Complex holograms, method of making and using complex holograms
View Patent ↗A method of making a hologram includes recording a first hologram in a holographic recording medium at a first deformation ratio; changing the first deformation ratio to a second deformation ratio that is different from the first deformation ratio; and recording a second hologram in the holographic recording medium at the second deformation ratio to form a recorded holographic medium.
1. 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.
2. The method of claim 1 , wherein the second deformation ratio is equal to the medium deformation ratio.
3. The method of claim 1 , further comprising
recording a reflection third hologram representing an image of a third color in the holographic recording medium at a third deformation ratio.
4. The method of claim 1 , wherein the recording of the second hologram creates second interference fringes having a second spacing and second alignment, and wherein the first spacing is different than the second spacing and/or the first alignment is different than the second alignment.
5. The method of claim 1 , further comprising recording a third hologram at the first deformation ratio or the second deformation ratio, wherein the third hologram has third interference fringes with a third fringe alignment that is different than a fringe alignment of first interference fringes or second interference fringes that are recorded at the same deformation ratio.
6. The method of claim 1 , wherein the first hologram and the second hologram are recorded at the same laser wavelength.
7. The method of claim 1 , further comprising fixing the holographic recording medium at a hologram reconstruction deformation ratio other than 1.
8. The method of claim 1 , wherein the changing of the deformation ratio comprises a method selected from the group consisting of compressing, expanding, and combinations comprising at least one of the foregoing.
9. The method of claim 1 , further comprising processing the recorded holographic medium in a manner to inhibit subsequent changes in deformation ratio.
10. The method of claim 1 , further comprising processing the recorded holographic medium in a manner to facilitate (such as incorporating holographic recording medium in a device) user-desired changes in deformation ratio.
11. The method of claim 1 , further comprising repeating changing of the deformation ratio and recording holograms to attain an animation hologram.
12. The method of claim 1 , wherein the image hologram is a volume reflection hologram.
13. A method of making a hologram in a holographic recording medium, which allows visualization of said hologram without additional processing, comprising a photochemically active dye dispersed in a deformable optically transparent polymer binder and not chemically attached to the polymer, comprising: simultaneously recording a image hologram in the holographic recording medium at multiple deformation ratios such that the hologram has interference fringes comprising multiple fringe spacings and/or multiple fringe angles.
14. The method of claim 13 , further comprising using continuous deformation of the holographic recording medium to attain the multiple deformation ratios.
15. The method of claim 13 , further comprising using discrete deformation of the holographic recording medium to attain the multiple deformation ratios.
16. The method of claim 13 , wherein the image hologram is a volume reflection hologram.
17. A method of forming image reflection holograms in a holographic recording medium, comprising:
exposing the holographic recording medium to interfering coherent light beams to record a first reflection hologram representing an image of a first color in the holographic recording medium at a first deformation ratio, wherein the holographic recording medium comprises a photochemically active dye dispersed in a deformable optically transparent polymer binder and not chemically attached to the polymer;
mechanically changing the deformation ratio of the holographic recording medium to a second deformation ratio without addition of a material to cause swelling that is different from the first deformation ratio; and
recording a second reflection hologram representing an image of a second color in the holographic recording medium at the second deformation ratio to form a recorded holographic medium.
18. The method of claim 17 , wherein the changing of the first deformation ratio to the second deformation ratio comprises a method selected from the group consisting of compressing, expanding, and combinations comprising at least one of the foregoing.
19. The method of claim 17 , wherein changing the first deformation ratio to the second deformation ratio comprises changing an amount of compression exerted on the holographic recording medium.
20. The method of claim 18 , wherein the image hologram is a volume reflection hologram.