Patent ID: 8045245
Filing Date: 2011-10-25
Classification: G03H,Y10S

Abstract:
1. A method for replicating a volume reflection master hologram comprising, in sequence as listed below: a) providing a photosensitive layer having a side and an opposing side, b) placing the side of the photosensitive layer in contact with or proximate to the master hologram; c) placing a first mask in contact with or proximate to the opposing side of the photosensitive layer masking at least one area of the photosensitive layer; d) exposing the photosensitive layer through the first mask with coherent actinic radiation of a first wavelength λ e) removing the first mask; f) placing a second mask in contact with or proximate to the opposing side of the photosensitive layer that is now the first wavelength exposed layer masking at least one area of the first wavelength exposed layer; g) exposing the first wavelength exposed layer with coherent actinic radiation of a second wavelength λ h) removing the second mask; and i) exposing the first and second wavelength exposed layer with coherent actinic radiation of a third wavelength λ