Abstract: A method of recording a holographic record is described. According to this method, a holographic recording medium is exposed to a desired pattern, shape, or image from a coherent light source emitting light at one or more wavelengths to which the holographic recording medium is sensitive. In this method, light having the desired pattern, shape, or image to which the holographic recording medium is exposed is diffracted by a spatially homogeneous optical diffraction element so that the holographic recording medium is exposed to a plurality of interfering light beams, thereby forming a holographic record in the holographic recording medium. Holographic recording articles are described that include a holographic recording medium and a spatially homogeneous optical diffraction element.

Abstract: The present disclosure relates to optical media and the formation and use of such media. In certain embodiments the optical media or a composition suitable for such media includes a polymeric matrix or substrate. A dye, such as an energy transfer dye is chemically appended to the polymeric matrix or substrate, such as by one or more covalent bonds.

Abstract: The present invention provides a hologram recording material which is not required to be subjected to pre-exposure treatment at the time of recording, attains high refractive index change, high sensitivity, low scattering, environment resistance, durability, low dimensional change, and high multiplicity, and is suitable for volume hologram recording. Also, the present invention provides a hologram recording medium. A hologram recording material comprising a matrix material having a softening temperature of 50° C. or higher, and a photopolymerizable monomer which is in a liquid phase state at room temperature. The matrix material is preferably contained in an amount of 50% by weight or more and 90% by weight or less of the whole of the hologram recording material. A softening temperature of the hologram recording material is preferably 0° C. or higher.

Abstract: A volume holographic imaging system, apparatus, and/or method enables the projection of a two-dimensional (2D) slice of a four-dimensional (4D) probing object. A 4D probing source object is illuminated to emit or scatter an optical field. A holographic element having one or more recorded holograms receives and diffracts the optical field into a diffracted plane beam having spectral information. A 4-f telecentric relay system includes a pupil filter on the relayed conjugate plane of the volume hologram and images the pupil of the volume hologram onto the front focal plane of the collector lens. A collector lens focuses the diffracted plane beam to a 2D slice of the 4D probing source object. The focused 2D slice is projected onto a 2D imaging plane. The holographic element may have multiple multiplexed holograms that are arranged to diffract light from the corresponding slice of the 4D probing source object.

Abstract: A sensitive liquid crystalline polymeric material suitable for the reflective hologram recording and the preparing method thereof are disclosed. The material includes a base film, a buffer layer coated on one side of the base film, a sensitive polymeric layer coated on the other side of the buffer layer and a protective layer coated on the surface of the sensitive polymeric layer.

Abstract: Dynamic range enhancing dopants for photopolymeric media are described. Also described are optical articles using these dopants and methods for making such optical articles.

Abstract: Disclosed is a surface relief structure. The structure includes a recording medium configured to be structurally modified when exposed to interfering and non-interfering portions of radiation beams, the structurally modified recording medium including, when viewed in a two-dimensional cross-section along one of the axes of the recording medium a plurality of equally spaced steps of fine-sized periodicity superimposed upon a plurality of deep depressions of substantially coarse-sized periodicity. The structurally modified recording medium is configured to produce in reflection single and multiple colors in a broad spectral range when illuminated by a source of light.

Abstract: Disclosed is a volume phase hologram recording material of high sensitivity, high contrast, and excellent record retention properties and also disclosed is a volume phase hologram recording medium using the said material. The volume phase hologram recording material mainly contains a three-dimensional crosslinked polymer matrix, a radically polymerizable monomer, and a photoradical polymerization initiator. The three-dimensional crosslinked polymer matrix is formed from a matrix-forming compound having two photoradically polymerizable unsaturated groups and two non-photoradically polymerizable hydroxyl groups represented by the following general formula (1) and another matrix-forming compound having no photoradically polymerizable group.

