The invention relates to a method for selecting compounds which can be used as additives in photopolymer formulations for producing light holographic media, and to photopolymer formulations which contain at least one softener which are selected according to the claimed method. The invention also relates to the use of photopolymer formulations for producing holographic media.

The invention relates to a method for selecting compounds which can be used as additives in photopolymer formulations for producing light holographic media, and to photopolymer formulations which contain at least one softener which are selected according to the claimed method. The invention also relates to the use of photopolymer formulations for producing holographic media.

Photosensitive polymers for recording volume holograms, anisotropic volume holograms, and corresponding volume holographic elements are described herein.

The present invention provides a means for suppressing an occurrence of a ghost by enhancing diffraction efficiency of a holographic optical element having a volume hologram recording layer. The present invention is a holographic optical element including: a volume hologram recording layer containing a photopolymer; and at least one adjacent layer which is in contact with the volume hologram recording layer and contains a resin, wherein a diffraction grating is formed so as to extend from the volume hologram recording layer to the adjacent layer.

The invention relates to a method for selecting compounds which can be used as additives in photopolymer formulations for producing light holographic media, and to photopolymer formulations which contain at least one softener which are selected according to the claimed method. The invention also relates to the use of photopolymer formulations for producing holographic media.

The invention relates to a method for selecting compounds which can be used as additives in photopolymer formulations for producing light holographic media, and to photopolymer formulations which contain at least one softener which are selected according to the claimed method. The invention also relates to the use of photopolymer formulations for producing holographic media.

Provided is a hologram recording medium that can achieve suppression of deterioration of the storage stability in an unexposed state. The hologram recording medium includes a base material and a photosensitive layer. The oxygen permeability of the base material measured in an environment at 23? C. and 0% RH is more than 0.1 cm.sup.3.Math.(m.sup.2.Math.day.Math.atm).sup.?1 and 10000 cm.sup.3.Math.(m.sup.2.Math.day.Math.atm).sup.?1 or less. The photosensitive layer contains a polymerizable compound, and the polymerizable compound contains a compound represented by a specific general formula.

Provided is a hologram recording medium that can achieve suppression of deterioration of the storage stability in an unexposed state. The hologram recording medium includes a base material and a photosensitive layer. The oxygen permeability of the base material measured in an environment at 23? C. and 0% RH is more than 0.1 cm.sup.3.Math.(m.sup.2.Math.day.Math.atm).sup.?1 and 10000 cm.sup.3.Math.(m.sup.2.Math.day.Math.atm).sup.?1 or less. The photosensitive layer contains a polymerizable compound, and the polymerizable compound contains a compound represented by a specific general formula.

An optical information storage medium includes a substrate and a multilayer polymeric film. The multilayer polymeric film has a first surface and an opposite second surface that extend the length of the multilayer polymeric film. The second surface is adhered to a surface of the substrate. The multilayer polymeric film includes a plurality of coextruded alternating polymeric active data storage layers and polymeric buffer layers.

A nonlinear light absorption material includes a compound represented by the following formula (1) as a main component:

##STR00001##

in the formula (1), R.sup.1 to R.sup.10 are each independently a hydrogen atom, a halogen atom, a saturated hydrocarbon group, a halogenated alkyl group, an unsaturated hydrocarbon group, a hydroxyl group, a carboxyl group, an alkoxycarbonyl group, an aldehyde group, an acyl group, an amide group, a nitrile group, an alkoxy group, an acyloxy group, a thiol group, an alkylthio group, a sulfonate group, an acylthio group, an alkylsulfonyl group, a sulfonamide group, a primary amino group, a secondary amino group, a tertiary amino group, or a nitro group.