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8132923 |
Cooling device and image projection apparatus having the same
A cooling device which prevents ambient persons from being exposed to an unpleasant feeling as much as possible by properly controlling an exhausting direction of the air which is used for cooling...
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8002413 |
Light source unit and projector
There is provided a light source unit which includes a luminescent light source which receives excitation light so as to emit light of a predetermined wavelength band, excitation light sources...
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7999983 |
Lens material, optical electronic component and optical electronic device
An optical material includes lithium tantalate, and a molar composition ratio of lithium oxide and tantalum oxide (Li2O/Ta2O5) in the lithium tantalate is in the range of 0.975 to 0.982. Since an...
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7973989 |
System and method using a voltage kick-off to record a hologram on a photorefractive polymer for 3D holographic display and other applications
An updateable system and method of recording a hologram on a media simultaneously reduces the writing time and increases persistence without sacrificing diffraction efficiency. A voltage kick-off...
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7636171 |
Storage media monitoring method for archive management
A method is provided for monitoring degradation of a data storage medium. Multiple reactive elements are provided in the data storage medium. Properties of each one of these elements is determined,...
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7630110 |
Three-dimensional hologram image display apparatus and three-dimensional hologram image display system
A three-dimensional hologram image display apparatus displays a three-dimensional hologram image by use of computed interference fringe patterns. The three-dimensional hologram image display...
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7601957 |
Electron microscope and combined illumination lens
An object of the present invention is to provide an electron microscope that employs a hologram of a diffraction pattern to reconstruct a microscopic image involving no imaging aberration due to...
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7534412 |
Large-volume CaF2 single crystals with reduced scattering and improved laser stability, and uses thereof
Single crystals with low scattering, small refractive index differences and few small angle grain boundaries have a bi-directional scattering distribution function value (BSDF) of less than...
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7483190 |
Method and apparatus for implementing a multi-channel tunable filter
The present invention provides a multi-channel tunable filter and methods for making such a filter. In one embodiment, the filter comprises a bank of gratings or a continuously varying filter...
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7429437 |
Diffractive optical element and method of manufacture
A diffractive optical element such as a diffuser, diffraction grating, and/or hologram, can be manufactured by using a surface relief pattern on a surface of a surface relief tool. A layer of...
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7298685 |
Method and apparatus for recording to and reading from a multi-layer diffractive optics memory
The present invention comprises an apparatus and method for recording information on a multi-layer diffractive optics memory to extend storage capacity. A composite mirror device comprises a...
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7149014 |
Holographic memory using beam steering
A method, apparatus, and system provide the ability for storing holograms at high speed. A single laser diode emits a collimated laser beam to both write to and read from a photorefractice crystal....
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7123393 |
Method and apparatus for holographic recording and retrieval
A wavelength multiplexed holographic system includes a wavelength tunable blue-violet laser and a controller for wavelength multiplexing. A method of holographic data recording includes providing a...
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7054043 |
Security element
The invention relates to an object of value with a security element having at least a first and a second liquid-crystalline material, the first material having thermochromic properties and the...
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7034971 |
Fabrication of sandwiched construction media
In one embodiment, holographic data storage medium includes a first thermoplastic substrate portion having a thickness less than approximately 2 millimeters and a second thermoplastic substrate...
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7031037 |
Holographic recording medium and holographic recording medium manufacturing method
A holographic recording medium includes a transparent layer having a servo surface and a light incidence surface which face each other; a reflecting layer formed on the servo surface-side...
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7019874 |
Holographic memory system including a photodetecting device provided with a band-pass filter
A holographic memory system includes a light source for generating a reference beam having a wavelength; and a photodetecting device for selectively detecting a reconstructed signal beam...
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6961160 |
Recording material for holograms, manufacturing method thereof, recording medium for holograms, hologram recording method and hologram reproduction method
A recording material for holograms includes a metal oxide porous body with an oxygen donor substance in the pores. In addition, a method manufactures a recording material for holograms that include...
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6909528 |
Phase volume hologram and method for producing the phase volume hologram
A phase volume hologram and a method for producing the phase volume hologram are described herein. The phase volume hologram is made by filling the microcavities of a porous transparent siliceous...
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6906835 |
Doped stoichiometric lithium niobate crystals and method for high-speed holographic data storage
The present invention discloses a recording medium comprising an improved doped Stoichiometric Lithium Niobate (SLN) crystal for high-speed holographic data storage. The improved doped SLN has an...
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6900914 |
Optical information recording and reproducing apparatus having volume holographic memory
A description is provided of an optical information recording and reproducing apparatus having a volume holographic memory. The apparatus is capable of recording an interference pattern in the...
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6862120 |
Hologram recording medium, hologram recording method and hologram recording and reproducing apparatus
In a hologram recording method for forming a plurality of areas of a refractive index light interference pattern of a coherent signal light beam in accordance with information data within a...
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6856433 |
Holographic recording medium and holographic recording/reproducing apparatus using the same
A holographic recording medium exhibiting a high recording sensitivity without execution of reduction treatment. A system records information on the holographic recording medium by using a gating...
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6686097 |
Reversible hologram fixation in photorefractive materials using incoherent ultraviolet light
A holographic information storage and retrieval system provides an all-optical reversible method to fix information in doped or undoped photorefractive materials. The fixed information is...