Abstract: A method of recording a volume holographic image is described in which a holographic recording medium containing a photoreactive dye is exposed to a plurality of coherent light sources emitting at a wavelength to which the dye is sensitive, thereby forming an interference fringe pattern therein. The photoreaction occurring in the areas of constructive interference generates a periodic array of photoreacted areas of the dye and unreacted areas of the dye. This generated interference fringe pattern may contain, but does not have to contain any image or other encoded information. Selected areas of the interference fringe pattern are then exposed to actinic radiation in such a manner to partially or fully bleach, remove, or deactivate the photoreactive dye fringe pattern, thereby producing a holographic pattern, shape, or image formed by areas of the interference fringe pattern that were not bleached, removed, or deactivated.

Abstract: A holographic system for recording and reading information is provided. The system includes at least one laser for providing a laser beam. The system also includes a subsystem configured for multi-wavelength operation of said holographic system and recording micro-holograms at different wavelengths in substantially non-overlapping volumes of a holographic medium.

Abstract: A method of recording holographic information includes recording a hologram mark and a homogeneous mark in a holographic data storage medium with a volume to alternatively locate the hologram mark and the homogeneous mark. The hologram mark has a varied refractive index distribution due to constructive/destructive interferences between two light beams and indicates information, while the homogeneous mark has a more uniform refractive index distribution than the hologram mark.

Abstract: A production method is provided by which a copied volume hologram from a multi-layer master is later customized by utilization of the color tuning properties of the light-curable materials used for the application onto personal documents. These holographic individual data, such as a passport photo, are also separately detectable, without the holographic elements copied from the master, that are visible under other viewing angles, impairing the visibility of the individual data. The volume hologram overlay obtained by this method is applied on personal and valuable documents to increase protection against forgery, possesses superimposed optically variable items of information that are separately visible under different viewing angles and give a defined color change under different view angles, wherein at least one of these items of optical information represents individual personal data, in particular a passport photograph.

Abstract: A system and method for producing a Bragg grating. A system and a method for apodization of gratings. The system and method for producing a grating include splitting a beam and reflecting one split beam an odd number of times and the other an even number of times before the two are allowed to interfere within a photosensitive target. When the original beam is scanned in predetermined directions, the split beams scan the target while interfering within the target. The original beam is scanned such that an intersection point of the reflected split beams moves along a bisector of the two split beams. In the system and method for apodizing, scanning of the interfering beams along a length of the target may be controlled to yield a substantially uniform average refractive index for the apodized grating that is being recorded in the photosensitive target medium.

Abstract: There is provided volume holographic data recording media having a recording layer which is capable of recording interference fringes generated by interference of light having excellent coherence as fringes having different refractive indexes and undergoes holographic data recording by an amount of spatial shift distance of not more than 3 ?m which is smaller than that of conventional media.

Abstract: A sensor for the detection of an analyte, comprising a holographic element comprising a medium and a hologram disposed throughout the volume of the medium, wherein an optical characteristic of the hologram changes as a result of a variation of a physical property occurring throughout the volume of the medium, wherein the medium is obtainable by formation in situ in the presence of a pore-forming agent, wherein the agent is not present in the sensor or does not react with the analyte and the sensor.

Abstract: An optical medium is provided. The optical medium comprises: a diffusion-controlling matrix framework; at least one photoactive monomer attached to the diffusion-controlling matrix framework in a first state of the optical medium, wherein the at least one photoactive monomer is released from the diffusion-controlling matrix framework by photo cleavage, producing a second state of the optical medium, in which diffusion of the photoactive monomer through the optical medium is possible; and wherein the at least one photoactive monomer is then polymerized or reattached to the diffusion-controlling matrix, giving a third state of the optical medium, when exposed to photo-polymerizing light.

Abstract: An optical information reproducing method and apparatus using an angle-multiplex recording type holographic memory. An optical information recording medium is exposed to a reference beam, the intensity of a diffracted beam diffracted in the medium is detected by a photodetector, an error signal is generated based on a value obtained by differentiating the detected intensity of the diffracted beam based on an angle of the reference beam, so that a reference beam angle control element is subjected to a feedback control.

