Patent ID: 8715887

Claim:
A method of forming image reflection holograms in a holographic recording medium comprising a photochemically active dye dispersed in a deformable optically transparent polymer binder and not chemically attached to the polymer, the holographic recording medium having a medium deformation ratio at a resting state, comprising: exposing the holographic recording medium to interfering coherent light beams to record a first reflection hologram representing an image of a first color comprising interference fringes having a first interference fringe spacing at a first alignment formed from exposed and unexposed photochemically active dye in the holographic recording medium at a first deformation ratio; changing the first interference fringe spacing or alignment to an interference fringe spacing or alignment different from the first interference fringe spacing by changing the deformation ratio to a deformation ratio different than the first deformation ratio, without changing the chemical composition of the holographic recording medium, or adding a material to cause swelling; and recording a second reflection hologram representing an image of a second color in the holographic recording medium at a second deformation ratio.