摘要:
An optimal recording exposure is determined by varying in the first to nth stages the recording exposure with a write laser beam to record a bright pattern image and a dark pattern image in each stage as the first to nth bright pattern images and the first to nth dark pattern images, respectively; irradiating the respective pattern images with a read beam to detect the intensity of a diffracted beam from the central portion of each image of the bright and dark patterns; calculating Sa1/Sb1=SNR1, . . . , and San/Sbn=SNRn, where Sa1 to San are the intensity of a diffracted beam from the first to nth bright pattern images and Sb1 to Sbn are the intensity of s diffracted beam from the first to nth dark pattern images; and determining a recording exposure which is given at the SNRmax being the maximum value of the resulting SNR1 to SNRn.
摘要:
A method for evaluating a hologram image recording medium includes: recording continuously a plurality of fine holograms, each being the same in size as an element hologram, on a hologram image recording medium to be evaluated, using either one of a two-beam interference between a reference beam and a signal beam both being a plane wave and a two-beam interference between a reference beam being a plane wave and a signal beam being a spherical wave; reproducing a diffraction image by irradiating the recorded fine hologram with a plane wave; from intensity distribution data based on a captured diffraction image, determining an intensity distribution data array and a diffracted beam intensity Is, the intensity distribution data array having the same shape and size as those of the fine hologram; and when the diffracted beam intensity Is takes on the maximum value Is(max), determining an SN ratio.
摘要:
A hologram recording material includes a polymerizable monomer (A) that is active in radical polymerization but is substantially inactive in cationic polymerization, a polymerizable monomer (B) that is active in cationic polymerization but is substantially inactive in radical polymerization, and an initiator system (C) that polymerizes at least one of the polymerizable monomer (A) and the polymerizable monomer (B) through irradiation with light. The polymerizable monomer (A) and the polymerizable monomer (B) each have, in its structure, a moiety selected from the group consisting of aromatic rings, halogen atoms other than a fluorine atom, and sulfur atoms not derived from a cyclic sulfide or a mercapto group. A hologram recording medium includes a recording layer composed of the hologram recording material.
摘要:
A photopolymer medium 10 for color hologram image recording, which is formed so that a color image having a high diffraction efficiency can be obtained by exposing the same recording layer to light at a plurality of wavelengths, includes a recording layer 14 that has a recording sensitivity to light in two wavelength regions of a wavelength λ1 and a wavelength λ2. This recording layer 14 is formed from a material in which a transmittance T1 of light at the wavelength λ1 and a transmittance T2 of light at the wavelength λ2 of the recording layer before recording are both less than 80%, T1 T1, and 10%
摘要:
An optical recording medium includes a support substrate and an information recording layer which is supported on the support substrate and made of a photosensitive material which is irradiated with light to be refractive index modulated and amplitude modulated, thereby recording information. The information recording layer has the shape of a coating which is formed by applying a photosensitive material reversibly dissolved or dispersed in an organic solvent onto the support substrate. The photosensitive material in the shape of a coating, as a photopolymer for hologram recording material, contains the cross-linked matrix to maintain the rigidity of the recording material. The optical recording medium is retained in shape with stability, and particularly prevented from being deformed due to shrinkage, thereby facilitating manufacturing of the optical recording medium.
摘要:
The present invention provides a method for producing a homogeneous complex oxide sol comprising Si and a metal other than Si as metal elements, and a method for producing a Si-containing hologram recording material using a homogeneous complex oxide sol. A method for producing a complex oxide sol comprising Si and a metal other than Si as metal elements, the method comprising: mixing a silanol compound with an alkoxide compound of a metal other than Si so that the silanol compound is reacted with the alkoxide compound, thereby yielding a precursor of a complex oxide, and adding water to the complex oxide precursor so as to hydrolyze an alkoxyl group bonded to the metal other than Si, and then making the resulting hydrolysate undergo a condensation reaction, thereby forming a complex oxide. A hologram recording medium (11) having a hologram recording layer (21) comprising the hologram recording material obtained by the production method.
摘要:
A hologram recording medium includes a glass substrate and an information recording layer supported on the glass substrate. The information recording layer is formed of a photosensitive material having a dynamic storage elastic modulus of 1.0×105 Pa or more as measured at 80° C. and a measurement frequency of 1 Hz after interference exposure or post-curing. The photosensitive material is dissolvable or dispersible in an organic solvent, and the information recording layer has sufficient storage stability that allows recorded signals to be stably held for at least 100 hours or longer at 80° C.
摘要:
The present invention provides a hologram recording material which is suitable for volume hologram record and attains high refractive index change, flexibility, high sensitivity, low scattering, environment resistance, durability, low shrinkage and high multiplicity in holographic memory record using not only a green laser but also a blue laser; a process for producing the same; and a hologram recording medium having the hologram recording material. A hologram recording material comprising: a metal oxide containing at least Si and Zr as metals wherein a β-dicarbonyl compound is coordinated to Zr; and a photopolymerizable compound, wherein a mole ratio of the β-dicarbonyl compound to the Zr atom (β-dicarbonyl compound/Zr ratio) is 2/1 or more and 3/1 or less, and a mole ratio of the Si atom to the Zr atom (Si/Zr ratio) is more than 1/1 and 1.15/1 or less in the metal oxide. A hologram recording medium (11) comprising the hologram recording material layer (21).
摘要:
The present invention provides a hologram recording medium which can attain high refractive index change, flexibility, high sensitivity, low scattering, environment resistance, durability, low dimension change (low shrinkage) and high multiplicity in holographic memory record using a blue laser. A hologram recording medium (11) comprising at least a hologram recording material layer, wherein the hologram recording material layer (21) comprises at least a metal oxide and a photopolymerizable compound; and said hologram recording medium has a light transmittance of 50% or more at a wavelength of 405 nm, or a light reflectance of 25% or more at a wavelength of 405 nm.