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6670079 |
Photorefractive material
A photorefractive material provides a high photosensitivity without reduction. The material comprises a single crystal of terbium (Tb)-doped niobate or tantalate. The single crystal is a single...
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6629762 |
Electric field sensor using liquid crystal and three-dimensional movie player/recorder using the same
Liquid crystal is filled between a pair of transparent plate electrodes, and a DC voltage is applied between the electrodes to align the liquid crystal molecules along the electric field. When...
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6585382 |
Optical systems using switched mirrors
An optical system having at least one switched mirror for switching and routing at least one incident beam of electromagnetic radiation. The switched mirrors are controlled by a voltage source and...
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6542264 |
Electro-holographic optical switch
The present invention relates to an optical switch comprising a paraelectric photorefractive material, storing a hologram, possibly a latent hologram, whose reconstruction, or activation and...
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6525821 |
Acquisition and replay systems for direct-to-digital holography and holovision
Improvements to the acquisition and replay systems for direct-to-digital holography and holovision are described. A method of recording an off-axis hologram includes: splitting a laser beam into an...
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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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6414762 |
Optical information recording and reproducing apparatus using a holographic memory
An optical information recording and reproducing apparatus, which detachably supports a holographic memory formed of a photorefractive crystal, includes a portion for supplying a coherent reference...
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6407831 |
Coherent interaction of optical radiation beams with optical-electronic materials of generalized crystal symmetry
A method for optimizing the interaction of a resonant material having generalized crystal symmetry with a beam or beams of radiation. The invention includes determining a special direction relative...
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6373603 |
Image generating system including compensation for chromatic dispersion
A system and method for generating a system are disclosed. The system includes a display device comprising a plurality of display regions, each region configured for displaying a color component of...
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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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6353489 |
Optical retro-reflection device
An optical retro-reflective apparatus for application to reconfigurable displays for highway signs and other applications is disclosed. In a first preferred embodiment, the apparatus includes a...
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6323970 |
Method of producing switchable holograms
A method of producing a switchable hologram generally comprises providing a substrate comprised of a liquid crystal material and having two generally opposed surfaces and recording a plurality of...
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6320683 |
Optical information recording and reproducing apparatus using a volume holographic memory
A description is provided of an optical information recording and reproducing apparatus which detachably supports a volume holographic memory formed of a photorefractive crystal. The apparatus...
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6281994 |
Method and apparatus for three-dimensional holographic display suitable for video image display
A method and an apparatus for three-dimensional holographic display suitable for moving object display are disclosed. At least one hologram of a display target object is displayed on a display...
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6226415 |
Noise reduction in volume holographic memories
A method for improving the quality of holographic images by reducing local noise in a holographic memory system is disclosed. The method is characterized by: storing a white reference image and a...
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6157470 |
Non-volatile holographic storage in doubly-doped photorefractive material
A non-volatile holographic recording method and system based on a doubly-doped photorefractive material. One embodiment of the holographic material is doped to have first and second types of...
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6153339 |
Volume holographic data storage with doped high optical quality glass
A volume hologram is created by exposing a volume holographic optical storage medium comprising a doped optically transparent glass matrix having a scattering coefficient of less than 10-5 cm-1 to...
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6137601 |
Incoherent erasure joint transform correlator
A holographic grating is written into a photorefractive erasable holographic member and a light beam having a first wavelength which includes the joint power spectrum of a pair of joint images to...
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6118560 |
Scatter noise reduction in holographic storage systems by signal-noise orthogonalization
A method and an apparatus for increasing detection signal-to-noise ratio, by reducing the effect of optical scatterers from a holographic storage medium, are disclosed. The method comprises the...
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6088139 |
Method and an apparatus for recording and reproducing using a hologram, an apparatus for irradiating light for reproduction to a hologram, a hologram device and a manufacturing method of the same
Object rays and reference rays are projected to record interference fringes on a volume hologram comprising a material exhibiting a photoinducing refractive effect, and a reconstructed image is...
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6046830 |
Dynamic refresh for optical data storage
A method for dynamically refreshing a holographic data storage medium wherein data is stored in a plurality of data pages, each of which comprises a two dimensional pattern of pixel data. Each data...
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6043910 |
Multiple active computer generated hologram
Apparatus which allows selection and generation of a variety of hologrammatic optical wavefronts. A device, which comprises a substrate layer of varying thickness and an electro optic layer, with a...
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6031643 |
Method for holographic storage
The present invention is a method for optical data storage which enhances the contrast between ON and OFF pixels. The method comprises writing a two-dimensional image comprising a plurality of...
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5978108 |
Two-step gated holographic recording in photorefractive materials using cw lasers
Ferroelectric materials are disclosed as reversible holographic recording media (25) for use in two-photon recording systems. The ferroelectric materials disclosed herein provide long-lived...
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5940514 |
Encrypted holographic data storage based on orthogonal phase code multiplexing
An encryption method and apparatus for holographic data storage are disclosed. In a system using orthogonal phase-code multiplexing, data is encrypted by modulating the reference beam using an...
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5905584 |
Hologram recording and reproducing apparatus
In a hologram recording and reproducing apparatus including a hologram record element having a record unit formed by a photorefractive single crystal and a pair of electrodes provided on the record...
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