Matches 101 - 150 out of 235 < 1 2 3 4 5 >
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5930012 Polarization independent optical switch  
A polarisation independent optical switch is constituted by a light input (6), a diffractive and re-configurable liquid crystal device (8), a collimating lens (7) for distributing the input light...
5920536 Method and apparatus for holographic data storage system  
Feedback is employed in a holographic memory system to facilitate rapid access to information in a stored data page. This feedback technique provides compensation for thermal, optical and/or...
5892597 Holographic recording apparatus and holographic optical element  
A holographic recording apparatus includes first and second light sources for respectively generating first and second light beams. A mask is located in front of a hologram recording material and...
5887090 Optical network  
An optical interconnection network in which more than one communication can ccur at any give time is disclosed. The interconnection network can form part of a parallel computer, a fiber optic...
5877874 Device for concentrating optical radiation  
A holographic planar concentrator (HPC) for collecting and concentrating optical radiation is provided. The holographic planar concentrator comprises a planar highly transparent plate and at least...
5877873 Differential video image compression in holographic media  
A video image F k! is identified as a basis image and stored as a basis page S k! in a holographic storage medium. A subsequent image F k+n! is stored by recording in the medium a page S k+n!=F...
5859713 Imaging in a scattering medium using photon density waves  
Image derogating optical noise due to light scattering of an object under examination, embedded in a light scattering medium, is substantially reduced by passing a modulated signal laser beam...
5838650 Image quality compensation method and apparatus for holographic data storage system  
Feedback is employed in a holographic memory system to facilitate rapid access to information in a stored data page. This feedback technique provides compensation for thermal, optical and/or...
5835246 Addressable imaging  
A means, method and apparatus for producing a parallel addressable set of images by modulating a set of input beams with addressing information, and projecting the energy from a three-dimensional...
5825514 Master hologram for the production of copy-proof holograms  
A method for the production of holograms proof against copying and imitation possessing authenticity features, which are copies of a master hologram. In accordance with the invention as a master...
5822092 System for making a hologram of an image by manipulating object beam characteristics to reflect image data  
A system for converting an image into a hologram formed from diffraction gratings includes obtaining image data for each pixel in an image to be converted, putting it into digital form and using...
5822091 Extreme depth-of-field optical lens and holographic projector system for its production  
A modulated index lens containing a subsurface zeroth order coherent microlenticular mosaic defined by an index gradient adds a normalizing function to the vergences or parallactic angles of...
5812318 Apparatus and methods for routing of optical beams via time-domain spatial-spectral filtering  
Apparatus and methods are disclosed for spatially routing an optical pulse (data pulse) of an electromagnetic radiation and containing a specific address temporal profile and possibly additional...
5805316 Twin-image elimination apparatus and method  
The twin-image elimination apparatus of the present invention comprises (a) a scanning light source for emitting a scanning light beam; (b) an interference device which converts the scanning light...
5793504 Hybrid angular/spatial holographic multiplexer  
A plurality of holograms are simultaneously angularly and spatially multiplexed within a storage medium by writing the holograms at different locations within the storage medium using reference and...
5754318 Apparatus for parallel recording of holograms in a dynamic volume medium  
Apparatus for the simultaneous parallel recording of holograms on a dynamic volume medium. Directed along a recording axis is a polychromatic source image which has multiple component images to be...
5721630 High-efficiency reflective holographic diffuser and method for making thereof  
A high-efficiency holographic diffuser is provided, the holographic diffuser being comparatively thin, yet characterized by good optical density along a broad bandwidth. In particular, the...
5703702 Holographic synthesis  
A tight packed array of amplitude controlled in-phase light emitters produces dynamic real holographic images. A partially reflecting mirror is applied to a planar array of amplitude controlled...
5696613 Method and apparatus for multiplexing data in different planes of incidence of a thin holographic storage media  
A holographic data storage system includes a laser (12) for generating both data and reference beams. The reference beam is deflected by an optic system such that the reference beam can be directed...
5689351 Holographic memory readout with reduced speckle  
A method and apparatus are provided for reducing speckle noise in images read out from holographic memories. An image recorded in the memory is read out using a multiple component readout beam,...
5687012 Hologram in which a plurality of areas are set and holography system to which hologram is applied  
A hologram is formed using a grating and a second hologram serving as an image hologram. The grating is constituted by a plurality of areas whose spatial frequencies and diffraction directions are...
5684611 Photorefractive systems and methods  
A new type of holographic recording in photorefractive crystals is disclosed, termed orthogonal data storage, in which counterpropagating, reflection mode holograms are wavelength multiplexed to...
5684588 Homodyne and hetrodyne imaging in a light scattering medium  
Image derogating optical noise due to light scattering of an object under amination, embedded in, or positioned in front of a light scattering medium, is substantially reduced by employing a...
5671073 Holographic storage using shift multiplexing  
The invention is embodied in a method of recording successive holograms in a recording medium, using at least a fan of M waves along at least a first axis with a separation angle between adjacent...
5642210 Method for mitigating cross-talk in high-efficiency holograms  
In a method for mitigating cross-talk in high-efficiency, angle-multiplexed holograms stored in photorefractive media, a plurality of uniformly low-efficiency holograms are first stored within a...
