In this paper, we present theoretic modelling of color breaking in a holographic-optical-element based Augmented Reality (AR) display. We first build up a theoretic optical model of the AR display system using scalar diffraction method. The discussions about the design parameters of holographic optical elements (HOE) for Augmented Reality (AR) glasses, focusing on color uniformity as a function of the waveguide thickness are conducted. It can be used to evaluate the color breaking of a displayed white image from user’s point of view. The simulation results show that color breaking occurs due to the limitations of pupil size and image shifting caused by the extended eye-box. Moreover, the thickness of the waveguide also causes uneven color distribution. Our model can also provide a way to analyze the relationship between waveguide thickness and color uniformity. In addition, based on those results, we propose a color correction algorithm by applying a pre-compensation scheme to the R/G/B values of each display pixel. Results show light display colors can be better corrected in the wider region of user’s field of view. It demonstrates the feasibility of compensation of color breaking in a holographic-optical-element based AR display.
In this paper, we present a space division technique to multiplex communication channels in a regular step-index multimode fiber using holographic correlator. We consider a multimode fiber with a large diameter of core as highly scattering medium. Thus, the focusing laser spot at different position on the incident plane of the fiber excites different sets of modes, which gives a different speckle pattern at the output of the fiber. Hence, each focusing spot can be considered as a communication channel for data transmission. By combining the volume holographic techniques to form channel multi/demultiplexer in a transmission system, we demonstrate conceptually transmission of multichannel optical information by using a regular step-index multimode fiber for data transmission application.
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