Patent ID: 8045245

Claim:
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 1 resulting in a first wavelength exposed layer; 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 2 resulting in a first and second wavelength exposed layer; h) removing the second mask; and i) exposing the first and second wavelength exposed layer with coherent actinic radiation of a third wavelength λ 3 resulting in a first, second and third wavelength exposed layer, wherein the first, second and third wavelength exposed layer is a replicate of the volume reflection master hologram.