Patent ID: 8663873

Claim:
An article for recording a hologram, comprising: a holographic recording medium comprising a transparent polymeric binder and a photoreactive dye dispersed therein; and a first compound, disposed over a first surface of the holographic recording medium from which surface the hologram is viewed, wherein said first compound is transparent to light in the wavelength range to which the photoreactive dye is sensitive and which is capable of being converted by exposure to light or heat to a first converted compound that is opaque to light in the wavelength range to which the photoreactive dye is sensitive and transparent to light in a different wavelength range for viewing the hologram, and wherein said first compound is an endoperoxide having the formula: wherein Z represents the atoms necessary to complete an aromatic ring structure, or said first compound is an aryloxy compound according to the formula: wherein R 6 represents a moiety comprising a functional group that can be cleaved from the oxygen atom to which it is attached to form a hydroxyl group, Z represents the atoms necessary to complete an aromatic ring structure, and Z′ represents the atoms necessary to complete a conjugated structure with the proviso that Z′ includes a moiety capable of hydrogen bonding with said hydroxyl group.