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4815800 |
Flare reduction in holograms
A holographic recording medium is treated to reduce or eliminate unwanted extraneous diffraction and flare. Regions adjacent surfaces of the medium are desensitized to reduce contrast in the...
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4799746 |
Efficient holograms and method for making same
Light sensitive recording medium is exposed to highly absorbed incoherent light either before or after a slant fringe hologram is recorded therein to reduce the sensitivity of the medium at surface...
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4791039 |
Visible ray-recording hologram material
A visible ray-recording hologram material comprising a polymer containing a carbazole ring, iodoform, and an aromatic colorant having a fused ring system. This material enables recording with rays...
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4789211 |
Hologram stabilizing assembly and method
The holograph assembly has first and second hydrophobic substrates layers (14, 12) which carry therebetween a water absorbent layer (16). The holographic image layer (18) is protected against...
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4773718 |
Holograms embossed into metal surfaces
A product whereby diffraction patterns and holograms directly onto surfaces of metal material, such as aluminum. Products include household aluminum foil with embossed holograms, and aluminum...
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4768846 |
Phase conjugate reflecting media
This invention relates to the use of films of poly(acetylene) whether isotropic, of low crystallinity or oriented as a nonlinear phase conjugate reflecting medium. The principle can be applied to...
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4759594 |
Holographic material
Holographic material comprising on a light transparent base at least two silver halide emulsion layers wherein the shrinking factor SF, the ratio of the replay wavelength or the ratio of the...
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4727007 |
Holographic devices employing metallic charge-transfer salts
Metallic salts of organic charge-transfer agents, such as TCNQ, TNAP, TCNE and DDQ and their derivatives, can be processed by an electron beam for a variety of useful electronic and optical...
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4683371 |
Dual stripe optical data card
An optical data card having a pair of spaced apart information strips. One strip has pre-recorded programs or data and is always a non-erasable strip. This strip may be either a reflective...
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4668523 |
Holographic product
Edible holographic elements and methods for making the same are described. Edible holographic elements are used to decorate foodstuffs or can be the ultimate food product.
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4598973 |
Apparatus and method for recording and displaying a three-dimensional image
An apparatus and method for recording and displaying a three-dimensional image is disclosed. A high resolution, thick film emulsion (50) is positioned in contact with a phase-conjugate mirror (60)....
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4560249 |
Method of forming diffraction gratings and optical branching filter elements produced thereby
A method for making a diffraction grating utilizing a laser source, a beam splitter to split the light from the laser source into two light fluxes, a collimator to convert each light flux into a...
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4547141 |
Apparatus for embossing holograms on metalized thermoplastic films
A method and apparatus is disclosed for embossing 2 and 3 dimensional holograms upon the metalized surface of a thermoplastic film.
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4530564 |
Method and apparatus for production of holographic optical elements
System holographic optical element 22 has a substrate 24 and developed grating carrying layer 26 and is for use in an optical system. It is exposed from a coherent point source 50 with the aid of a...
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4509817 |
Method for correcting volume-phase-gelatin holograms Bragg's angle deviation
The Bragg's angle deviation of volume-phase-gelatin holograms is corrected by increasing the water content of the developed hologram and then reducing the water content of the hologram until the...
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4508420 |
Optical system
An optical system comprises a composite block made of a bonded assembly of unit glass blocks, some of which are coated with a thin film on selected surfaces to provide predetermined light...
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4458345 |
Process for optical information storage
Information is stored by a process involving the steps of (1) sensitizing a recording medium comprising a two-photon, four-level material by exposing said medium to flood illumination with...
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4451412 |
Process for producing diffracting phase structures
This invention concerns a process for producing diffracting phase structures in an interaction medium, which is formed of microballs of material in suspension in a polymerizable liquid. When...
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4449785 |
Multiple hologram bulk optical storage device
A multiple bulk optical storage device capable of storing information by the photovoltaic effect is disclosed wherein a thick photosensitive electro-optic material is illuminated by a reference...
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4441945 |
Method for selective lamination of thermoplastic layers
Disclosed is a method and apparatus to facilitate the method of discontinuously laminating at least two thermoplastic layers together. The layers are heated and pressed together over all but a...
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4433893 |
Process for producing holograms
A hologram having excellent durability and high diffraction efficiency and process for producing same is disclosed, wherein a glass hologram is subjected to a surface treatment with hydrofluoric acid.
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4431259 |
Holographic recording media for infrared light
A gated self-developing, non-bleachable holographic material is disclosed which is useful in the infrared region. The holographic material comprises a polymeric matrix with an α-diketone compound...
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4422713 |
Method for making high efficiency holograms
A method for making high diffraction efficiency holograms from dichromated gelatin (DCG) including the steps of curing the DCG for a specified time under controlled temperature and humidity...
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4421317 |
Electronic game apparatus using a three-dimensional image
An electronic game includes a base having an opening; at least one three-dimensional image stored on a plate, typically a hologram; a light source for each image; a microcomputer; and player...
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4378141 |
Exposure package for holography
An exposure package for holography. A transparent substrate carries a photographic emulsion layer on both surfaces thereof. After exposure the emulsion layers are developed while remaining on the...
