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6961159 |
Holographic viewing device, and computer-generated hologram for the same
The invention relates to a holographic viewing device that enables a given pattern to be properly viewed in place of light sources in a scene and is easy to fabricate and assemble with consistent...
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6954293 |
Data carrier having an optically variable element and methods for producing it
The invention relates to a system comprising a series of data carriers, in particular identity cards, papers of value or the like, whereby the data carriers belonging to the system exhibit...
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6939648 |
Optical article and process for forming article
The optical article of the invention, e.g., holographic recording medium or polymeric waveguide, is formed by mixing a matrix precursor and a photoactive monomer, and curing the mixture to form the...
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6914703 |
Holographic recording material composition
A holographic recording material composition used for storing optical information as a spatial variation of refractive index, having: (a) a compound having at least one polymerizable functional...
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6912073 |
Optical filter array and method of use
In accordance with an exemplary embodiment of the present invention, an optical apparatus includes a glass monolithic structure including a plurality of optical filter elements, and the glass...
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6909528 |
Phase volume hologram and method for producing the phase volume hologram
A phase volume hologram and a method for producing the phase volume hologram are described herein. The phase volume hologram is made by filling the microcavities of a porous transparent siliceous...
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6906835 |
Doped stoichiometric lithium niobate crystals and method for high-speed holographic data storage
The present invention discloses a recording medium comprising an improved doped Stoichiometric Lithium Niobate (SLN) crystal for high-speed holographic data storage. The improved doped SLN has an...
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6894978 |
Method and system for operation of a resilient closed communication network without a dedicated protection network segment
A method and system for operation of a resilient closed communication network without a dedicated protection network segment. The method uses a resilient closed communication network with at least...
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6870649 |
Holographic viewing device, and computer-generated hologram for the same
The invention relates to a holographic viewing device that enables a bright reconstructed pattern to be viewed in place of light sources in a scene while a spot due to zero-order transmitted light...
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6864019 |
Recording material formulations for holographic media
Holographic data storage media having a sandwiched construction are described in which a holographic recording material is sandwiched between two substrates. A variety of different formulations of...
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6862120 |
Hologram recording medium, hologram recording method and hologram recording and reproducing apparatus
In a hologram recording method for forming a plurality of areas of a refractive index light interference pattern of a coherent signal light beam in accordance with information data within a...
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6856433 |
Holographic recording medium and holographic recording/reproducing apparatus using the same
A holographic recording medium exhibiting a high recording sensitivity without execution of reduction treatment. A system records information on the holographic recording medium by using a gating...
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6850345 |
Sandwich holographic disk construction with thin molded substrates
In one embodiment, holographic data storage medium includes a first thermoplastic substrate portion having a thickness less than approximately 2 millimeters and a second thermoplastic substrate...
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6850346 |
Method and apparatus for storing and retrieving a sequence of digital page data
In a storing mode of an apparatus for storing and retrieving a sequence of digital page data, a first/second complex reference beam and a modulated signal beam converge on a storing location to...
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6844946 |
Tunable holographic filter
An optical add/drop filter is formed using a hologram which is tuned to a wavelength in an optical signal. The diffraction condition of the hologram may be varied to vary the in add or drop content.
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6844949 |
Method and apparatus for storing and retrieving digital page data
In a storing mode of an apparatus for sequentially storing and retrieving digital page data, a first and second complex reference beams and a modulated and second signal beams converge on a...
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6825960 |
System and method for bitwise readout holographic ROM
According to one aspect a method for manufacturing a holographic storage medium includes providing one or more data masks with data to be recorded, illuminating the one or more data masks onto the...
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6805934 |
Volume hologram laminate
The present invention relates to a volume hologram laminate with low generation of spotty hologram flaws in the volume hologram layer even when kept under pressurized conditions during storage, and...
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6804034 |
Fluid containment substrates for holographic media
Holographic data storage media having a sandwiched construction are described in which a holographic recording material is sandwiched between two substrates. The substrates may be formed with fluid...
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6780546 |
Blue-sensitized holographic media
Blue-sensitized holographic media suitable for recording with a blue laser is disclosed. The blue-sensitized holographic media provides greater dynamic range and a higher sensitivity than a...
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6775036 |
Holographic shrink wrap element and method for manufacture thereof
A holographic shrink wrap element containing a shrink wrap film and a layer on the shrink wrap film, wherein the layer contains a holographic image. A process for preparing a holographic shrink...
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6765061 |
Environmentally durable, self-sealing optical articles
Holographic articles having self-sealing properties such as moisture resistance and environmental durability are disclosed. The holographic articles are formed by the reaction of a composition...
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6761999 |
Nondegenerate four-wave mixing using photoinduced charge-transfer materials
Charge-transfer materials are demonstrated to be useful for generating femtosecond holographic gratings. Using semiconducting polymers sensitized with varying concentrations of C 60 , absorption...
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6756157 |
Volume hologram laminate and label for preparation of volume hologram laminate
The present invention provides a volume hologram laminate by which a desirable reproduced wavelength is controlled and set optionally. The laminate has a first adhesive layer 3 , a volume hologram...
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6747768 |
Information carrier with a hologram
An information carrier includes information in the form of a hologram. In order to increase protection against copying and/or as a simple recognizable additional security feature of this...
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6743552 |
Process and composition for rapid mass production of holographic recording article
A rapid mass production of the high performance holographic recording articles including the process and composition are described. To prepare a high performance holographic recording article based...