Abstract: A holographic data storage medium and an apparatus and method for recording/reproducing holographic data using the same. The holographic data storage medium includes a substrate; a holographic recording layer disposed on the substrate; and a cover layer covering the holographic recording layer. The holographic recording layer includes a data recording region including a plurality of data layers to which data is recorded, the data recording region in which interference fringes due to first and second beams are formed in different data layers in a depthwise direction; and a layer discrimination region for providing discrimination between the data layers.

Abstract: An optical scanning apparatus includes a light source configured to emit a plurality of laser beams from a plurality of light emitting parts, a beam shaping unit configured to shape the laser beams emitted from the light source, a detection unit provided outside the light source and configured to detect an amount of a laser beam that is not shaped by the beam shaping unit in the laser beams emitted from the light source in an area outside the beam shaping unit, and a light amount control unit configured to control amounts of the laser beams emitted from the light source based on a detection result detected by the detection unit. The detection unit includes a plurality of light-sensitive elements. The light amount control unit controls the light amounts of the laser beams emitted from the light source based on detection results of the light-sensitive elements.

Abstract: Urethane acrylates of the general Formula (I), corresponding salts, solvates or solvates of a salt thereof: wherein R1, R2, R3, R4 and R5 each independently represent a substituent selected from the group consisting of hydrogen, halogens, C1-6-alkyls, trifluoromethyl, C1-6-alkylthios, C1-6-alkylselenos, C1-6-alkyltelluros, and nitro groups, with the proviso that at least one of R1, R2, R3, R4 and R5 is not hydrogen; R6 and R7 each independently represent a substituent selected from the group consisting of hydrogen and C1-6-alkyls; and A represents a saturated or unsaturated or linear or branched C1-6-alkyl radical or a polyalkylene oxide radical having 2-6 ethylene oxide or propylene oxide units; processes for producing and methods of using the same.

Abstract: A metal identification platelet equipped with an identification code, while the identification code comprises a hologram. A method of producing the identification platelet with the identification code, including the following steps: A shield from an electro-insulation material is formed on a shim with a holographic motif. Then, the shim is galvanized in the places not covered by the shield from the electro-insulation material. And the completed metal identification platelets are removed from the shim.

Abstract: The present invention provides a fluorine-containing volume holographic data recording material making it unnecessary to provide a step of eliminating a specific solvent even in the case of a thick film, and having high hologram performance and good dynamic range. There is provided a composition comprising a base polymer (a), a liquid monomer (b) and a photo-initiator (c), wherein the base polymer (a) is an amorphous polymer comprising a fluorine-containing monomer as a structural unit and having a fluorine content of 26 to 80% by mass, the liquid monomer (b) comprises at least one liquid monomer (b1) initiating polymerization by means of activated species generated from the photo-initiator (c), the photo-initiator (c) is a compound causing the liquid monomer (b1) to initiate polymerization by exposure to light having excellent coherence and, and a refractive index of the liquid monomer (b) is higher than an average refractive index of a mixture of the base polymer (a) and the photo-initiator (c).

Abstract: An optical recording material and methods of making such material is provided. The material comprises of a dewar benzene monomer, with at least two cross-linkable groups, a sensitizer, a cross-linker, and an initiator. The material does not require a binder or a co-sensitizer. The material can be fabricated by an exceedingly easy technique that offers high photosensitivity, high diffraction efficiency, millimeter thickness, and high dynamic range.

Abstract: A computer generated hologram includes a plurality of cells which form a light intensity distribution on a predetermined plane. The plurality of cells includes a plurality of first cells including isotropic media and anisotropic media, and a plurality of second cells including anisotropic media alone. The plurality of cells change a phase of incident light which impinges on each of the plurality of cells to form a phase distribution including N phases (N is the number of phases, N?2) for each of a wavefront of a linearly polarized light component in a first direction and a wavefront of a linearly polarized light component in a second direction perpendicular to the first direction.

