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7453785 |
Method for generating a holograrm on a disc surface
A method for generating a hologram on a disc surface provides for the use of calibration spots burned onto a disc with an accuracy greater than one half wavelength of light.
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7443553 |
Holographic sensors and their production
An array of discrete sensors disposed on a substrate, each sensor comprising a holographic support medium and a hologram disposed throughout the volume of the medium, whereby interaction with an...
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7440152 |
Holographic disk medium with servo marks
The present invention relates to a holographic disk medium ( 1 ) with servo marks ( 7 ), and more specifically to a holographic disk medium ( 1 ) having a common reflective layer ( 3 ) for...
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7439009 |
Three-dimensional optical data storage in fluorescent dye-doped photopolymer
A host matrix—normally a binder such as cellulose acetate propionate in a solvent such as acetone—contains a radiation-polymerizable photopolymer—normally a monomer like dipentaerythritol...
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7429437 |
Diffractive optical element and method of manufacture
A diffractive optical element such as a diffuser, diffraction grating, and/or hologram, can be manufactured by using a surface relief pattern on a surface of a surface relief tool. A layer of...
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7428085 |
Method for producing hologram by pico-second laser
Disclosed is a method of producing a hologram through a two-beam laser interfering exposure process, which comprises emitting a coherent laser light with a pulse width (τ) ranging from greater...
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7416306 |
Laser projector
A reflection-type laser projector ( 100 ) projects modulated laser beams outputted from a laser projection unit ( 40 ), on a screen, wherein a reflector ( 112 ) as a constituent of the screen ( 110...
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7391703 |
Methods for manufacturing volume Bragg grating elements
Methods for recording volume Bragg grating structures having a target wavelength are disclosed. Such a method may include providing a photosensitive recording medium, bringing a first face of the...
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7388695 |
Data storage devices and methods
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...
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7385740 |
Hologram recording medium
There is provided a hologram recording medium having: a recording layer at which a hologram can be recorded by illumination of writing light; and a protective layer provided on the recording layer...
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7384724 |
Method for fabricating optical devices in photonic crystal structures
A method for manufacturing optical components in a three-dimensional photonic crystal lattice. A first resist ( 9 ) is coated on a substrate ( 10 ) and exposed to an e-beam ( 11 ), to produce an...
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7369286 |
Hologram recording medium, and recording apparatus and reproducing apparatus for the same
A hologram recording medium, and a recording apparatus and a reproducing apparatus for the same, by which scattered beam noise is minimized and recording capacity is increased using spatial...
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7362523 |
Method for producing holographic recording medium
A method for producing a holographic recording medium having a holographic recording layer between a first substrate and a second substrate including the steps of: providing a holographic recording...
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7361432 |
Composition for hologram-recording material, hologram-recording medium, and process for producing the same
An object of the present invention is to provide a hologram recording material composition comprising a radical polymerizable compound being solid at an ordinary temperature and having a...
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7345799 |
Optical recording medium and its use
An optical recording medium which comprises a holographic recording layer on which information is recorded by means of holography, a light shield member fixed to at least one of main surfaces of...
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7342697 |
Hologram recording medium
A hologram recording medium includes a hologram recording layer and a transparent substrate layer stacked on the hologram recording layer. The recording layer records an interference pattern of a...
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7339710 |
Holographic recording medium, holographic reading system, and data reading method from the holographic recording medium
A holographic disc recording medium records a hologram over the entire holographic disc recording medium by using a conical reference beam for recording. A hologram recorded image includes recorded...
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7326500 |
Sensitization of photo-thermo-refractive glass to visible radiation by two-step illumination
Photo-thermo-refractive (PTR) glass is a multi-component silicate glass having photosensitivity in rear UV region. A novel process is disclosed for PTR glass sensitization to visible region by...
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7323275 |
Photosensitive composition for volume hologram recording and photosensitive medium for volume hologram recording
A photosensitive composition and A photosensitive medium for volume hologram recording comprises a photopolymerization reactive compound (a monomer) and any one of the following binder: (a) an...
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7312906 |
Switchable polymer-dispersed liquid crystal optical elements
Transmission and reflection type holograms may be formed utilizing a novel polymer-dispersed liquid crystal (PDLC) material and its unique switching characteristics to form optical elements....
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7304774 |
Holographic recording medium
A holographic recording medium 10 includes: a recording layer 12 ; two substrates 14 and 16 sandwiching the same; and a photosensitive protective layer 18 covering these recording layer ...
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7297449 |
Optical recording medium and optical recording apparatus
There is provided an optical recording medium comprising a recording layer containing a charge-generating material capable of generating a first electric charge and a second electric charge by beam...
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7297448 |
Data storage medium comprising colloidal metal and preparation process thereof
Disclosed is a photopolymerizable holographic recording medium for data storage that comprises colloidal metal, and which exhibits a threshold for a second stage polymerization which is...
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7282322 |
Long-term high temperature and humidity stable holographic optical data storage media compositions with exceptional high dynamic range
A novel photoimageable system for a two-chemistry system containing liquid photoreactive asymmetric acrylate compound containing sulfur, aromatic moieties, and optionally bromine, and an aluminum...
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7277208 |
Hologram recording medium, hologram recording and reproduction apparatus and method of producing a hologram recording medium
A hologram recording medium is provided which can prevent sensitization of a region thereof other than a data recording region thereby to prevent deterioration of a characteristic of the hologram...
