Matches 51 - 100 out of 169 < 1 2 3 4 >
Match Document Document Title
5943144 Process for the manufacture of non-replicable holograms possessing authenticity features and a reading device to check authenticity  
A process for the manufacture of non-replicable holograms possessing authenticity features which are copies of a master hologram. To form a master hologram, a hologram is taken of a randomly...
5877874 Device for concentrating optical radiation  
A holographic planar concentrator (HPC) for collecting and concentrating optical radiation is provided. The holographic planar concentrator comprises a planar highly transparent plate and at least...
5847754 High resolution film scanner/telecine which uses a microlithographic diffuser laminate to aid in the reduction of visibility of surface imperfections in the film  
A high resolution film scanner or telecine uses a microlithographic diffuser laminate (24) arranged adjacent the film. The diffuser diffuses a collimated light beam produced from a light source and...
5822092 System for making a hologram of an image by manipulating object beam characteristics to reflect image data  
A system for converting an image into a hologram formed from diffraction gratings includes obtaining image data for each pixel in an image to be converted, putting it into digital form and using...
5793504 Hybrid angular/spatial holographic multiplexer  
A plurality of holograms are simultaneously angularly and spatially multiplexed within a storage medium by writing the holograms at different locations within the storage medium using reference and...
5721630 High-efficiency reflective holographic diffuser and method for making thereof  
A high-efficiency holographic diffuser is provided, the holographic diffuser being comparatively thin, yet characterized by good optical density along a broad bandwidth. In particular, the...
5687012 Hologram in which a plurality of areas are set and holography system to which hologram is applied  
A hologram is formed using a grating and a second hologram serving as an image hologram. The grating is constituted by a plurality of areas whose spatial frequencies and diffraction directions are...
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...
5642209 Directional light filter and holographic projector system for its production  
A photosensitive optical body is exposed by a diverging three-dimensional standing wave interference pattern generated by a holographic projector system. The projector system, using binary optics,...
5600454 Viewing apparatus  
Viewing apparatus for providing a viewer with an apparent 3-D image includes a diffusing holographic optical element screen, horizontal strip lamps for illuminating the screen from a plurality of...
5570207 Holographic image identification system  
A holographic image identification system includes an image reconstruction device having a laser beam source movable along an arc path to selectively project a laser beam onto a hologram located on...
5548419 Stereo multiplexed holographic particle image velocimeter  
A holographic particle image velocimeter employs stereoscopic recording of particle images, taken from two different perspectives and at two distinct points in time for each perspective, on a...
5548418 Holographic structured light generator  
The present invention is a holographic structured light generator (HSLG) for generating an array of an arbitrary number of laser beamlets from a single laser beam using a point laser light source...
5488494 Packaging system for holographic storage media  
A package for a holographic storage media (10) is provided that utilizes a slide tray (43) for containing a plurality of slides (102). Each of the slides (102) is comprised of an opaque casing...
5479238 High resolution imagery systems and methods  
The current limits of resolution of multi-element optical systems are exceeded by reducing the number of elements while introducing at the critical aperture a blazed transmission grating having...
5418631 Edge-lit holographic diffusers for flat-panel displays  
Methods of recording and using holographic diffusers are disclosed for use with edge-lit backlight assemblies for transmissive flat-panel displays such as LCDs. When the holographic diffuser is...
5416616 Incoherent/coherent readout of double angularly multiplexed volume holographic optical elements  
Novel apparatuses for readout of multiplexed volume holographic optical elements, based on parallel incoherent/coherent double angularly multiplexed holographic recording and readout principles,...
5365354 Grin type diffuser based on volume holographic material  
A diffuser based on a phase volume holographic medium is recorded non-holographically with speckle which define non-discontinuous and smoothly varying change in the refractive index of the medium....
5347376 Method and apparatus for producing a holographic shadowgram  
A method and apparatus for making a holographic shadowgram of an object are disclosed. The method and apparatus include a light source for generating and expanding a coherent light beam. The method...
5315417 Low noise transmission holographic optical element  
A holographic recording medium is treated to reduce or eliminate unwanted extraneous diffraction in a volume transmission hologram. Surface regions of the medium are desensitized either before or...
5307183 Apparatus and method for fabricating a curved grating in a surface emitting distributed feedback semiconductor laser diode device  
An apparatus 10 for exposing a curved grating pattern of monochromatic light on a photoresist coated semiconductor wafer 12 includes an argon gas laser 14 that outputs a monochromatic light beam...
5299035 Holographic imaging through scattering media  
An image of an object embedded in a diffusing medium is formed by propagating a coherent or equivalent light pulse through the diffusing medium and applying a reference pulse so as to gate...
5291321 Method and apparatus for making hologram  
A method and an apparatus for making a hologram wherein interference patterns to be recorded on a hologram plate are prevented from travelling, thereby enabling a high quality hologram to be made....
5291320 Higher order diffraction in holography  
A method and apparatus for highly efficient use of higher-order diffraction beam in holography. The thermoplastic hologram (10) is recorded at a recording angle (θ R ) between two coherent beams...