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4374189 |
Process of making a holographic optical article
A holographic optical article of manufacture and a process for making it made from a polymeric material in the form of film which is transparent in the infrared region and which is photochemically...
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4367911 |
Method and assembly for holographic exposure
Assembly 10 is formed of base and cover plates 12 and the 16 with dichromated gelatin holographic exposure layer 20 therebetween. Liquid monomer is placed in the assembly and is polymerized to...
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4343874 |
Method of constructing a hologram on a photoresist detector
A photoresist holographic technique in which the object modified and reference beam are of substantially the same average intensity, the photoresist is exposed for a long period of time and...
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4339513 |
Process and recording media for continuous wave four-level, two-photon holography
A process and recording medium for four-level, two-photon holography are provided. These media are particularly useful for recording holograms using continuous wave lasers. The recording medium is...
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4330604 |
Fabrication of holograms on plastic substrates
An improved process is provided for attaching layers of hydrophilic, photosensitive materials onto hydrophobic plastic substrates, which comprises forming a layer of a polycrystalline, optically...
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4329409 |
Process for fabricating stable holograms
An improved method for fabricating a light weight dichromated gelatin hologram package on plastic or glass substrates is provided. The prior art cover plate protecting the gelatin layer is...
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4315665 |
Composite optical element having controllable light transmission and reflection characteristics
A three layer composite optical structure wherein a first layer is a substrate having surface variations holographically formed therein that contain phase information of a light pattern or object...
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4305666 |
Optical heterodyne detection system and method
A system to achieve heterodyne detection of optical (i.e., infrared, visible and ultraviolet) signal wavefront is disclosed. The system employs a holographic phase grating that, when illuminated by...
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4287277 |
Hologram recording material
A hologram is produced by causing a crosslinking reaction in accordance with an interference pattern in a recording carrier composed of a polymer containing in its unit structure an aromatic or...
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4269473 |
Identification card with a hologram and a process for the production thereof
An identification card, which has an increased safeguard against counterfeiting, comprises both a hologram containing information and information which is visible recorded in a single layer of...
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4258111 |
Hologram and method of production thereof with photo-crosslinkable polymers
A hologram is produced by causing a crosslinking reaction in accordance with an interference pattern in a recording carrier composed of a polymer containing in its unit structure an aromatic or...
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4254193 |
Hologram and method of production thereof from polysaccharide recording layer
A hologram is produced by forming an interference pattern in a recording carrier composed of a polysaccharide made active to radiation in the presence of a compound containing a metal ion.
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4244633 |
Multicolor hologram and method for forming same
A hologram capable of reconstructing a multicolor three-dimensional image is formed in which a plurality of standing wave interference fringe patterns corresponding to primary color components of a...
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4235504 |
Holographic disk scanner
A light scanning apparatus comprises a disk having a plurality of holograms, and a laser beam source for radiating and directing a laser beam (which functions as a reproduction wave) onto the...
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4220928 |
Adaptive correction of linear phase aberrations in laser amplifier systems
Linear phase aberrations in laser amplifier systems are adaptively corrected by a device which propagates an object beam formed by reflection of a laser beam from a target backwards through a laser...
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4217405 |
Production of volume dielectric holograms
Volume dielectric holograms are prepared by methods which have in common the intra-emulsion diffusion transfer of silver atoms within the emulsion by a process of dissolving undeveloped silver...
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4201441 |
Hologram and method of production thereof
Holograms are produced by exposing a film-like sensitive member composed of polyvinylcarbazole or its derivatives containing an iodine compound to an interference pattern of laser, swelling the...
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4187109 |
Strontium barium niobate single crystal doped with Ce
An optical element is composed of a single crystal of strontium barium niobate doped with a transition metal element such as cerium, vanadium or uranium. This element has the property of undergoing...
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4179182 |
Holographic jewel
A jewel and method of making same, the jewel being a unique hologram and lens combination. A reflection hologram of an object is first made and the psuedoscopic image is then used in recording a...
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4173474 |
Hologram and method of production using two solvent treatments
A hologram comprises a polymer carrier and a portion composed of a polymerization product of a photopolymerizable monomer contained in the polymer carrier, and the polymerization product is...
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4171864 |
Identification document and display unit therefor
An identification document contains idential data both in visual and holographic form. Simultaneous display of the visual data and holographic data in closely adjacent relationship permits ready...
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4139388 |
Holographic recording medium containing a 2-cyanoacrylate polymer
A photosensitive recording medium for recording spatially modulated optical data and for the recording of holographic information in real time, comprising a polymeric sheet containing a...
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4136347 |
Method for making a holographic tone wheel for use in a sync-off-tach tape drive system
A holographic recording is made on a tone wheel which is arranged to be driven by a capstan motor and capstan assembly. The holographic recording is a series of radial holograms on the tone wheel...
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4126373 |
Holographic identification elements and method and apparatus for manufacture thereof
An identification element having an integral holographic recording as part thereof and method and apparatus for manufacture. The identification element is formed using an interference pattern from...
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4125760 |
Relief pattern impressing apparatus
An apparatus for impressing relief patterns of high resolution, particularly phased holograms or phased diffraction gratings, in a thermoplastic information carrier, comprises a heatable impressing...
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