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5995251 |
Apparatus for holographic data storage
A holographic data storage apparatus having no readout lens. The apparatus has a spatial light modulator (SLM), a focusing element such as a lens, a holographic data storage material and a spatial...
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5991078 |
Display medium employing diffraction grating and method of producing diffraction grating assembly
A display medium employing a diffraction grating to define and represent a display pattern by the contour thereof, which enables the display pattern to move smoothly as the visual point moves and...
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5986781 |
Apparatus and method for generating diffractive element using liquid crystal display
Device, method, and system for recording diffractive high resolution text, pictorial, and/or other graphical information is provided which is particularly suited to recording information that would...
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5986780 |
Hologram reconstructing apparatus
This specification discloses a hologram reconstructing apparatus having interference fringe forming means for forming optical interference fringes in conformity with an input signal, information...
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5982513 |
Method and system to align holographic images
A method and a system to re-align onto a detector array a holographic image of a Fourier region hologram stored in a medium, with the medium spinning around a first axis, and the hologram being...
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5978112 |
Non-volatile readout of shift multiplexed holograms
The present invention is a holographic reconstruction device for reconstructing successive holograms previously recorded by a recording reference beam in a recording medium, each previously...
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5973807 |
Large display composite holograms and methods
A composite hologram comprises a plurality of hologram tiles arranged for display, each of said hologram tiles formed by exposing each of a plurality of different unexposed photographic plates...
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5973806 |
System and method for steering Fresnel region data using cylindrical coordinates to access data locations in a holographic memory
Systems and methods for steering an optical path to gain access to data locations in a holographic memory cell (HMC). One of the systems includes: (1) first and second reflective elements locatable...
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5969832 |
Projection image display device
A projection image display device includes, a light source, an image display panel having a number of pixels and a vertical scanning function, an optical system for dividing light from the light...
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5963345 |
Holographic stop sign
A warning indicator that comprises a lamp hidden adjacent to the roof of a vehicle, such as a school bus, and a transmission hologram decal containing a hologram that is mounted on a front or rear...
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5959747 |
Compact architecture for holographic systems
An architecture for holographic data storage and processing integrates multifunctional silicon-based optoelectronic devices, rewritable holographic material, optical devices and other...
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5956164 |
Two-dimensional/three dimensional graphic material and method of making same
Graphic material includes at least one area bearing a hologram and at least one area bearing a diffraction grating. Preferably, the diffraction grating and the hologram are simultaneously viewable...
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5949559 |
Method and apparatus for creating holographic stereogram
A method and an apparatus for creating a holographic stereogram are provided for canceling noises localized to infinity and offering a high-quality hologram. The creating method is executed to...
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5949558 |
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...
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5946115 |
Hologram memory device
Fast speed hologram memory device, including a first holographic optical element array for directing a reference beam to a desired hologram memory cell directly and a second holographic optical...
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5943145 |
Phase distance multiplex holography
Selection of individual holograms during read-out of a multiplexed array depends upon varying relative position of the recording medium in the direction orthogonal to the medium surface.
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5930011 |
Holographic Multicolor optical elements for use in liquid crystal displays and methods of making the elements
The present invention relates to holographic multicolor optical elements for use as multicolor filters in liquid crystal displays and methods of making the elements. The elements can be used as...
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5926294 |
Three-dimensional image display device having an elementary hologram panel and method for manufacturing the elementary hologram panel
A three-dimensional image display device capable of displaying a wide screen three-dimensional image which one can easily observe from any position and direction in the same way as viewing an...
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5894359 |
Color filter and color display apparatus
A color filter includes a plurality of color pixels, and a first hologram diffracting an incident light beam into a first diffraction-resultant light beam. The color filter also includes a second...
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5892601 |
Multiplex holography
Use of an aperture in the reconstructed beam in reconstruction of multiple holograms increases selectivity beyond that realizable by spatial multiplexing so as to permit differentiation of...
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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...
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5886798 |
Information carriers with diffraction structures
An information carrier has at least one diffraction pattern which is formed from microscopically fine relief structures and which, upon being illuminated with coherent light, produces in two...
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5877875 |
Reference beam auto-focus apparatus for modularized volume-holographic memory
In a method for addressing holograms stored in a plurality of separate storage media, a reference beam is directed to a selected one of the plurality of storage media, the reference beam is then...
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5856048 |
Information-recorded media and methods for reading the information
The invention is directed to an information-recorded medium with easily selectable and identifiable items of information, which is virtually protected against forgery and has enhanced security...
