Enlarging Holograms Under White Light, a Way to Save Holographic Material

TL;DR

This paper presents techniques for enlarging holograms under white light using holographic screens, enabling the projection of enlarged images with potential material savings and improved viewing methods.

Contribution

The authors introduce a novel method for employing holographic screens under white light to enlarge holograms, demonstrating a practical approach to hologram projection and viewing.

Findings

Successful enlargement of holograms under white light

Encoding views with sequential wavelength variation

Angular redistribution enables view decoding

Abstract

We developed techniques for employing holographic screens under white light, first exhibited to the public in 1989 (3) (4) which demonstrated the possibility of enlarging holograms already in 1990 (5). Fig. 1 shows how we encode views in a first step. The plane of the figure is horizontal, and a thin vertical slit is necessary to project each different view of the scene at a different sequential wavelength value. Decoding happens because the projected views are naturally angularly redistributed by the holographic screen (6).