Hologram fabrication process, and hologram fabricated by that process

Abstract

The invention provides a hologram fabrication process, characterized by comprising steps of fabricating a computer-generated hologram (CGH) having amplitude information and phase information recorded by computer operation on a given recording surface, irradiating the computer-generated hologram (CGH) with the first reconstructing illumination light () to generate the first diffracted light () from the computer-generated hologram (CGH) thereby reconstructing a first reconstruction image (O'), simultaneously entering the first diffracted light () and the first reference light () in a first-stage hologram recording material () faced away from the first reconstructed image to record a first-stage hologram () in it, irradiating the recorded first-stage hologram () with the second reconstructing illumination light () to generate the second diffracted light () from the first-stage hologram () thereby reconstructing the second reconstruction image (O″), and simultaneously entering the second diffracted light () and the second reference light () in a second-stage hologram recording material () located near the second reconstructed image (O″) to record the second-stage hologram () in it as a reflection or transmission type volume hologram.