A method for storing a holographic data derived therefrom and objects with an improved data memory service life

摘要

A method for storing holographic data, wherein said method comprising:Step (a) providing an optically transparent substrate, comprising a photochemically active dye with the structure (i) wherein r¹ and r³ independently is an aliphatic c₁-C.₃₀-Radical, a cycloaliphatic c₃-C.₃₀-Radical or an aromatic c₂-C.₃₀-Radical r is² Hydrogen, an aliphatic c₁-C.₃₀-Radical, a cyclo - of aliphatic c₃-C.₃₀-Radical or an aromatic c₂-C.₃₀-Radical, and at least one of the groups r¹ and r³ in the vicinity of the nitrone - oxygen a group ---X - (p1)a, wherein x in each occurrence is independently an oxygen atom, a nitrogen atom, a sulfur atom or a selenium atom, p being¹ an organic protective group is and ‘ a "1 or 2 is;Step (b) irradiating the optically transparent substrate with a holographic interference pattern, wherein the pattern comprises a first wavelength and an intensity, both of which are sufficient in order, within a volume element dv of the substrate, at least a part of the photochemically active dye in a photograph product, and generating inside of the irradiated volume element concentration levels - variations of the..