties of CVHOE were evaluated by the numerical simulation.
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Daisuke Barada "Diffraction properties of cylindrical volume holographic optical element for AR display", Proc. SPIE PC12025, Ultra-High-Definition Imaging Systems V, PC1202502 (9 March 2022); https://doi.org/10.1117/12.2614706
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KEYWORDS
Diffraction
Holographic optical elements
Numerical simulations
Light sources
Maxwell's equations
Retina
Waveguides
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