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7440154 Fourier transform lens system and holographic storage system using same  
A Fourier transform lens system includes a first lens group having positive power, a second lens group having positive power, and a third lens group having negative power, all arranged on a common...
7423808 Rear projection screen with spatial varying diffusing angle  
A Fresnel lens of the prior art is split into two Fresnel lenses to allow easier control of the horizontal and vertical viewing angles. In a second embodiment, the Fresnel lens is entirely...
7417776 Hologram recording and reproduction method, hologram recording and reproduction apparatus, and hologram recording medium  
A method and apparatus is disclosed which can reproduce multi-value data with high reproducibility from a hologram recording medium having data recorded in multi-values therein and can reduce the...
7411708 Method and apparatus for phase-encoded homogenized Fourier transform holographic data storage and recovery  
An apparatus for writing and reading holograms, comprising a spatial light modulator (SLM) operable in phase mode, having a plurality of pixels for generating an object beam that overlaps with a...
7355767 Hologram recording method and hologram recording apparatus  
A hologram recording method includes generating a signal beam with data formed by superimposing pattern data, the pattern data representing a pattern in which a large number of plural kinds of...
7319550 Method and apparatus for recording hologram, method and apparatus for reproducing hologram, and information retaining body  
While Fourier transformation of a signal light beam is performed to perform recording during holographic recording so that a focal point is formed outside a holographic recording layer (defocus...
7315408 Video hologram and device for reconstructing video holograms for large objects  
A video holographic display device operates so that the size of a reconstructed three dimensional scene is a function of the size of the hologram-bearing medium; the reconstructed three dimensional...
7307768 Hologram recording method and hologram recording apparatus  
A hologram is recorded by irradiating, with a reference light beam, a region corresponding to an intensity distribution of a signal light beam on an optical recording medium. For example, the...
7304776 Integrated optical structures with electrically conductive parts  
The invention concerns a integrated optical structure comprising a plurality of parts made at least of a dielectric material, stacked according to the levels of integration and defining at least an...
7262892 Hologram reconstruction method and device  
There is provided a hologram reconstruction method including: onto an optical recording medium in which a hologram is recorded by simultaneously irradiating the Fourier transformed signal beam...
7212323 Methods and apparatus for mass manufacturing two-dimensional binary information on transparent substrates using phase contrast modulated templates  
Methods and apparatus for making, encoding, and encrypting binary patterns for storing recorded information. One of the methods includes the steps of providing an original image, fragmenting the...
7209269 Displaying holographic three dimensional images  
Holographic three dimensional images of objects can be displayed via a device comprising micro holographic optical elements (MHOEs). A device for displaying holographic three dimensional images of...
7199912 Fourier transform lens system and holographic storage system using same  
A Fourier transform lens system includes: a first lens group having negative power and a second lens group having positive power disposed at one side of the first lens group with the first lens...
7193754 Method for calculating and producing a computer-generated hologram and also a storage medium with a computer-generated hologram and a reading device  
The invention relates to a method for calculating a computer-generated hologram, in which the pixel distribution of the computer-generated hologram is calculated, in which the pixel distribution of...
7180644 Holographic storage lenses  
Disclosed are holographic storage systems and lenses for holographic storage systems. The lens units can be of a two-component design. The lenses can be used to both record to photorefractive...
7161721 Computer generated holograms  
A method of generating a binary computer generated hologram for use in displaying a holographic image, the method comprising the steps of generating a complex modulation computer generated hologram...
7099590 Filtering technique for free space interconnects  
A filtering technique for a free space communication that features encoding and decoding of signals employing a filtering apparatus that includes a bulk holographic transform function. Employing...
7095540 Optical security system using fourier plane encoding  
A method of verifying the authenticity of an object is presented. The method comprises providing a primary image; providing a secondary image; encoding the primary image; providing a random code;...
7039252 Iterative approximation environments for modeling the evolution of an image propagating through a physical medium in restoration and other applications  
Image processing utilizing numerical calculation of fractional exponential powers of a diagonalizable numerical transform operator for use in an iterative or other larger computational...
6961159 Holographic viewing device, and computer-generated hologram for the same  
The invention relates to a holographic viewing device that enables a given pattern to be properly viewed in place of light sources in a scene and is easy to fabricate and assemble with consistent...
6924942 Holographic storage lenses  
Disclosed are holographic storage systems and lenses for holographic storage systems. The lens units can be of a single-component design. The lenses can be used to both record to photorefractive...
6879441 Holographic spectral filter  
Method and apparatus are contemplated for receiving from an input, an optical signal in a volume hologram comprising a transfer function that may comprise temporal or spectral information, and...
6870649 Holographic viewing device, and computer-generated hologram for the same  
The invention relates to a holographic viewing device that enables a bright reconstructed pattern to be viewed in place of light sources in a scene while a spot due to zero-order transmitted light...
6859318 Method for forming a holographic spectral filter  
Method and apparatus are contemplated for receiving from an input, an optical signal in a volume hologram comprising a transfer function that may comprise temporal or spectral information, and...
