Matches 101 - 150 out of 173 < 1 2 3 4 >
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5170268 Polarization-independent energy exchange and phase conjugation  
A polarization independent energy exchanger transfers optical energy from a first coherent beam of optical energy to a second coherent beam of optical energy where the second beam is coherent with...
5150229 Optical correlator  
An optical correlator according to the present invention generates a cross-correlation peak of two patterns of pictorial information to be compared. It generates pictorial patterns of a sum of the...
5150228 Real-time edge-enhanced optical correlator  
Edge enhancement of an input image by four-wave mixing a first write beam with a second write beam in a photorefractive crystal, e.g., GaAs, achieved for VanderLugt optical correlation with an edge...
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...
5126862 Image transmission through thick aberrators  
A method is provided for reconstructing an image transmitted through a thick distorting medium. A remote source provides coherent light at the object plane, and a local source, typically derived...
5121231 Incoherent/coherent multiplexed holographic recording for photonic interconnections and holographic optical elements  
The present invention relates to a novel architecture and associated apparatus for the development of highly multiplexed photonic interconnection networks and holographic optical elements with...
5121228 Holographic learning machine  
A holographic learning machine comprising a volume holographic recording medium, 2N photo-detectors receiving light diffracted from the medium, and N electrical circuits subtracting respective...
5119214 Method for forming a computer generated hologram  
New methods for producing computer generated holograms to be used for a liquid crystal spacial light modulator having a plurality of pixels, wherein the amplitude component of a coherent wave...
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...
5039182 Storing information in dual holographic images  
A holographic storage system receives light having its linear polarization rotated from a reference linear polarization for carrying given information. The modulated light is stored as two distinct...
5018801 Achromatic volume holography apparatus  
Achromatic volume holograms are attained for broad band phase conjugation and image reconstruction having bandwidths of 250 nanometers. The holograms are generated by means of a diffraction grating...
5005927 Nonlinear optical microscope  
A microscope that preferentially displays either moving or stationary objects. This all-optical device operates in real-time using the coupling of optical beams in suitable nonlinear medium such as...
4971409 Real-time optical image subtraction  
An apparatus for subtracting the amplitude of a first optical image on a first beam from the amplitude of a second optical image on a second beam includes a first beam splitter to divide the first...
4968107 Real time image inversion using four-wave mixing  
An intensity inverter includes an optically nonlinear medium and a reference beam having a uniform transverse intensity distribution and having the same wavelength as the signal beam. The reference...
4953924 Enhanced nondestructive holographic reconstruction  
A method for promoting enhanced nondestructive reconstruction of holograms recorded in photorefractive media involves control of the polarization states of the reconstruction beam and the recording...
4948212 Optical processing in III-V and II-VI compound semiconductors  
Optical processing using photorefractive GaAs and other compound semiconductor crystals (28) is achieved in a four-wave mixing configuration. Potential applications of optical processing include...
4929081 System for detecting defects in a regularly arranged pattern such as an integrated circuit or the like  
A pattern defect detecting system for an integrated semiconductor circuit or the like, utilizing the phenomenon that in the case of a test pattern having regularity, the intensity of diffracted...
4927220 System and method for photorefractive holographic recording and signal processing  
A photorefractive crystallyte array for image recording and signal processing is disclosed. The photorefractive crystallytes are configured as a two-dimensional array of selected position and...
4921333 Phase contrast image microscopy using optical phase conjugation in a hybrid analog/digital design  
A method for producing an intensity contrast image from phase detail in a transparent phase object also removes spurious background artifacts and speckle from the light source resulting in clearer...
4913534 Real-time dynamic holographic image storage device  
A real-time dynamic holographic image storage device uses four-wave mixing in a pair of photorefractive crystals. An oscillation is produced between the crystals which can be maintained...
4898436 Spatial light modulation in compound semiconductor materials  
Spatial light modulation (22) in a III-V single crystal (12), e.g., gallium arsenide, is achieved using the photorefractive effect. Polarization rotation created by beam coupling is utilized in one...
4836658 Optical devices for forming image and reference beams with a polarizing beamsplitter and a spatial light modulator  
An optical device for use in forming a holographic record, comprising a polarizing beam splitter and a spatial light modulator arranged to derive from an incident beam a focussed image beam and a...
4810868 Frasable optical wallet-size data card  
A data card having an optical recording medium formed by an erasable layer atop a polymer layer with prerecorded indicia, all atop a card base. The polymer layer has surface contours which...
4807970 Holograms in photorefractive materials  
The holographic diffraction efficiencies of photorefractive or electro-optic crystals, such as bismuth silicon oxide (BSO), increase while experiencing high AC voltages. The diffraction efficiency...
4793670 Dynamic hologram recording  
Optical four wave mixing is provided by interfering two waves on a liquid crystal layer (1) temperature stabilized just beneath its nematic/isotropic phase change transition temperature. The liquid...
