Patent ID: 8420280

Claim:
A hologram recording medium comprising at least a hologram recording material layer, wherein the hologram recording material layer comprises at least a non-photopolymerizable metal oxide and a photopolymerizable compound; and said hologram recording medium has a light transmittance such that at a thickness of 1 mm the light transmittance is 50% or more at a wavelength of 405 nm, or the hologram recording medium has a light reflectance of 25% or more at a wavelength of 405 nm, wherein the metal oxide is a matrix in which the photopolymerizable compound is dispersed, wherein the metal oxide comprises Si and at least one selected from the group consisting of Ta and Zr, wherein a complexing ligand is coordinated to the Ta and/or the Zr; wherein the composition of the hologram recording material is such that when coated at a thickness of 100 μm the light transmittance at 405 nm does not fall after recording exposure with light; and wherein the metal oxide has an organometallic unit in which two aromatic groups are directly bonded to Si.