5642209 Directional light filter and holographic projector system for its production  
A photosensitive optical body is exposed by a diverging three-dimensional standing wave interference pattern generated by a holographic projector system. The projector system, using binary optics,...
5640255 Holographic authentication patch  
A method is disclosed to holographically mark an object in a way that the mark cannot be removed, reproduced, or transferred covertly. The mark can be read from a distance so that the part can be...
5638193 Method and apparatus for azimuthal multiplexing of holograms  
A holographic storage system and method are provided in which a light source (12) is used to generate a coherent light beam which is split into a reference beam (18) and an object beam (20). The...
5627664 Holographic storage with combined orthogonal phase codes and random phase codes  
A method and apparatus for holographic storage with combined orthogonal phase codes and random phase codes are provided in which a reference beam (18) is encoded with a combination orthogonal phase...
5612812 Method and apparatus for photorefractive pirouette display and processing of analog signals  
A photorefractive pirouette display device can produce the sonogram of speech sounds by incorporating the short-time Fourier spectrum of speech waves as the input. The device requires a coherent...
5589955 Optical device and optical machining system using the optical device  
The invention provides an optical device with high light utilization efficiency that is capable of scribing patterns on curved surfaces, as well as flat surfaces, using a liquid crystal spatial...
5557431 Real-time compensated imaging system and method using a double-pumped phase-conjugate mirror  
An adaptive optics imaging system uses a double pumped phase conjugate mirror (DPCM) to compensate for phase, amplitude or polarization aberrations imposed upon a multi-pixel object beam. A remote...
5555128 Phase coding technique for one-way image transmission through an aberrating medium  
An object beam is passed through an aberrating medium to produce a diffraction distorted image therein, which is imaged upon a spatial light modulator. A probe beam measures the phase aberrated...
5548419 Stereo multiplexed holographic particle image velocimeter  
A holographic particle image velocimeter employs stereoscopic recording of particle images, taken from two different perspectives and at two distinct points in time for each perspective, on a...
5548418 Holographic structured light generator  
The present invention is a holographic structured light generator (HSLG) for generating an array of an arbitrary number of laser beamlets from a single laser beam using a point laser light source...
5546200 Chromatic light separator and picture projector using a chromatic light separator  
This invention concerns chromatic light separators, and is particularly intended to reduce their dimensions. A chromatic separator in accordance with the invention contains at least two selective...
5543251 Method of recording plural holographic images into a holographic recording material by temporal interleaving  
Holographic images are constructed in a recording material in accordance with a temporal interleaving technique in which a first set of images is constructed for a predetermined first imaging time...
5535024 Photorefractive holographic interference novelty filter  
A novelty filter utilizes self-nulling and self-aligning of reflection and transmission phase conjugate beams. A photorefractive crystal is arranged so that the contributions to the phase conjugate...
5529861 Method for enhancing the utility of a photopolymer recording media for holographic data recording  
A holographic storage media (10) is fabricated from a thin layer of photopolymer recording media. The photopolymer recording media is disposed between a substrate (48) and a capping layer (56). The...
5513022 Method and apparatus for direct transmission of an optical image  
A method and apparatus using a holographic storage medium for direct transmission of an optical image which can compensate for distortions occurring during transmission of the image. An apparatus...
5502581 Hologram manufacturing method and apparatus  
A hologram manufacturing apparatus and a hologram manufacturing method for manufacturing a hologram optical device by a split exposure method are disclosed. The manufacturing apparatus comprises...
5499116 Encoded hologram for producing a machine readable image and a human readable image  
An encoded hologram that produces a first image and a second image pursuant to playback illumination, wherein the first image is resolvable by human vision while the second image is not resolvable...
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...
5483365 Method for holographic storage using peristrophic multiplexing  
A peristrophic multiplexing system directs a signal light beam and reference light beam onto a selected recording spot in the recording medium. The light beams collectively define a plane of...
5455691 Method of making a hologram  
This specification discloses a method of making a hologram imaged substantially without aberrations during the use when the wavelength of a light during the making differs from the wavelength of a...
5450218 Method for encoding and decoding digital data in holographic storage media  
A method for encoding and decoding digital data for storage in a holographic medium (12). Digital data, consisting of binary data (B i ) or grey scale data (A i ), is encoded in bit groups or digit...
5438439 Non-destructive readout mechanism for volume holograms using two wavelengths  
Multiple volume holograms are recorded by changing the incidence angle of the reference beam at one wavelength. The stored holograms are reconstructed at another wavelength by using the reference...
5422873 Multiplexing and selective updatable fixing and erasing of volume holograms in photorefractive media and second harmonic generation in photorefractive media by optically induced periodic poling  
New methods are presented for multiplexing volume holograms in electrooptic materials. Multiple volume holograms can be superimposed in a medium and be individually addressed by tuning the...
5416616 Incoherent/coherent readout of double angularly multiplexed volume holographic optical elements  
Novel apparatuses for readout of multiplexed volume holographic optical elements, based on parallel incoherent/coherent double angularly multiplexed holographic recording and readout principles,...
5388173 Method and apparatus for forming aperiodic gratings in optical fibers  
A method and apparatus for simultaneously exposing an optical fiber 32, made of a material which has a refractive index that can be permanently changed by exposure to light of a predetermined...
Matches 101 - 150 out of 235 < 1 2 3 4 5 >