Abstract: A monocular holographic storage device or system to provide for compact recording and/or reading of data pages in a holographic storage medium. Also provided are methods for carrying out such data storage and/or data recovery using a monocular holographic storage device or system. Further provided are articles comprising holographic storage media for recording or for reading recorded data using such devices or systems.

Abstract: A data storage device including: a plastic substrate having a plurality of volumes arranged in tracks along a plurality of vertically stacked, laterally extending layers therein; and, a plurality of micro-holograms each contained in a corresponding one of the volumes; herein, the presence or absence of a micro-hologram in each of the volumes is indicative of a corresponding portion of data stored.

Abstract: There are provided optical data storage media and methods of optical data storage using the same. The optical data storage media comprises a non-linear sensitizer capable of absorbing actinic radiation to cause upper triplet energy transfer to a reactant that undergoes change upon triplet excitation. The refractive index change (?n) of the medium is at least about 0.005, or even at least about 0.05.

Abstract: An optical data storage medium is provided. The optical data storage medium includes a polymer matrix; a reactant capable of undergoing a change upon triplet excitation, thereby causing a refractive index change; and a non-linear sensitizer capable of absorbing actinic radiation to cause upper triplet energy transfer to said reactant. The refractive index change capacity of the medium is at least about 0.1. The reactant comprises polyvinyl chlorocinnamate, polyvinyl methoxycinnamate, or a combination thereof.

Abstract: A see-through display including a light source for emitting light, a projection optical system for projecting the light emitted by the light source, and a volume hologram for deflecting the light projected by the projection optical system. The volume hologram has a linear expansion coefficient of ? (/° C.) and interference fringes recorded with recording light having a wavelength of ? (nm). The wavelength of the light emitted by the light source has a temperature dependency of K (nm/° C.), and the wavelength ? (nm) and the temperature dependency K (nm/° C.) satisfy the relationship of 0?K/??2?.

Abstract: Disclosed is a volume phase hologram recording material characterized by excellent photosensitivity, low cure shrinkage, high transparency, and particularly good storage stability and also disclosed is a recording medium prepared therefrom. Further disclosed is a photosensitive resin composition for volume phase hologram recording that comprises a soluble aromatic copolymer (A), a photoradically polymerizable compound (B) capable of copolymerizing with the soluble aromatic copolymer (A), a photopolymerization initiator (C), and a polymer binder (D). The soluble aromatic copolymer (A) has a structural unit of a divinyl aromatic compound and a structural unit of a monovinyl aromatic compound, comprises 10 to 90 mol % of a structural unit represented by the following formula (a1), has a hydroxyl equivalent of 100 to 30,000 g/equiv, a number average molecular weight (Mn) of 400 to 30,000, and a molecular weight distribution (Mw/Mn) of 10 or less, and accounts for 5 to 60 wt % of the composition.

Abstract: 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 ?1 and a wavelength ?2. This recording layer 14 is formed from a material in which a transmittance T1 of light at the wavelength ?1 and a transmittance T2 of light at the wavelength ?2 of the recording layer before recording are both less than 80%, T1<T2 is satisfied, a transmittance T1after of light at the wavelength ?1 after recording has been performed with light at only the wavelength ?2 satisfies T1after>T1, and 10%<T1after<80%.

Abstract: Disclosed herein is a recording and reproducing device including: a light source; an intensity modulating section; a polarization beam splitter; a selective polarization direction controlling section; a linearly polarized light/circularly polarized light converting section; and a driving controlling section.

Abstract: The present invention relates to a system, as well as articles and holographic recording medium comprising the system, where the system comprises: a polymerizable component comprising at least one photoactive polymerizable material; and a photoinitiator component comprising at least one photoinitiator for causing the polymerizable component to polymerize to thereby form a plurality of holographic gratings when activated by exposure to a photoinitiating light source; wherein when a portion of the polymerizable component has been polymerized to form at least one holographic grating, the unpolymerized portion of the polymerizable component is resistant to further polymerization when not exposed to the photoinitiating light source. The present invention also provides methods for forming at least one holographic grating in a holographic recording medium having such a photopolymerizable system.

