Holographic medium and process for use thereof
OwnerPradeep K. Dhal, Richard T. Ingwall +3inventors
InventorsPRADEEP K. DHAL, RICHARD T. INGWALL, ERIC S. KOLB, HSIN YU LI, DAVID A. WALDMAN
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Abstract
A holographic recording medium showing little or no shrinkage after exposure comprises an acid generator capable of producing an acid upon exposure to actinic radiation; a binder; a difunctional epoxide monomer or oligomer; and a polyfunctional (i.e., tri- or higher functional) epoxide monomer or oligomer, the difunctional and polyfunctional epoxide monomers or oligomers being capable of undergoing cationic polymerization initiated by the acid produced from the acid generator. The medium is especially useful for holographic data storage applications.
Claims27
A process for preparing a hologram, which process comprises:
- providing a holographic recording medium comprising an acid generator capable of producing an acid upon exposure to actinic radiation;
- a binder;
- a difunctional epoxide monomer or oligomer;
- and a polyfunctional epoxide monomer or oligomer, the difunctional and polyfunctional epoxide monomers or oligomers being capable of undergoing cationic polymerization initiated by the acid produced from the acid generator;
- and
- passing into said medium a reference beam of coherent actinic radiation to which the acid generator is sensitive and an object beam of the same coherent actinic radiation, thereby forming within said medium an interference pattern and thereby forming a hologram within said medium.
A holographic recording medium comprising an acid generator capable of producing an acid upon exposure to actinic radiation;
- a binder;
- a difunctional epoxide monomer or oligomer;
- and a polyfunctional epoxide monomer or oligomer, the difunctional and polyfunctional epoxide monomers or oligomers being capable of undergoing cationic polymerization initiated by the acid produced from the acid generator.
Dependencies are inferred from the claim text.