Holographic optical elements (HOEs) are very interesting optical devices based on the holography technique and have been spotlighted in the augmented reality (AR) application recently. The HOEs have optically see-through property due to their high angular-selectivity, which has an extensive potential to be employed as an image combiner for the AR devices. Various optical functions, such as reflection, lens and diffusing, can be implemented with thin-layer HOEs. This advantage can replace the conventional bulky optics with HOEs for a compact form factor. In addition, multi-functionality can be realized with multiplexed recording, and optical mass production is possible, which is especially useful for AR display systems.
Byoungho Lee, Chanhyung Yoo, and Jinsoo Jeong, "Holographic optical elements for augmented reality systems," Proc. SPIE 11551, Holography, Diffractive Optics, and Applications X, 1155103 (Presented at SPIE/COS Photonics Asia: October 12, 2020; Published: 10 October 2020); https://doi.org/10.1117/12.2573605.
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