Abstract: An all-polymer grating microstructure device that exhibits a zero-order reflection under white light comprises a first polymer having a first refractive index and configured as a microstructure embedded within a second polymer having a second refractive index, each of the polymers of the first and second polymers at least translucent to white light with the proviso that the refractive index of the first polymer is at least 0.05 greater than the refractive index of the second polymer.

Abstract: A three-dimensional holographic display device includes a holographic display medium constituted by a photorefractive organic composition, and an optical system for recording and reproducing a holographic image using the holographic display medium. The photorefractive organic composition includes a photorefractive organic polymer having a tri-alkyl amino side-chain group.

Abstract: There are provided compositions, optical data storage media and methods of using the optical data storage. The compositions comprise a non-linear sensitizer comprising one or more platinum ethynyl complexes capable of absorbing actinic radiation to cause upper triplet energy transfer to a reactant that undergoes a photochemical change upon triplet excitation.

Abstract: Provided is a transmission-type volume hologram recording medium for use in a two-beam hologram recording system, which has a high diffraction efficiency and is capable of significantly reducing the intensity of higher-order diffracted light, which causes a noise, than first-order diffracted light. The transmission-type volume hologram recording medium includes two facing substrates of dissimilar materials and, held between them, a volume hologram recording layer of a volume hologram recording photosensitive composition. The substrates holding the volume hologram recording layer therebetween preferably have transparency in the visible light region and have thicknesses each from 2 to 2000 ?m. The difference in refractive index between the two substrates holding the volume hologram recording layer therebetween is preferably from 0.001 to 0.5. The difference in thickness between the two substrates holding the volume hologram recording layer therebetween is preferably from 1 to 1500 ?m.

Abstract: A method of making a hologram includes recording a first hologram in a holographic recording medium at a first deformation ratio; changing the first deformation ratio to a second deformation ratio that is different from the first deformation ratio; and recording a second hologram in the holographic recording medium at the second deformation ratio to form a recorded holographic medium.

Abstract: There is provided an exposing device including a light emitting element array of light emitting elements arrayed in a row along a predetermined first direction; a hologram recording layer in which hologram elements are multiplex recorded such that each of the hologram elements corresponds to one of the light emitting elements and diffracts an emission beam from the light emitting element and converges the light onto a light exposure plane, such that a focused beam spots are formed on the light exposure plane in a row along the first direction; and a first transmission control section, disposed at the light incident side of the hologram recording layer, provided with a structure in which light blocking sections and light transmitting sections are alternately arrayed along a second direction intersecting with the first direction, and selectively transmitting in the second direction light passing along the optical path of the reference beam.

Abstract: The invention disclosed here teaches methods to fabricate and utilize a non-dispersive holographic wavelength blocker. The invention enables the observation of the Raman signal near the excitation wavelength (˜9 cm?1) with the compactness of standard thin film/holographic notch filter. The novelty is contacting several individual volume holographic blocking notch filter (VHBF) to form one high optical density blocking filter without creating spurious multiple diffractions that degrade the filter performance. Such ultra-narrow-band VHBF can be used in existing compact Raman instruments and thus will help bring high-end research to a greater number of users at a lower cost.

Abstract: A data storage device including: a plastic substrate having a plurality of data volumes arranged along tracks in a plurality of stacked layers; a plurality of micro-holograms each contained in a corresponding one of the data volumes; a plurality of complementary volumes, each corresponding to and being substantially aligned with one of the data volumes; a plurality of micro-holograms each contained in a corresponding one of the complementary volumes; wherein, the presence or absence of a micro-hologram in each of the data volumes is indicative of a corresponding portion of data stored; and, the ones of the complementary volumes corresponding to the ones of the data volumes containing a micro-hologram do not contain a micro-hologram; and the ones of the complementary volumes corresponding to the ones of the data volumes not containing a micro-hologram contain a micro-hologram.

