Abstract: A holographic recording medium is provided. The medium includes a recording layer. The recording layer includes a polymer matrix, a polymerizable monomer and a photopolymerization initiator. The polymerizable monomer includes a monomer being expressed in the following general formula (M1), (M2), or (M3). In the above general formulas, “A” and “B” denote a polymerizable substituent group and a nonpolymerizable substituent group, respectively.

Abstract: A holographic recording medium has a recording layer including a radical-polymerizable compound, a first photo-radical polymerization initiator (A) containing a titanocene compound, and a second photo-radical polymerization initiator (B) containing at least one compound selected from the group consisting of an amino acetophenone derivative, an acylphosphine oxide derivative, a benzyl derivative, and a thioxanthone derivative.

Abstract: A hologram recording/reproducing apparatus includes a recording/reproducing optical system that guides at least one of an information beam and a reference beam to an optical recording medium; a spatial light modulator that is arranged in an optical path of the recording/reproducing optical system, and spatially modulates a beam guided via the recording/reproducing optical system to generate the information beam; a first misalignment detecting unit that detects a first misalignment between the recording/reproducing optical system and the spatial light modulator using a beam for detecting the first misalignment; and a first misalignment correcting unit that corrects the first misalignment based on the first misalignment detected by the first misalignment detecting unit.

Abstract: An optical recording medium is provided, which includes a recording layer includes a polymer matrix, a polymerizable compound, a photopolymerization initiator, and a polymerization inhibitor. The polymerization inhibitor is formed of a compound which exhibits a molar absorption coefficient of zero to a light having a first wavelength and generates an acid or a base when exposed to an external stimulus other than the light having the first wavelength, thereby inhibiting the polymerization of the polymerizable compound.

Abstract: A holographic recording medium is provided, which includes a recording layer including a radically polymerizable monomer having an ethylenically unsaturated bond, a photo-acid generator, a photo-radical polymerization initiator, and a polymeric matrix. The polymeric matrix includes a repeating unit expressed by any one of the following chemical formulae.

Abstract: A holographic recording medium is provided, which includes a recording layer containing a three-dimensional crosslinked polymer matrix, a photo-radical generating agent, and a ring-opening polymerizable compound having a radically ring-opening polymerizable alicyclic structure.

Abstract: An optical recording/reproducing apparatus includes an optical recording medium in which a holograms are recorded depending on an incident angle of a reference beam. The reference beam is irradiated to holograms while changing the incident angle to generate a reproduction light beam, and an image patterns are detected by an image pattern detector. The continuously output reproduction image patterns are temporarily stored in an image recorder, and the maximum value of reproduction light intensity is detected to generate a trigger signal. Depending on the trigger signal, an optimal image pattern is extracted from continuous reproduction image patterns, and thus, two-dimensional data is decoded.

Abstract: Disclosed is a holographic recording medium and methods of manufacturing the holographic recording medium. The example of the medium has a recording layer containing a three dimensionally cross-linked polymer matrix including an epoxy resin, a radically polymerizable monomer, and a photo radical polymerization initiator. The radically polymerizable monomer comprises both N-vinylcarbazole (VC) and N-vinylpyrrolidone (VP) or N-vinylcarbazole alone. The weight ratio of N-vinylcarbazole (VC) to the sum of N-vinylcarbazole (VC) and N-vinylpyrrolidone (VP), i.e., (VC/(VC+VP)), is not smaller than 0.75 and not larger than 1.0.

Abstract: A holographic recording medium is provided, which includes a recording layer. The recording layer comprises a radical polymeric monomer having an aromatic ring-containing group and a polymeric group, a polymer matrix having the aromatic ring-containing group, and a photo-radical polymerization initiator.

Abstract: Disclosed is a holographic optical recording medium, comprising a recording layer containing a three dimensionally cross-linked polymer matrix, a radically polymerizable compound, and a photo radical polymerization initiator, the three dimensionally cross-linked polymer matrix comprising a cured material of a reaction product between a diglycidyl ether and an amine, the diglycidyl ether being selected from the group consisting of 1,6-hexanediol diglycidyl ether and diethylene glycol diglycidyl ether.

Abstract: An optical recording medium includes a first substrate having a groove on the side of an outer peripheral portion thereof; a second substrate in contact with the first substrate in the outer peripheral portion; and a recording layer being disposed in a gap between the first substrate and the second substrate and forming a void in cooperation with the first substrate at the portion of the groove.

Abstract: According to an aspect of the present invention, there is provided an optical recording medium including a first substrate, a first adjusting layer, an organic recording layer, a second adjusting layer and a second substrate, sequentially stacked in the mentioned order. The first and second substrates have a refractive index of n1. The organic recording layer has a refractive index of n2. The first and second adjusting layers have a thickness of k and a refractive index distribution in a range of ns from a minimum value on sides contacting with the organic recording layer to a maximum value on sides contacting respectively with the first and second substrates. ns satisfies n2?ns?n1, and k satisfies 5?k?200 nm.

Abstract: A holographic recording medium is provided, which includes a recording layer comprising a three-dimensional cross-linking polymer matrix, a radical polymeric compound, and a photo-radical polymerization initiator. The three-dimensional cross-linking polymer matrix is represented by the following general formula (1): where m is an integer ranging from 3 to 16.

Abstract: Disclosed is a holographic optical recording medium comprising a recording layer having a skeleton structure represented by following general formula (A): where R1 denotes an atomic group selected from the group consisting of a linear or branched alkylene group having 1 to 10 carbon atoms and an arylene group having 1 to 10 carbon atoms, it being possible for a halogen atom or an alkoxy group to be substituted in R1, and each of p and q is 0 or 1.

Abstract: The present invention relates to a powdery photosensitive material comprising evenly dispersed components and free from a variation in quality, and an optical recording medium produced from the photosensitive material. The photosensitive material is produced by a process including freezing a solution of components that constitutes the photosensitive material dissolved in a first solvent and then drying the resultant solid under reduced-pressure.

Abstract: An optical recording medium has a transparent substrate having a first surface and a second surface, a recording layer provided on the first surface of the substrate and on which a light beam is incident to record information as a hologram, and a servo layer provided on the second surface of the substrate and including a phase change layer in which servo information is recorded as a phase change. The servo information is recorded as changes in the phase of the phase change layer.

Abstract: An optical recording medium includes: a recording layer containing a photopolymerization initiator and a photopolymerization compound; and a pigment that generates light through a multiphoton absorption process.

Abstract: A holographic recording medium includes a recording layer containing a matrix material, a photoactive monomer having an ethylenic unsaturated bond dispersed in the matrix material and a photoinitiator, and a polymerization-terminating layer formed on at least one surface of the recording layer.

Abstract: A holographic recording medium has a recording layer, including a matrix formed of a polymer of spiroorthoester of an epoxy compound, a radical-polymerizable compound, and a photoinitiator.

Abstract: A method for storing holographic data in a medium having a reflection layer and a recording layer comprises: recording, rotating and repeating. An interference pattern is recorded at a recording position of the recording layer of the medium in a stationary state. The interference pattern is formed by an interference between an object beam and a reference beam which are irradiated into the recording layer from an opposite side of the reflection layer. The medium is rotated so as to shift the recording position by a distance of n×Sh where n is a positive integer and Sh is a predetermined recording shift amount. The recording and the rotating are repeated alternately.