4786125 Ocular protective apparatus  
A laser shield (FIG. 3) for providing ocular protection against laser hazards, while still providing high photopic or scotopic transmittance and good color discrimination is disclosed. This laser...
4783134 Microwave holograph device  
In a microwave holographic device, the main lobe of a microwave antenna is spatially scanned to receive a microwave signal reflected from an object. The received microwave signal is mixed with a...
4773719 Optical novelty filter  
Changes in an image are detectable by a tracking novelty filter while an incorporated holographic medium is in disequilibrium. A suitably doped single-domain barium titanate crystal can serve as...
4728165 Superimposed fast transient and permanent holographic gratings  
A method is disclosed for producing a superimposed fast transient grating on a permanent holographic grating which provides high scattering ability, fast modulation response times, and the...
4726639 Optically implemented memory correlator using a photorefractive crystal  
An optically implemented technique which generates the correlation function f two electrical signals. A reference signal is used in conjugation with an acousto-optic device to generate an optical...
4721362 Phase gradient contrast microscope  
Apparatus and methods for producing an intensity image from a transparent phase object. A laser beam is generated and expanded. A shutter disposed in the path of the expanded laser beam is opened,...
4703992 Laser beam cleanup by photorefractive two-way mixing  
An apparatus for compressing the spectral distribution of a coherent beam of light includes a narrowband filter for separating the coherent beam into a transmitted portion containing optical energy...
4674824 System for enhancement of optical features  
An optical system for selectively enhancing and/or suppressing the spectral intensity of components in an object beam, is disclosed. In one exemplary application, the optical system includes means...
4673241 Diffraction gratings and optical branching filter elements  
An optical branching filter element comprised of a substrate having a wave guide thereon of a material capable of reversibly changing its refractive index and an erasable diffraction grating formed...
4655542 Optical signal processing arrangements  
Shade or tint intensities in holograms are calibrated by an array of calibration pixels in each hologram. The preferred array consists of crossed lines of the calibration pixels in the hologram...
4592618 Holographic recording and related reading process  
A holographic process is provided for recording-reading by means of index strata in the volume of a photoexcitable storage medium. This process consists in causing two beams to interfere in this...
4586779 Device for memory-storage of a coherent image in a multitude optical cavity  
Device for memory-storage of a coherent image in a multimode optical cavity. A coherent light source generates a signal wave and a reference wave and provides these waves to optical guiding...
4576434 Device for recording a coherent image in a multimode optical cavity  
An optical device for storing a coherent image in a multimode cavity makes use of two interaction media in which photoinduced phase gratings are recorded. By way of example, these media are...
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...
4505536 Optical device for real-time amplification of the radiant energy of a beam  
An object beam and a reference beam incident on a photosensitive recording material interfere with each other to form a refractive-index strata grating. An energy transfer takes place between the...
4492468 Interferometer for the real time display of deformations of vibrating structures  
Display device in which an interferometric hologram corresponding to the vibrations of the object is recorded in a photosensitive electrooptical material. The corresponding interferogram is...
4429954 Spatial light modulator and process of modulation  
Coherent light such as a laser beam is spatially modulated by causing it to interact at a photosensitive material such as a crystal with a focussed image of non-coherent light. An electric...
4310216 Process for manufacturing a device for coupling at least two light conductors and a coupling device according to this process  
A provisional holographic lens H 1 is recorded by causing the interference of a parallel reference beam with a divergent beam emitted from an optical fibre 27, and then a definitive holographic...
4284324 Acousto-optical imagery system based on coherent holographic detection in real time  
The invention relates to the acousto-optical imagery of objects transmitting ultrasonic waves; an optical image diffracted by the action of an ultrasonic wave is detected by coherent detection in...
4214807 Holographic optical satellite communication system  
In a satellite communication system using optical carriers the down link radiation beam pattern is limited to illuminating only the receiver sites for power economy. The transmitting laser's beam...
4138189 Holography using a Bi.sub.12 SiO or Bi.sub.12 GeO.sub.20 recording medium  
A holographic storage cell for storing volume holograms wherein a plate of either Bi 12 SiO 20 or Bi 12 GeO 20 is provided with electrodes producing an electric field transversed to the plate....
4063795 Electro-optic holographic storage device having unlimited record-erase capability  
The present invention relates to a holographic optical storage device utilizing a material in which the transfer of photo-induced charges is orientated along the cristallographic axis C of the...
4055838 Ferroelectric information optical storage device with self biasing  
For amplifying the photosensitivity of a ferroelectric crystal in which information is to be stored, an external field applied to the crystal is created by means of a heavily doped, reduced...
4052119 Crystals for recording phase holograms  
Single crystal electro-optic material useful for recording phase holograms comprises lithium niobate or lithium tantalate doped with iron and silicon.
4038647 Method for holographic storage  
A method of improving the holographic storage of data by yielding brighter olograms with higher densities which comprises recording an interferogram of an object wave and a reference wave into a...
Matches 101 - 150 out of 173 < 1 2 3 4 >