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7274497 |
Holographic recording medium, method for adding address information to same, and method of addressing
Provided are a holographic recording medium, a method for adding address information to the holographic recording medium, and a method for addressing that can identify two-dimensional information...
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7273683 |
Fiber optic devices having volume bragg grating elements
Fiber optic devices including volume Bragg grating (VBG) elements are disclosed. A fiber optic device may include one or more optical inputs, one or more VBG elements, and one or more optical...
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7271940 |
Deposition of photosensitive media for digital hologram recording
Hologram production devices can include holographic recording material deposition systems to deposit holographic recording material as needed by the hologram production device. Various nozzles, ink...
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7268927 |
Tunable optical filter array and method of use
According to an exemplary embodiment of the present invention, an optical apparatus includes an optical filter array which comprises a plurality of optical filter elements, wherein at least one of...
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7265882 |
Switchable polymer-dispersed liquid crystal optical elements
Transmission and reflection type holograms may be formed utilizing a novel polymer-dispersed liquid crystal (PDLC) material and its unique switching characteristics to form optical elements....
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7256915 |
Switchable polymer-dispersed liquid crystal optical elements
Transmission and reflection type holograms may be formed utilizing a novel polymer-dispersed liquid crystal (PDLC) material and its unique switching characteristics to form optical elements....
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7236277 |
Holographic recording medium and holographic recording method using the same
A holographic recording medium has at least a recording layer with a thickness of L which comprises a recording layer material having an absorption coefficient of α and containing a...
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7229741 |
Exceptional high reflective index photoactive compound for optical applications
A novel liquid photoreactive asymmetric acrylate compound containing sulfur, aromatic moieties, and optionally bromine, and having high dynamic range sensitivity is disclosed. The acrylate compound...
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7206106 |
Holographic ROM reader having servo control
A holographic ROM reader having a servo control is disclosed. The holographic ROM reader includes an objective lens for focusing light reflected from a storage medium, a pinhole plate provided with...
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7206105 |
Hologram recording device and hologram reproduction device
A hologram record apparatus ( 100 ) includes a spatial light modulator ( 15 ) and a control device ( 18 ). The spatial light modulator ( 15 ) is arranged on an optical path of signal light (L 1 )...
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7193879 |
Techniques for multiple frequency chirp readout of material with inhomogeneously broadened absorption spectrum
Techniques for reading the spectral content of a spatial-spectral grating in an inhomogeneously broadened transition (IBT) material include directing multiple probe waveforms to probe a spatial...
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7173744 |
Article comprising holographic medium between substrates having environmental barrier seal and process for preparing same
The present invention relates to an article comprising: a pair of substrates comprising a thermoplastic; a holographic recording medium positioned between the substrates such that the holographic...
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7166409 |
Multipass multiphoton absorption method and apparatus
A method of increasing the efficiency of a multiphoton absorption process and apparatus. The method includes: providing a photoreactive composition; providing a source of sufficient light for...
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7164514 |
Holographic data storage media with structured surfaces
Holographic media for storing and reading holographic data is provided having one or more external or internal surfaces having structures for at least one of minimizing reflections from...
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7158273 |
Holographic data memory
A holographic data storage medium has a polymer film which is set up as a storage layer whose refractive index can be changed locally by heating. The polymer film is set up for the storage of...
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7151623 |
Holographic data-storage medium
In an example holographic data storage medium, which has a polymer film which serves as a storage layer and can be changed locally by heating, the polymer film is set up as a top layer of the data...
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7142337 |
Method for generating a hologram on a disc surface
A method for generating a hologram on a disc surface provides for the use of calibration spots burned onto a disc with an accuracy greater than one half wavelength of light.
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7136206 |
Method and apparatus for implementing a multi-channel tunable filter
The present invention provides a multi-channel tunable filter and methods for making such a filter. In one embodiment, the filter comprises a bank of gratings imprinted into a filter material, such...
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7136205 |
Volume-phase holographic diffraction grating optimized for the ultraviolet spectral region
A volume-phase holographic diffraction grating device is provided that can be optimized for use with very short wavelength light, such as light in the ultraviolet (UV) spectral region. The device...
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7133171 |
Double facing double storage capacity
A first holographic data storage device has a first set of holograms stored thereon. A second holographic data storage device has a second set of holograms stored thereon. An opaque layer is...
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7133170 |
Holographic recording medium
A holographic recording medium according to the present invention includes a holographic material layer in which information is to be recorded by irradiating the same region with information light...
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7129008 |
Holographic recording material
New photosensitive acrylic material compositions for fabrication of holographic recording materials (HRMs) are provided. These compositions are comprised of polymerizable acrylic monomers and light...
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7129007 |
Recording medium for hologram, hologram recording apparatus and hologram recording method
A recording medium ( 1 ) for hologram comprises a hologram recording layer ( 3 ) comprised of photo-polymer layer is formed on a base ( 2 ) comprised of colorless and transparent resin film, etc....
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7129006 |
Optical data storage system and method
An optical storage system and method having separate, independent format hologram writing and data writing mechanisms to allow optimization of data writing separately from format hologram...
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7126730 |
Electro-holographic lens
An electro-holographic lens device comprising: an active layer made from a transparent photo-refractive material, whose refractive index may be locally modified by locally applying an electric...
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