Simultaneous Color Holographic Display

Introduction

A holographic display is a type of display system that produces 3D or 2D images by manipulating the wavefront of light. With the help of a spatial light modulator (SLM), a holographic display can manipulate the phase of a coherent wavefront at the pixel level. This allows it to reshape the wavefront precisely as it would originally emanate from a real object, creating an image with genuine depth cues.

Holographic displays typically use a laser as a light source, resulting in monochromatic holograms. To achieve color holograms, color holographic displays sequentially switch between RGB lasers at a high rate, leveraging the persistence of vision property of the human eye. This allows the human eye to fuse sequential monochromatic holograms into a perceived color hologram. However, this color scheme sacrifices the refresh rate of the SLM, as displaying one frame of a color target requires displaying three phase patterns, one for each RGB channel.

One potential solution to fully utilize the SLM’s refresh rate is to simultaneously activate the three primary laser lights and have the SLM modulate these three wavefronts with different wavelengths at the same time, using the same phase pattern. This approach could potentially allow for full utilization of the SLM’s refresh rate.

This project aims to investigate the effectiveness of traditional phase retrieval pipelines in this setup and explore potential improvements in reconstruction quality through the use of different loss functions.