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3940201 Storage-type electro-optical modulator  
A high operational reliability modulator, constituted by a mosaic of elements having variable double-refraction properties. It comprises, on a flat ferro-electric ceramic structure and in respect...
3936139 Holographic memory providing both angular and translational reference beam deflections  
An optical system for the high density storage and retrieving of data, based upon the holographic recording technique, and incorporating two light deviating devices. The first of said devices...
3924924 Holographic memory utilizing a changeable phase object and coherent subtraction  
A pattern generating device includes a plurality of biaxial birefringent irregular ferroelectric crystal elements, each crystal being cut such that mutually opposing planes are normal to any one of...
3902788 Optical memory system for reading, writing and erasing information  
A planar erasable memory material including a sandwich of a ferroelectric element and a photoconductor is addressed by a laser beam emitted from a single two dimensionally scannable electron beam...
3891976 Hologram memory with sequential data storage and beam angular relationship  
A holographic data processing apparatus is described wherein data is holographically recorded on a recording medium with the data arranged in groups of superimposed holograms of data bits. An...
3890035 COMPLEX LIGHT SPATIAL MODULATOR  
A light spatial modulator typically used with computer holography for modulating incident laser light with respect to two factors of three characteristic factors of a light wave, that is, the...
3871740 Binary code conversion to produce binary holograms with enhanced diffraction efficiency  
A method and apparatus for producing hologram memory plates containing a matrix of mini-holograms employs an array of electronically controlled light shutters for generating a mini-hologram by...
3834787 METHOD AND APPARATUS FOR MAKING HOLOGRAPHY MEMORY  
A holography memory, wherein a number of holograms are formed on a predetermined hologram recording medium by the use of reference light beam illuminated at a predetermined angle and an object...
3833893 HOLOGRAPHIC MEMORY INCLUDING CORNER REFLECTORS  
An electrically and optically accessible memory is disclosed in which binary information is stored in a holographic storage medium with a relatively high packing density by an organization in which...
3833281 HOLOGRAPHIC MEMORY WITH FERROELECTRIC-FERROELASTIC PAGE COMPOSER  
A laser holographic memory write-in device comprising a pair of lenses, a pair of polarizers, and a quarter wave plate ([2n + 1]/4 wave plate) and optical shutter crystal both disposed between said...
3831035 SWITCHING NETWORK FOR INFORMATION CHANNELS, PREFERABLY IN THE OPTICAL FREQUENCY RANGE  
The invention relates to a switching network for selectively interconnecting input channels and output channels, in which between the optical outputs of the input channels and the optical inputs of...
3819248 MULTIPLE EXPOSURE HOLOGRAPHIC APPARATUS IN WHICH PHASE RELATIONSHIP IS RANDOMLY CHANGED WITH EACH EXPOSURE  
A multiplex exposure type holographic apparatus, wherein the light which has passed through a two-dimensional light information composing element, such as a light shutter and the interferential...
3806897 ELECTRO-OPTIC IMAGING SYSTEM  
An electro-optic imaging system including an electro-optic device including a photosensitive electro-optic birefringent medium whose birefringence varies as a function of an applied electric field;...
3800298 HOLOGRAPHY MEMORY WITH ZERO-ORDER DIFFRACTION LIGHT REMOVED  
A holography memory apparatus has parallel prisms disposed between the hologram plate and the photosensitive array. A light beam is diffracted at the hologram plate as a coherent light beam and is...
3798620 PAGE COMPOSER TRANSLATING INFORMATION FROM ELECTRICAL TO OPTICAL FORM  
A page composer for translating binary information from electrical to optical form includes an insulating substrate having an array of electrodes on one surface thereof connected by feedthrough...
3798618 HOLOGRAPHY MEMORY APPARATUS USING A SINGLE QUARTER-WAVE SPACIAL MODULATOR  
A holography memory apparatus has an object light beam converted into circularly polarized light by a quarter-wave plate. The circularly polarized light beam is caused to impinge upon a digital...
3779625 HOLOGRAPHIC RECORDING WITH TWO GROUPS OF DIFFERENTLY ORIENTED PLANE POLARIZED OBJECT ILLUMINATION BEAMS  
The present invention is directed to a method and apparatus for recording information on a holographic storage medium which information is presented in an information mask characterized by...
3761155 FARADAY EFFECT PAGE COMPOSER FOR HOLOGRAPHIC MEMORY SYSTEM  
A holographic memory system having an electrically alterable page composer or data mask and a method of modulating a plane polarized laser beam thereby for generating a hologram in the holographic...
