Holographic color control systems
AssigneeMassachusetts Institute of Technology
InventorsJulie L. Walker, Stephen A. Benton
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Abstract
Holographic color control systems are disclosed for the production of pseudocolor holograms by in-situ sequential swelling of an emulsion and exposure to three color separation images with a single wavelength reference light source. The resulting holograms yield images in three color primaries with excellent color registration and mixing, producing a full gamut of mixed colors, pastels and neutrals with three-dimensional perspective.
Claims17
A method of recording a pseudocolor hologram, the method comprising:
- pretreating a holographic recording medium formed from a polymeric emulsion with an enzymatic agent to reduce crosslinkage of the polymeric emulsion, and thereby reduce swelling anomalies upon exposure to a swelling solution;
- and
- exposing the recording medium to a plurality of color separation images while the volume of the emulsion is varied by swelling to form a set of registered holographic images having different reconstruction wavelengths.
A method of holographic color control, the method comprising:
- treating a holographic emulsion with an enzymatic agent to induce the cleavage of bonds in the emulsion, and thereby reduce swelling anomalies;
- contacting said holographic emulsion with a first swelling solution to produce an increase in thickness of said emulsion;
- exposing said emulsion following contact with said first solution to a first color-separated image to create a recording capable of producing a first reconstruction color image;
- contacting said holographic emulsion with a second swelling solution to produce a variation in the thickness of said emulsion;
- exposing said emulsion following contact with said second solution to a second color separated image to create a recording capable of producing a second reconstruction color image;
- contacting said holographic emulsion with a third swelling solution to produce a further variation in the thickness of said emulsion;
- and
- exposing said emulsion following contact with said third solution to a third color separated image to create a recording capable of producing a third reconstruction color image.
In a method of recording pseudocolor holograms by exposing a polymeric emulsion to a plurality of color separation images while the volume of the emulsion is varied by swelling to form a set of superimposed holographic images having different reconstruction wavelengths, the improvement comprising:
- pretreating the polymeric emulsion with an enzymatic agent to reduce swelling anomalies.
A holographic printer for recording pseudocolor holograms comprising:
- a holographic recording medium formed from a polymeric emulsion;
- a laser source of coherent light;
- a beamsplitter for splitting said laser light into an object beam and a reference beam;
- object beam projection means for projecting a plurality of color-separated images of an object onto said recording medium;
- reference beam projection means for projecting a reference beam onto said medium coincident with the projection of each color-separated image so as to create overlapping exposures with said object images;
- treatment means for treating said emulsion with an enzymatic agent to reduce swelling anomalies;
- and
- swelling means for varying the volume of the emulsion between exposures with said color-separated object images to form a set of superimposed holographic images having different reconstruction wavelengths.
Dependencies are inferred from the claim text.