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6730442 |
System and method for replicating volume holograms
The present invention offers increased efficiency and quality in the duplication of a master hologram utilizing an improved method of contact printing. This improved method of contact printing...
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6710901 |
Method and apparatus for two-photon, volumetric spatially resolved holographic data storage in photosensitive glass
A method for the generation of volume spatially-resolved holographic data storage within a photosensitive glass sample that incurs changes of optical properties in response to two-photon...
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6709790 |
Method and apparatus for generating periodic structures in substrates by synthetic wavelength holograph exposure
A substrate surface 10 having a photo-sensitive material surface thereon is simultaneously exposed to four plane waves of light at angles of incidence θ, −θ, φ and −φ subtending from the...
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6710900 |
Holograms exposed and processed on plastic substrates
A holographic recording material coupled to a plastic substrate can be exposed to an interference pattern formed by at least one coherent light source, and subsequently processed, thereby...
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6697178 |
Disk with holographic security label applied thereto and method of applying label
An optical disk has a holographic security label applied in a recessed portion of the disk. An associated method of applying a holographic label to a recessed portion of an optical disk is also...
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6689316 |
Holographic sensors and their production
A method for the production of a holographic sensor wherein the holographic recording material forming the sensitive element is a polymer matrix, which comprises diffusing into the matrix one or...
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6686097 |
Reversible hologram fixation in photorefractive materials using incoherent ultraviolet light
A holographic information storage and retrieval system provides an all-optical reversible method to fix information in doped or undoped photorefractive materials. The fixed information is...
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6673497 |
High efficiency volume diffractive elements in photo-thermo-refractive glass
Novel volume holographic elements were made from Bragg diffractive gratings in photo-thermo-refractive (PTR) glass with absolute diffraction efficiency ranging from greater than approximately 50%...
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6671073 |
Environmentally protected holographic device construction
A holographic optical data storage device according to the present invention includes a photopolymer layer having an upper surface and an oppositely disposed lower surface. The device includes a...
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6670079 |
Photorefractive material
A photorefractive material provides a high photosensitivity without reduction. The material comprises a single crystal of terbium (Tb)-doped niobate or tantalate. The single crystal is a single...
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6650447 |
Holographic storage medium having enhanced temperature operating range and method of manufacturing the same
A holographic storage medium, a method of manufacturing the holographic storage medium and a holographic storage device incorporating the storage medium. In one embodiment, the holographic storage...
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6627354 |
Photorecording medium, process for fabricating medium, and process for holography using medium
A photorecording medium contains a polymeric matrix, typically cross-linked to provide a desired level of physical stability, and a photoimageable system containing a photoactive monomer. Unlike...
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6624915 |
Holographic recording and micro/nanofabrication via ultrafast holographic two-photon induced photopolymerization (H-TPIP)
A process and photoactive media for holographic recording and micro/nanofabrication of optical and bio-optical structures via the simultaneous absorption of two-photons by the photoactive media to...
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6611365 |
Thermoplastic substrates for holographic data storage media
In one embodiment, holographic data storage medium includes a first thermoplastic substrate portion having a thickness less than approximately 2 millimeters and a second thermoplastic substrate...
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6586141 |
Process for production of high efficiency volume diffractive elements in photo-thermo-refractive glass
A novel process is proposed for the volume diffractive element (Bragg grating) fabrication in photosensitive silicate glasses doped with silver, cerium, fluorine, and bromine. The process employs a...
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6587234 |
Method and apparatus for creating a white-light interference hologram from PC input photographic data
A system for producing a white-light interference hologram includes a camera adapted for recording a first and a second bitmap image of a scene from separate vantage points, and the separation...
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6569600 |
Optical recording material
An optical recording material which when exposed to actinic radiation produces a change in optical properties in the exposed regions, thereby providing a pattern of intelligence for storing and...
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6558851 |
Optical medium for registration of holographic interferograms
This invention relates to the photo-sensitive thermoplastic top-layer of optical media for registration of holograms, where the media consists of three transparent layers where the bottom layer is...
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6549664 |
Sparse modulation codes for holographic data storage
A method for storing data in a holographic storage medium comprises the steps of dividing a bit stream of binary data into data groups, encoding the data groups as binary patterns, and storing the...
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6542264 |
Electro-holographic optical switch
The present invention relates to an optical switch comprising a paraelectric photorefractive material, storing a hologram, possibly a latent hologram, whose reconstruction, or activation and...
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6538775 |
Holographically-formed polymer dispersed liquid crystals with multiple gratings
A multicolored reflection liquid crystal display device includes a pair of substrates having a reflective holographic polymer dispersed liquid crystal (H-PDLC) film disposed therebetween. The...
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6535276 |
Method for measuring the velocity of particles in a fluid medium in motion
A method measures the three dimensional position of particles in a fluid medium contained in a sample by recording a digital hologram of the particles on an image sensor and by reconstructing the...
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6524771 |
Optical recording film and process for production thereof
There are disclosed the following three types of optical recording film: (1) an optical recording film comprising a gel having a network structure of an inorganic substance and a polymer which is...
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6512606 |
Optical storage media and method for optical data storage via local changes in reflectivity of a format grating
An optical data storage system and method comprising a photopolymer medium having generally a polymerizable monomer, an active binder, a first, hologram recording polymerization initiator, and a...
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