Matches 151 - 173 out of 173 < 1 2 3 4
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3997350 Holographic storage material  
Holographic storage materials are disclosed including lithium niobate in the form of a single crystal added with either from 0.001 to 3.0 molar percent of iridium or from 0.01 to 1.0 molar percent...
3940748 Optical information processing system with color center crystal  
An optical information storage and retrieved system is presented wherein intersecting beams of coherent light at least one of which is information bearing are used to change the state of color...
3933504 Photochromic lithium niobate and method for preparing same  
Photochromic lithium niobate crystals containing iron and either manganese or copper are useful for recording phase holograms in the photosensitive state of the crystals, which holograms can be...
3932299 Method for the reduction of iron in iron-doped lithium niobate crystals  
Lithium niobate single crystals doped with iron can be treated to reduce trivalent iron to divalent iron without reduction of the lithium niobate host crystal, by surrounding the crystal with a...
3922061 Optical storage apparatus and process  
Holographic apparatus utilizes a multiphoton process for writing and single photon for reading. Dependence upon a virtual first photon absorption rather than an actual absorption for the...
3915549 Crystals for recording phase holograms  
Single crystal electro-optic material useful for recording phase holograms consists of lithium niobate doped with iron or manganese or lithium tantalate doped with iron. These crystals may also...
3873179 Lithium niobate hologram readout using continuous incoherent noise erasing light  
Spurious optical damage on readout of volume holograms stored in crystals, such as Fe-doped LiNbO 3 is minimized by illuminating the crystal with broadband incoherent wave energy while the crystal...
3861784 PROGRAMMABLE DIFFRACTION GRATING  
An electrically alterable apparatus and method of operation thereof that permits the optical processing of an image is disclosed. The apparatus includes an array of optical cells comprised of a...
3847465 HOLOGRAM FORMATION WITHIN A POLYCRYSTALLINE PHOTO EXCITABLE ELECTRO-OPTIC PLATE  
The present invention relates to holographic systems embodying a phase hologram pattern formed within the volume of a photoexcitable, electro-optic material. The system in accordance with the...
3825316 APPARATUS FOR PROVIDING AN OPTICAL SYSTEM USING ADAPTIVE HOLOGRAPHIC COMPONENTS  
A laser produces a beam of polarized coherent light which is transmitted through a polarization switching device that adjusts the orientation of the plane of polarization of the transmitted light...
3799642 HOLOGRAPHIC RECORDING ON PHOTOCHROMIC LITHIUM NIOBATE  
Photochromic lithium niobate crystals containing iron and either manganese or copper are useful for recording phase holograms in the photosensitive state of the crystals, which holograms can be...
3782802 FERRO-ELECTRIC SYSTEM FOR BULK STORAGE OF PHASE HOLOGRAMS  
The present invention relates to phase holography and more particularly to ferro-electric systems for bulk storage of phase holograms. The system in accordance with the invention comprises a photo...
3781084 REVERSIBLE PHASE MODULATING ELEMENT  
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...
3773400 PROCESS FOR FIXING HOLOGRAPHIC PATTERNS IN ELECTRO-OPTIC CRYSTALS AND THE CRYSTALS PRODUCED THEREBY  
Phase holograms recorded in single crystal electro-optic materials such as undoped or doped lithium niobate and barium sodium niobate doped with iron and molybdenum are fixed so that the...
3703328 DEVICES UTILIZING IMPROVED LINBO' HOLOGRAPHIC MEDIUM  
Volume holographic devices utilize lithium niobate, LiNbO 3 , containing added iron ions. The added ions provide for improved resolution and contrast. Utilization is made of the improved material...
3652145 ELECTRICALLY CONTROLLABLE VOLUME HOLOGRAPHIC APPARATUS AND METHOD FOR OPERATING SAID APPARATUS  
An electrically controllable volume holographic storage apparatus comprising a ferroelectric crystalline member having electrodes affixed thereto for establishing an electric field in the member,...
3647959 SYSTEM FOR GENERATING A HOLOGRAM  
A hologram is generated by first providing a holographic signal representing scanning of a standing wave interference pattern. The signal controls generation of local perturbations in a target...
3635538 STACKED HOLOGRAM APPARATUS  
A data storage device including a stack of birefringent crystalline holographic plates serially disposed in the path of a playback beam and further including means cooperating with the holographic...
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...
3544189 HOLOGRAPHY USING A POLED FERROELECTRIC RECORDING MATERIAL  
3778361 Title is not available  
3717415 Title is not available  
3671096 Title is not available  
Matches 151 - 173 out of 173 < 1 2 3 4