Abstract: The present invention provides a hologram recording material which is suitable for volume hologram record and can attain high refractive index change, flexibility, high sensitivity, low scattering, environment resistance, that is, storage stability, durability, low dimensional change (low shrinkage) and high multiplicity in holographic memory record using not only a green laser but also a blue laser. A hologram recording material comprising: a metal oxide matrix; and a photopolymerizable compound which has at least one (meth)acrylamide group as a photo-reactive group, and has a polyalkylene glycol unit represented by the following formula: —(RO)n— wherein R represents a lower alkylene group, and n represents the number of repeating units of alkylene oxide.

Abstract: The present invention provides an article comprising: a binder component, a polymerizable component; and a photoinitiator component comprising at least one photoinitiator that causes the polymerizable component to form a polymer or co-polymer when a portion of the polymerizable component is exposed to a light source. The present invention also provides a method for making such an article, and a method and a system for holographically recording a spatial light distribution to such an article. The present invention also provides an article comprising: a binder component and a photoactive component, a method of making such an article, a method of recording to such an article and a system for recording to such an article.

Abstract: Described are holographic storage mediums and method of making holographic storage mediums. The holographic storage mediums may have write components that bind to the matrix to form a pattern in the media. The holographic storage mediums may also be rewriteable.

Abstract: High performance media suitable for recording with a blue laser is disclosed. The blue-sensitized holographic media provides greater dynamic range and higher sensitivity than previously disclosed blue-sensitized holographic media. These media can be used for diverse applications such as data storage where the articles provide denser data storage and more rapid hologram writing times or for optical waveguides where the articles provide greater optical confinement and more rapid manufacturing times.

Abstract: In the specification and drawings, a collinear holographic storage medium is described and shown with a recording layer, wherein the lateral linear thermal expansion coefficient of the recording layer is substantially the same as the linear thermal expansion coefficient of the material of the recording layer.

Abstract: The present invention relates to a volume phase hologram recording material excellent in transparency, sensitivity, low curing shrinkage, and transparency, a volume phase hologram recording medium, and a volume phase hologram. A photosensitive resin composition for volume phase hologram recording contains a low-molecular-weight solvent-soluble aromatic copolymer (A) having a structural unit of a divinyl aromatic compound and a structural unit of a monovinyl aromatic compound, a photoradical polymerizable compound (B) which is copolymerizable with the soluble aromatic copolymer (A), and a photopolymerization initiator (C) as essential components. The photosensitive resin composition further contains, one kind or more of a polymer binder (D) and a plasticizer (E), and the soluble aromatic copolymer (A) is incorporated in an amount of 5 to 60% by weight.

Abstract: The present invention is directed to a film forming, photoactive, homogeneously mixed material comprising a complex prepared from (a) at least one ionic photosensitive compound which may undergo a photoreaction, selected from photoisomerizations, photocycloadditions and photoinduced rearrangements, and/or (a?) at least one photosensitive polyelectrolyte (“second polyelectrolyte”) carrying residues which may undergo said photoreaction, and (b) at least one (“first”) polyelectrolyte carrying charges which are opposite to those of the active groups of the photosensitive material. This material has unique photochemical properties in that non-scattering, optically clear films may prepared therefrom which allow light-induced generation of optical anisotropy and of topological surface structures, e.g. such as surface relief gratings (SRG).

Abstract: 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 an aromatic carboxylic acid compound is coordinated to Zr; and a photopolymerizable compound. The aromatic carboxylic acid compound is, for example, toluic acid. A hologram recording medium (11) comprising the hologram recording material layer (21).

Abstract: A hologram recording apparatus (300) is provided with: a recording device (100) for recording record information into a hologram recording medium (1); a measuring device (325) for measuring a time elapsed from when the recording of the record information is stopped to when the recording of the record information is restarted; a first controlling device (354) for controlling the recording device to multiplex-record the record information, if the measured elapsed time is shorter than a time length in which the record information can be multiplex-recorded; and a second controlling device (354) for controlling the recording device not to multiplex-record the record information, if the measured elapsed time is longer than the time length in which the record information can be multiplex-recorded.