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7202984 |
Double faced double storage capacity medium
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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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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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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7112359 |
Method and apparatus for multilayer optical articles
The present invention provides a method and apparatus for a multilayer optical articles. A method comprises forming a first multilayer article with a first substrate and a second substrate with a...
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6998197 |
Device for registration of optical holograms on the amorphous molecular semiconductor films
This invention relates to the field of holography, in particular to a method and a device for recording optical holograms by means of amorphous molecular semiconductor (AMS) films deposited on a...
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6998195 |
Device for registration of optical holograms on the amorphous molecular semiconductor films
This invention relates to the field of holography, in particular to a method and a device for recording optical holograms by means of amorphous molecular semiconductor (AMS) films deposited on a...
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6611612 |
Security reader for automatic detection of tampering and alteration
A document ( 10 ) is covered by a laminate ( 13 ) comprising a layer of microspheres ( 16 ) over an adhesive layer ( 14 ) covering a source image ( 12 ) such as a photograph, printed matter, or a...
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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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6473208 |
Two-color holographic recording apparatus
A two-color holographic recording apparatus reduces error signals possibly included in reproduced digital data signals. The two-color holographic recording apparatus has first, second and third...
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6366278 |
Camera system
A picture recording device includes at least one photodetector for each picture element to be recorded before which one focusing element is arranged for forming an image of each element of the...
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6363097 |
Semiconductor laser with a rewritable wavelength stabilizer
A semiconductor laser with a rewritable wavelength stabilizer which comprises a laser mirror made of a grating written into a photorefractive material, in which the oscillation wavelength of the...
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6156415 |
Method for fabricating a multilayer optical article and a system having a multilayer optical article
A method for fabricating an article, comprising the steps of grasping an outer surface of a first substrate with a first holder, whereby the outer surface of the first substrate is held to an inner...
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5920409 |
Optoelectronic devices using persistent photoconductivity
A compound semiconductor that is suitably doped to exhibit the DX effect is irradiated with an optical beam of spatially varying intensity whereby localized regions of persistently higher...
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5903648 |
Method and apparatus for encryption
A method and apparatus of encrypting optical images and storing these images in memory using random phase encoding is presented. The encryption technique uses random phase encoding in both the...
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5569565 |
Hologram recording material
A hologram recording device, which comprises a recording layer of a polymer composition a photoconductive element, a second-order super-polarization element and an electron or hole capturing...
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5539542 |
Photorefractive device having an electro-optical material between two photoconductive materials
A photorefractive apparatus is exposed to a write beam or radiation for creating a system of interference fringes in the apparatus, as well as to a read beam or radiation which diffracts the system...
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5497254 |
Optical apparatus including a liquid crystal modulator
An optical apparatus for controlling a wave front of a coherent light including at least a coherent light source, an electrically addressable liquid crystal device having a plurality of pixels...
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5258860 |
Optical phase adder
A photosensitive element 46 absorbs at least a portion of an incident write beam 40, causing a spatially varying electric field to be applied across a layer of a ferroelectric liquid crystal (FLC)...
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5132811 |
Holographic operating optical apparatus
A holographic apparatus has an inferometer for concurrently irradiating an image recording medium by a writing reference light of spherical or plane wave form and a signal light containing image...
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5049963 |
Holographic television apparatus with semiconductor device
A holographic television apparatus is disclosed for detecting and displaying three-dimensional holographic information corresponding to a holographic optical interference pattern. The apparatus...
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4831244 |
Optical record cards
Various configurations of rectangular optical information storage card include an information surface arranged in a generally concentric and/or spiral format so that the information surface can be...
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4542955 |
Device for illuminating an electro-optical medium for recording holograms in real time
The invention relates to electro-optical media which make it possible to record holograms in real time. It consists in using a lamina of a selected material such as bismuth-silicon oxide, this...
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4304458 |
Arrangement for displaying deformations of deformable structures by holographic interferometry
The arrangement for displaying deformations of deformable structures by holographic interferometry, in which the interferogramme of the object is obtained by double exposure for an object subjected...
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4252400 |
Nondestructive dynamic controller for thermoplastic development
A nondestructive dynamic controller for thermoplastic development is disclosed. The dynamic controller monitors the development of a hologram, without altering the charge pattern on the recording...
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4174881 |
Recording a synthetic focused-image hologram on a thermally deformable plastic
A synthetic focused image hologram of a white light image is recorded as variations in the depths of grooves of a diffraction grating in a layer of thermoplastic material located on a layer of...
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4124268 |
Optical device for the storage and the selective erasure of information
The object of the invention is to provide a device for storing and selectively erasing information in electrooptical photoconductive materials in which selective recording and erasure are obtained...
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4014603 |
Method of holographic recording
Disclosed are a method and apparatus for holographically recording a plurality of holograms on a recording material. The method comprises producing two coherent light beams, altering one of these...
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3997238 |
Holographic recording process using a thermoplastic photosensitive member
A holographic recording process uses a thermoplastic photosensitive member in which charging on the member and exposing the same to light having holographic information are carried out...
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3976354 |
Holographic memory with moving memory medium
In a holographic memory or a holographic recording system, one dimensional Fourier transform holograms are recorded on a moving memory medium. The one dimensional Fourier transform holograms have...
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3972716 |
Color electrophotography using encoded multicolor information
A system for electrostatic photography using a camera having an aperture formed in one side for imaging light onto a photoconductive insulating layer positioned and supported in the camera housing...
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3851948 |
HOLOGRAPHIC THERMOPLASTIC MEMORY SYSTEM
A holographic memory system includes a transparent thermoplastic recording medium having a large area for the storage of a large number of individual holograms, a photoconductive layer, and at...
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3838403 |
STACKED PHOTOPLASTIC DATA STORAGE SYSTEM
An electro-optical data storage system and method of operation thereof comprising the means and steps, respectively, for selectively recording and reading data stored in any of a plurality of...
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3825317 |
APPLICATION OF A NOVEL PHOTOSENSITIVE MEMBER TO HOLOGRAM
A hologram comprises an interference pattern composed of a mutual diffusion portion of a photoconductor and a metal formed at an exposed portion of a photosensitive member, the photosensitive...
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3680060 |
ELECTRO-OPTICAL MEMORY EMPLOYING FERROELECTRIC ELEMENT
A photoconductive-ferroelectric device is employed as an erasable storage medium for recording and reading light patterns. The ferroelectric material may be a bismuth titanate crystal and its...
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3660818 |
ELECTRO-OPTICAL MEMORY
Information is optically written onto the electrically charged surface of a transparent storage medium by directing light modulated with this information at this surface. The light partially...
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3655257 |
APPARATUS FOR FORMING A PHASE HOLOGRAM ON A DEFORMABLE THERMOPLASTIC
Method and apparatus for producing holographic interference patterns wherein a modulated coherent object beam and off axis reference beam cooperate to discharge a photoconductive thermoplastic...
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3623787 |
HOLOGRAPHIC SYSTEM
The specification describes a holographic recording system employing, as the recording medium, a photoconductive semiconductor.
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3491343 |
APPARATUS FOR METHODS OF CONVERTING HOLOGRAPHIC RADIANT ENERGY PATTERNS INTO VIBRATORY WAVES
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3821722 |
Title is not available
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