KEYWORDS: Holography, Holograms, Digital holography, Photopolymer media, Data storage, Refractive index, Multiplexing, High dynamic range imaging, Semiconductor lasers, Diffraction
We report new photopolymer media for holographic data storage (HDS) at blue wavelengths (~ 405 nm), which show great promise for a practical HDS system.
An easily fabricated organic holographic media is presented that is rewriteable, sensitive to 407nm light, and that exhibits high storage capacity, sensitivity, and environmental robustness.
Archival data-storage based on holographic methods requires high performance recording materials. Here, we describe an epoxy-photopolymer composite material which is sensitive to visible light and can be fabricated as thick films. These materials are prepared by combining photopolymerizable vinyl monomers with a liquid epoxy resin and an amine hardener. As the epoxy cures at room temperature, a solid matrix is formed which surrounds the unreacted photopolymer. These vinyl monomers are subsequently photopolymerized during hologram recording. Typically the material consists of a low index matrix, composed of diethylenetriamine and 1,4- butanediol diglycidyl ether, and a high index photopolymer mixture of N-vinylcarbazole and N-vinyl-2-pyrrolidinone. Because the polymers can be prepared in thick formats, narrow angular bandwidth holograms with high diffraction efficiency can be recorded. A dynamic range up to 13 has been measured in these materials.
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