5289252 Linear frequency modulation control for FM laser radar  
A closed loop frequency control system for maintaining accurate linearity in the transmitted signal (60) in a linear frequency modulated (LFM) chirped laser radar system. A correction signal (50),...
5270853 Method and apparatus for imaging an object in or through a scattering medium by using multiple-wave mixing  
A method and apparatus for imaging an object that is part of, embedded in, or viewed through a scattering medium is provided. A broadband stochastic beam generator, such as a broadband laser,...
5262879 Holographic image conversion method for making a controlled holographic grating  
A method for converting a 2-D image into a hologram is set forth. An optical scanner system which measures the primary color intensity of a selected pixel and forms an indication thereof is...
5258863 Method for effecting illumination of an arbitrary aperture  
The present invention discloses a novel method for effecting illumination of an arbitrary aperture. The method comprises a first step of providing a developed hologram comprising a plurality of...
5257118 Method for holographically combining laser beams  
A holographic recording of the interference between an object laser beam and a reference laser beam is used to combine the amplitudes of multiple laser beams which are conjugates of the reference...
5253086 Holographic device for combining laser beams  
A holographic recording of the interference between an object laser beam and a reference laser beam is used to combine the amplitudes of multiple input laser beams which are conjugates of the...
5245448 Apparatus for producing a moving 3-dimensional image  
A moving holographic image is projected into three space by producing a series of slides or fixed holographic images in quick succession in a process similar to a conventional motion picture All of...
5235442 Method for the recording and for the visual restitution of a tridimensional scene  
The invention relates to a method for the photographic recording and the visual restitution of a tridimensional scene by means of a coherent light source (1). According to the invention, in view of...
5191448 Photorefractive square law converter  
A photorefractive device is provided for converting an image-bearing incoherent input beam to a high contrast coherent output beam the intensity of which varies as the square of the input intensity...
5182180 Dry film process for altering the wavelength of response of holograms  
The process is disclosed for altering the wavelength response of a volume phase reflection hologram by contacting the hologram with a diffusion element containing a monomer. Monomer in the...
5151724 Dynamic holographic display with cantilever  
A dynamic holographic display has an array of reflective surfaces formed on cantilever structures substantially parallel to the surface of a substrate, such as a silicon wafer. A holographic image...
5145756 Method for making a holographic mirror  
A holographic mirror is made by a process of continuous exposure. For this purpose, a photosensitive layer (10) is exposed strip by strip in a direction crosswise to that in which the layer is...
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...
5124815 Method for forming holographic optical elements free of secondary fringes  
Holographic optical elements relatively free of unwanted, secondary fringes are produced using light having a limited coherence. A photosensitive material of a predetermined thickness records the...
5121227 One step rainbow holography  
Improved optical holographic apparatuses are disclosed for making white light viewable rainbow holograms in one step utilizing concave mirror optics. On-axis and off-axis configurations are...
5071208 Two beam method for forming holographic optical elements free of secondary fringes  
Holographic optical elements relatively free of unwanted, secondary fringes are produced by passing the light beam from a laser through a rotating diffusing plate to generate a beam of light having...
5056880 Holographic wallpaper  
An inexpensive wallpaper, which may be plastic and self adhesive. Using the positive features and advantages of thin-layer holograms and other existing technology, the claimed invention produces a...
5052765 Scanning fiber optic holographic exposure and feedback system  
A fiber optic point source is utilized to generate a first wavefront which is intersected with a second wavefront to form a desired interference pattern in a recording medium. The point source is...
5052764 System and method for forming a holographic exposure with a simulated source  
A fiber optic point source is utilized to generate a first wavefront which is intersected with a second wavefront to form a desired interference pattern in a recording medium. The point source is...
5046793 Chromatically corrected directional diffusing screen  
A holographic diffuser provides a high degree of chromatic correction, or color balance, within a selected eyebox and the ability to generate more than one specific eyebox for multiple observer...
5046792 Holographic printer  
This invention is an optical printer that translates and records visual information that can be seen with ambient light in the first generation holographic printing. The invention permits recording...
5024909 Dry film process for altering wavelength response of holograms  
Wavelength response of volume holograms is altered by contact with a dry film diffusion element.
4989071 Method of preparing a hologram using readily available light sources  
A method of preparing a color separation holographic master which can be used in the preparation of a colored hologram of an object, by illuminating the object with light having a very narrow...
4987479 Method of preparing a color hologram suitable for display purposes  
A method of preparing a hologram of an object on holographic material by a holographic laser exposure, by illuminating the object with white light and capturing the luminance values of the object...
4983004 Apparatus for three-dimensional viewing of magnetic resonance imaging tomograms  
A plurality of liquid crystal displays, each able to independently display one of a plurality of MRI tomograms, is dispersed such that the display screen of each appear planar from a common point...
4959283 Dry film process for altering wavelength response of holograms  
Wavelength response of volume holograms is altered by contact with a dry film diffusion element.
Matches 51 - 100 out of 169 < 1 2 3 4 >