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US 4,959,283 AGranted
Dry film process for altering wavelength response of holograms
AssigneeE. I. Du Pont de Nemours and Company
InventorsWilliam K. Smothers, Krishna C. Doraiswamy, Mark L. Armstrong, Torence J. Trout
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Abstract
Wavelength response of volume holograms is altered by contact with a dry film diffusion element.
Claims26
A process for forming a volume phase hologram in a substantially solid, transparent, photosensitive film element comprising, in sequence:
- (a) holographically exposing said film element to coherent light to record a volume hologram within said element;
- and
- (b) contacting said film element with a diffusion element for a time sufficient to modify the wavelength of light response by the hologram.
A process for forming a volume hologram in a substantially solid, transparent, photopolymerizable film element comprising, in sequence:
- (a) holographically exposing said film element to coherent light to record a hologram within said element, said film element consisting essentially of:
- (1) approximately 25 to 90% of a polymeric binder selected from the group consisting of polyvinyl acetate, polyvinyl butyral, polyvinyl acetal, polyvinyl formal, interpolymers containing major segments thereof, and mixtures thereof;
- (2) approximately 5 to 60% of an ethylenically unsaturated monomer selected from the group consisting of carbazole containing monomers and a liquid monomer containing one or more phenyl, biphenyl, phenoxy, naphthyl, naphthyloxy, heteroaromatic group containing up to three aromatic rings, chlorine and bromine;
- (3) approximately 0 to 25% of a plasticizer;
- and
- (4) approximately 0.1 to 10% of a photoinitiator system activatable by actinic radiation
- wherein said percentages are weight percentages based on total film weight, and
- (b) contacting said optical element with a diffusion element for a time sufficient to modify the wavelength of light reflected by the reflection hologram.
5 more elements
Dependencies are inferred from the claim text.