This Conference Presentation, Holographic photopolymers using thiol-ene chemistry was recorded at SPIE Photonics West 2022 held in San Francisco, California, United States.

Traditional head-up-displays (HUDs) suffer from a lack of compactness mainly due to the use of bulky optics (i.e., folding mirrors, beam combining optics). The implementation of holographic optical elements (HOEs) in the development of HUDs leads to lighter and more compact units. The aim of this presentation is to demonstrate the use of hologram recording in photo-thermo-refractive (PTR) glass technology for fabricating a diffractive 2D beam splitter for head-up display eye-box. We explored two directions – a combination of transmitting volume Bragg gratings and holographic phase masks encrypted in such Bragg gratings.

We report diffractive network-based all-optical reconstruction of inline holograms, eliminating twin-image artifacts without the use of a digital computer. We show that these trained diffractive networks generalize very well to reconstruct unknown holograms of new, unseen objects at the speed of light propagation through the physical diffractive network. The diffractive hologram reconstruction networks also exhibit improved diffraction efficiency and extended depth-of-field. All-optical reconstruction of holograms using passive diffractive networks can find numerous applications in holographic imaging and display-related applications due to its computer-free hologram reconstruction capability that is completed at the speed of light propagation within spatially engineered diffractive materials.

This Conference Presentation, Design of wide-viewing angle, full-color, high-definition, computer-generated holograms with off-axis illumination was recorded at SPIE Photonics West 2022 held in San Francisco, California, United States.