6853812 Polarized-holographic filtering providing improved extinction ratio  
A filtering technique for free space communication that features an improved extinction ratio by providing a filter that employs a bulk holographic transform function and a polarizing film. In this...
6844947 All-optical holographic code division multiple access switch  
A technique for processing optical input signals to produce optical output signals using only a single hologram for a plurality of circularly shifted code words used to encode the input signals. A...
6831762 System and method for holographic storage with optical folding  
A system for recording and reading out holograms in a storage medium including a pattern encoder, a first fourier transform lens with a focal length f 1 , a second fourier transform lens with a...
6825959 Holographic viewing device, and computer-generated hologram for the same  
The invention relates to a holographic viewing device that has a high diffraction efficiency, enables bright patterns with less noticeable conjugate or higher-order images to be viewed in place of...
6775037 Grating matrix recording system  
A dot matrix system, which uses an electronic display panel as a diffractive optical device to produce two laser beams. The interference pattern of these two beams, at the focal plane of a lens,...
6762865 Self-referenced holography using diffusive element  
The invention is directed to self-referenced holographic recording techniques that make use of a diffusive element. Self-referenced holography refers to holographic recording techniques in which a...
6710901 Method and apparatus for two-photon, volumetric spatially resolved holographic data storage in photosensitive glass  
A method for the generation of volume spatially-resolved holographic data storage within a photosensitive glass sample that incurs changes of optical properties in response to two-photon...
6674555 Method and apparatus for holographic data storage  
Apparatus for holographic recording of information includes a lens or lens system, referred to here as the “FT lens,” situated in such a way that light from an object beam enters the FT lens...
6631017 Matched amplification and switch joint transform correlator  
A matched amplification correlator transforms input images projecting a real time hologram upon a holographic storage device and a spatial light modulator, optically coupled to the storage device,...
6538776 Self-referenced holographic storage  
The invention presents the concept of self-referenced holographic data recording. In exemplary embodiments, the invention comprises methods of recording holograms on holographic data storage media;...
6490088 Optical system using a radial harmonic pupil filter for generating collimated beams  
A Fourier hologram with the distribution of a radial harmonic function creates, in the far field, a pseudo non-diffracting beam. The properties of this pseudo non-diffracting beam can be set by...
6466372 Systems for projecting images from diffractive phase plates  
A system for projecting images is provided having a group of diffractive phase plates each encoded with different image information which have phase shifts aligned to reconstruct visible images in...
6411406 Holographic microscope and method of hologram reconstruction  
A holographic microscope is described along with a method for numerically reconstructing a holographic image. The method uses a coordinate transformation of the Kirchhoff-Helmholtz equation to...
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...
6301028 Holographic memory and optical information recording and reproducing apparatus using the same  
A description is provided of an optical information recording and reproducing apparatus employing a holographic memory. The apparatus includes a mask disposed in an optical path of the signal light...
6285474 Holographic recording method and filtering method  
A method and an apparatus capable of filtering based on desired spatial frequency characteristics without loss of Fourier spectrum frequency components, and of matched filtering of high recognition...
6281993 Phase shifting element for optical information processing storing systems  
Optical information processor and storage of pixelated data pattern in a Fourier plane of a lens as achieved by a plurality of optical elements operating with a spatial light modulator. A laser...
6275310 Modified minimum distance criterion for blended random and nonrandom encoding  
Two pixel-oriented methods for designing Fourier transform holograms, pseudorandom encoding and minimum distance encoding when combined usually produce higher fidelity reconstructions than either...
6262818 Method for simultaneous amplitude and quantitative phase contrast imaging by numerical reconstruction of digital holograms  
A method for the numerical reconstruction of digital holograms which allows simultaneously amplitude and quantitative phase contrast imaging. The reconstruction method computes the propagation of...
6185015 Compact planar optical correlator  
A planar optical correlator including at least first and second optical substrates (30, 32), through which light propagates by means of total internal reflection, at least first and second...
6163391 Method and apparatus for holographic data storage  
We disclose apparatus for holographic recording of information. The apparatus includes a lens or lens system, referred to here as the "FT lens," situated in such a way that light from an object...
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...
6122081 Using the Talbot Effect for lensless imaging of periodic structures in a holographic memory system  
A holographic memory system which utilizes the Talbot Effect for the lensless, near-field propagation of repeating image planes of periodic structures. Periodic phase structures at one plane in a...
6108110 Optical relay for pixel-based holographic storage and retrieval  
A holographic storage and retrieval system for use in co-propagating or counter-propagating geometries having a common optical relay for guiding a signal beam and a reference beam along a common...
6038073 Optical information processing system  
A constituent unit for an optical information processing system comprises an input information displaying device, which one-dimensionally, two-dimensionally, or three-dimensionally displays...
6008914 Laser transfer machining apparatus  
The laser transfer machining apparatus comprises a shaping unit for shaping the laser beam so that the laser beam has a beam pattern which corresponds to a desired pattern to be machined in the...
Matches 1 - 50 out of 243 1 2 3 4 5 >