Simulation of speckle in pixelated hologram image recovery: application for augmented-reality retinal projection device

Fabian Rainouard; Matthias Colard; Olivier Haeberle; Christophe Martinez

doi:10.1117/12.2649933

8 March 2023 Simulation of speckle in pixelated hologram image recovery: application for augmented-reality retinal projection device

Fabian Rainouard, Matthias Colard, Olivier Haeberle, Christophe Martinez

Author Affiliations +

Proceedings Volume 12445, Practical Holography XXXVII: Displays, Materials, and Applications; 124450B (2023) https://doi.org/10.1117/12.2649933
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Our team works on a disruptive concept of Near Eye Display for Augmented Reality (AR) applications. This device requires distributions of holographic elements described as Emissive Points Distributions (EPDs) to create a composite planar wavefront emitted towards the eye. The crystalline lens focuses this signal onto the retina in a mix of diffraction and refraction processes, to form the pixels of an image. We experimentally recorded an image of the letter “R” with pixelated holograms. At the reading of this image, we observe speckle that partially alters the image. Using image processing on the experimental results, we can suppress this speckle and recover the initial “R”, which validates our concept. We develop a simulation tool based on Fourier optics to better understand the emergence of this speckle noise. With the knowledge of the recording process and the form of the hologram given by microscopy, we simulate the electric field 𝐸𝑛 reflected by the different holographic elements from a unique collimated laser. Each field 𝐸𝑛 encodes an angular pixel of the recorded image. The sum of these optical beams in field and/or in intensity allows us to analyze the role of the different optical elements in the generation of a speckle. In particular, the role of the cross interferences between different EPDs is questioned. The experimental analysis is brought for periodic EPDs but can be extended to the case of random EPDs. It gives some insights into some possible evolutions of our concept in terms of optical implementation.

Conference Presentation

Citation Download Citation

Fabian Rainouard, Matthias Colard, Olivier Haeberle, and Christophe Martinez "Simulation of speckle in pixelated hologram image recovery: application for augmented-reality retinal projection device", Proc. SPIE 12445, Practical Holography XXXVII: Displays, Materials, and Applications, 124450B (8 March 2023); https://doi.org/10.1117/12.2649933

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