Hologram fabrication process, and hologram fabricated by that process

摘要

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 (2) to generate the first diffracted light (3) from the computer-generated hologram (CGH) thereby reconstructing a first reconstruction image (O′), simultaneously entering the first diffracted light (3) and the first reference light (4) in a first-stage hologram recording material (11) faced away from the first reconstructed image to record a first-stage hologram (11) in it, irradiating the recorded first-stage hologram (11) with the second reconstructing illumination light (5) to generate the second diffracted light (6) from the first-stage hologram (11) thereby reconstructing the second reconstruction image (O″), and simultaneously entering the second diffracted light (6) and the second reference light (7) in a second-stage hologram recording material (21) located near the second reconstructed image (O″) to record the second-stage hologram (21) in it as a reflection or transmission type volume hologram.

主权项

1. A hologram fabrication method, characterized by comprising steps of fabricating a computer-generated hologram having amplitude information and phase information recorded by computer operation on a given recording surface, irradiating said computer-generated hologram with first reconstructing illumination light to generate first diffracted light from said computer-generated hologram thereby reconstructing a first reconstruction image, simultaneously entering said first diffracted light and first reference light in a first-stage hologram recording material faced away from said first reconstructed image to record a first-stage hologram in it, irradiating the recorded first-stage hologram with second reconstructing illumination light to generate second diffracted light from said first-stage hologram thereby reconstructing a second reconstruction image, and simultaneously entering said second diffracted light and second reference light in a second-stage hologram recording material located near said second reconstructed image to record a second-stage hologram in it as a reflection or transmission type volume hologram, wherein
a computer-generated hologram recorded by use of object light that spreads out from a point light source set on a recording object in a given one-dimensional direction only is used as said computer-generated hologram, and when recording said first-stage hologram, diffusing illumination light that diffuses only in a direction orthogonal to said one-dimensional direction is used as said first reconstructing illumination light.