3754807 PHASE MODULATION HOLOGRAPHIC DATA RECORDING APPARATUS  
A holographic apparatus for recording digital data comprising a recording medium and means for producing coherently related reference and signal beams in combination with a plurality of phase...
3744871 HOLOGRAPHIC MEMORY SYSTEM FOR RECORDING DIGITAL INFORMATION  
A memory system wherein information is represented as Fourier transforms, which are in turn recorded on a recording medium such as a photographic film with a high packing density by a holographic...
3704929 LARGE CAPACITY ASSOCIATIVE MEMORY EMPLOYING HOLOGRAPHY  
A large capacity associative memory of the holographic type. Coded information uniquely identifying first data and in the form of spatially modulated coherent light rays, forms an interference...
3698010 HETERODYNE READOUT HOLOGRAPHIC MEMORY  
A holographic optical memory utilizes an optical heterodyne technique to significantly increase the signal-to-noise ratio during the readout stage of operation. A light source provides a coherent...
3684351 A FERROELECTRIC-FERROELASTIC ELECTRICALLY OPERATED OPTICAL SHUTTER DEVICE  
An optical shutter or an optical pattern generator, such as a page composer in a laser holographic memory, as an application thereof, comprising a pair of polarizers, and a quarter wave plate [2n +...
3661438 HOLOGRAPHIC DATA STORAGE AND RETRIEVAL SYSTEM  
A holographic data storage and retrieval system, wherein by stacking a plurality of surface recorded flat base members and by edge illumination thereof by a coherent light source, a high density...
3656121 ELECTRICALLY AND OPTICALLY ACCESSIBLE MEMORY  
A computer memory system is disclosed which includes a randomly and electrically accessible semiconductor "page" memory. The semiconductor page memory is conventional to the extent that it includes...
3644013 THREE-DIMENSIONAL CAMERA  
A three-dimensional hologram producing camera utilizing a single lens system for providing a volumetric image on bulk sensitive film having a zone plate positioned in front of the lens to provide...
3643216 HOLOGRAPHIC IDENTIFICATION SYSTEM  
An identification card or credit card contains a unique holographically encoded number which may be decoded by a simple decoder requiring only a single flashlight bulb as a light source for...
3636261 METHOD AND APPARATUS FOR OPTICAL SPEECH CORRELATION  
A system for speech correlation which comprises a coherent light modulating system which accepts a two-dimensional array of information corresponding to a speech spectrogram and superimposes this...
3631411 ELECTRICALLY AND OPTICALLY ACCESSIBLE MEMORY  
A computer memory system is disclosed which includes a randomly and electrically accessible semiconductor "page" memory. The semiconductor page memory is an array of memory units each of which...
3628847 HOLOGRAM MEMORY  
An array of holograms, each representing many light sources, is employed during the write operation. When one of these holograms is illuminated by a laser beam, the reconstructed light sources of...
3627401 BINARY-CODED HOLOGRAM RECORDING SYSTEM  
The invention relates to an information storage system in which the basic storage element is a hologram. Information is recorded (or written) by selectively orienting the plane of polarization of...
3614191 ASSOCIATIVE MEMORY EMPLOYING HOLOGRAPHY  
An associative memory employing holographic techniques. During read-in first and second space modulated beams are each split into true and complementary groups of binary modulated beams. The...
3612641 HOLOGRAPHIC DATA STORAGE WITH AN ORTHOGONALLY CODED REFERENCE BEAM  
A system for holographic data storage in which a large number of holograms are superimposed on a single plate by an array of electro-optic elements placed in the reference beam. The array is...
3608992 MULTIPLEX HOLOGRAPHY WITH TRESNEL DIFFRACTION PATTERN CODED REFERENCE BEANS  
The present invention relates to a method of forming and utilizing a hologram by placing a Fresnel diffraction pattern and a Fourier transform lens in the reference beam during the formation of the...
3584930 HOLOGRAM-WRITING APPARATUS PROVIDING PRECISE TRACKING OF A DEFOCUSED WRITE BEAM  
A hologram-writing apparatus for an optical memory in which a defocused write beam is employed in conjunction with a reference beam to create an interference pattern and a divergent (rather than a...
3580656 HOLOGRAM APPARATUS AND METHOD  
An information processing system is presented for information storage and retrieval with a color center crystal wherein the information to be stored is generated by electrically modulating a light...
3572881 LARGE-CAPACITY ASSOCIATIVE MEMORY EMPLOYING HOLOGRAPHY  
Interference patterns representing data groups are formed in recording plates, which patterns are aligned in a direction transverse to the surface of the recording plate to provide volume, as...
3719409 Title is not available  
3716287 Title is not available  
3675983 Title is not available  
Matches 51 - 90 out of 90 < 1 2