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5852504 |
Stereoscopic display method of hologram and its forming method and its stereoscopic display apparatus
A hologram of a virtual object or an object which actually exists is formed and a solid image is displayed. 3-dimensional information of the object to be displayed is divided into regions in the...
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5844701 |
System and method using linear translation to access data locations in a holographic memory
Systems and methods for steering a complex, spatially-modulated incident beam of light from a spatial light modulator to gain access to data locations in a holographic memory cell (HMC). One of the...
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5844700 |
Spatio-angular multiplexing geometry for volume holographic storage
Partially overlapping holograms are stored in a cylindrical volume holographic storage medium capable of rotation about and translation along its longitudinal axis. The reference and signal beams...
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5812292 |
Optical correlator using optical delay loops
An optical correlator is disclosed that compares signals of interest with lected reference signals stored in holograms. The holograms are arranged so that the selected reference signals impinge...
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5808998 |
Bit error rate reduction by reducing the run length of same-state pixels in a halographic process
Bit error rate of an output data stream, reconstructed from a holographic recording, is reduced by reducing the length of same-state pixels on the spatial light modulator.
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5808776 |
Process for realization of an optically variable image
Method for the production of an optically variable image including an animated element used as the model for the reproduction of a security element, by insolation of a light-sensitive material...
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5796500 |
Methods and apparatus for making holograms
A method and apparatus (300) for making holograms includes a technique for exposing a film substrate (319) or other light sensitive medium to consecutive two-dimensional images, together...
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5760933 |
Stereoscopic display apparatus and method
In a method and apparatus for displaying a stereoscopic image, a plurality of 2-dimensional images having parallaxes in only horizontal directions are obtained and inputted when an object to be...
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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...
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5748347 |
Image recording medium and method of making same
A product, method, and apparatus are provided for making a stereoscopic hologram from a series of two-dimensional views of an object. The two-dimensional views are obtained from, for example,...
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5739930 |
Display apparatus
In a display section, a plurality of pixels of minimum display units to display a hologram phase distribution are arranged to thereby construct a cell to display one pixel of a 2-dimensional image,...
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5734485 |
Large display composite holograms and methods
A composite hologram incorporates a plurality of hologram tiles arranged for display, each of the hologram tiles formed by exposing each of a plurality of different unexposed photographic plates...
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5724162 |
Optical correlator using spatial light modulator
An optical correlator is disclosed that compares signals of interest agai selected reference signals stored in holograms both of which are imaged onto a spatial light modulator comprising electron...
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5724161 |
Holographic information display for exterior vehicle application
Apparatus comprising a decal disposed on an interior surface of a window and a light source for projecting light onto the to display an image outside of the vehicle. The decal comprises a...
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5719691 |
Phase correlation multiplex holography
Holograms within an array are recorded and/or read out by use of a reference/read out beam produced by illumination of a phase mask.
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5717509 |
Stereoscopic display method of hologram and its forming method and its stereoscopic display apparatus
A hologram of a virtual object or an object which actually exists is formed and a solid image is displayed. 3-dimensional information of the object to be displayed is divided into regions in the...
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5717508 |
Method for dynamically refreshing angle-multiplexed holograms in photorefractive media
A method and system are disclosed for dynamically refreshing angle-multiplexed holograms stored in a photorefractive medium. In accordance with the invention the photorefractive medium is...
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5703705 |
Tilt multiplex holography
A system for high density holographic storage announced by Cal Tech is improved. The basic Cal Tech system records successive holograms by physically shifting the recording medium relative to the...
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5691989 |
Wavelength stabilized laser sources using feedback from volume holograms
A laser utilizes feedback from a volume holographic grating used as a wavelength standard to lock the laser output wavelength to its desired value. This feedback can be non-optical, wherein the...
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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...
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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...
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5680231 |
Holographic lenses with wide angular and spectral bandwidths for use in a color display device
The angular and/or spectral bandwidth of a holographic lens assembly can be widened to accomodate highly diverging and/or wide spectral bandwidth illumination sources, respectively. Each lens in...
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5675437 |
Light control film for use in viewing holograms and related method
An apparatus for reconstructing holographic images includes a white light source, diffraction grating (1112) for generating zero-order diffracted light (1416) and at least first-order diffracted...
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5672448 |
Multi-exposure system for hologram
A hologram forming system for forming holograms on multiple exposures is provided. In this system, a holographic recording medium is exposed to light beams at least twice at incident angles...
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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...
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5663816 |
Liquid crystal display device comprising reflective holographic
A liquid crystal display device (30) that is illuminatable by diffuse ambient light comprises a liquid crystal panel (32) and a reflective holographic optical element (34). Diffuse ambient light...
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