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| Number | Title | Issue Date |
| 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 technique controls the bias electric field applied to a photorefractiv... | 07/05/2011 |
| 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 curable material is physically contacted with the surface relief pattern o... | 09/30/2008 |
| 7339710 | Holographic recording medium, holographic reading system, and data reading method from the holographic recording medium A holographic disc recording medium records a hologram over the entire holographic disc recording medium by using a conical reference beam for recording. A hologram recorded image includes recorded images of a plurality of data pages including a plurality of pixels ... | 03/04/2008 |
| 7326500 | Sensitization of photo-thermo-refractive glass to visible radiation by two-step illumination Photo-thermo-refractive (PTR) glass is a multi-component silicate glass having photosensitivity in rear UV region. A novel process is disclosed for PTR glass sensitization to visible region by means of two-step illumination followed by thermal development. This disc... | 02/05/2008 |
| 7312907 | Hologram apparatus and hologram recording and playback method A hologram recording and playback method comprises establishing in advance a test region adapted to record a piece of test data for each of a reference incidence angle and a plurality of stepped incidence angles of a recording reference beam in a recording medium, s... | 12/25/2007 |
| 7310173 | Hologram recording method, hologram recording reproduction method, hologram recording device, hologram recording/reproduction device and hologram reproduction device In the hologram recording and hologram-record reproduction using a one-dimensional optical modulator, the one-dimensional optical modulator where a plurality of light-modulating pixels are arranged modulates a laser beam to record a digital-data signal on a hologram... | 12/18/2007 |
| 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 plurality of sets of mirror elements. Each one of the mirror elements of th... | 11/20/2007 |
| 7295200 | Computer generated hologram display system A method of displaying a computer generated hologram includes displaying the image as a set of facets that approximated to the true shape of the object to be displayed. Each of these facets is populated with points that together make up the image. The invention prov... | 11/13/2007 |
| 7273683 | Fiber optic devices having volume bragg grating elements Fiber optic devices including volume Bragg grating (VBG) elements are disclosed. A fiber optic device may include one or more optical inputs, one or more VBG elements, and one or more optical receivers. Methods for manufacturing VBG elements and for controlling filt... | 09/25/2007 |
| 7256766 | Electrophoretic display comprising optical biasing element The invention features an electrophoretic display element. The display element includes an electrophoretic display medium, an optical biasing element to modify an optical characteristic of the electrophoretic display element, and an addressing electrode to address t... | 08/14/2007 |
| 7254105 | Method and apparatus for diffractive information storage A petabyte diffractive storage system stores information on a diffractive storage tape. A light component generates a large reference beam to cover the plurality of points of the diffractive storage tape so as to simultaneously interfere with the plurality of object... | 08/07/2007 |
| 7251066 | 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. One or more liquid crystal beam steering spatial light modulators (B... | 07/31/2007 |
| 7248618 | Systems and methods for second harmonic generation using three-dimensional Bragg grating elements Apparatus and methods for altering one or more spectral, spatial, or temporal characteristics of a light-emitting device are disclosed. Generally, such apparatus may include a volume Bragg grating (VBG) element that receives input light generated by a light-emitting... | 07/24/2007 |
| 7248617 | Use of volume bragg gratings for the conditioning of laser emission characteristics Apparatus and methods for altering one or more spectral, spatial, or temporal characteristics of a light-emitting device are disclosed. Generally, such apparatus may include a volume Bragg grating (VBG) element that receives input light generated by a light-emitting... | 07/24/2007 |
| 7236277 | Holographic recording medium and holographic recording method using the same A holographic recording medium has at least a recording layer with a thickness of L which comprises a recording layer material having an absorption coefficient of α and containing a photorefractive material, wherein the optical density αL represented by the produc... | 06/26/2007 |
| 7218597 | Holographic recording method In the disclosed holographic recording method, when multiplex recording of data of a plurality of pages is performed, exposure time of a hologram of a final page to be recorded is fixed irrespective of a degree of multiplicity while an exposure time of each page is ... | 05/15/2007 |
| 7187481 | System and method for providing gain and thresholding to a holographic data parallel recording and replication system incorporating independent angular address assignment System and method for providing gain and thresholding to a holographic data parallel recording and replication system incorporating independent angular address assignment. A plurality of information bearing light beams in an information bearing light beam arm of a d... | 03/06/2007 |
| 7177550 | On-axis laser receiver wavelength demultiplexer with integral immersion lensed detectors The present invention is directed to a laser communication receiver for wireless optical communication. A laser communication receiver includes a diffractive optical element to permit detectors at different spatial locations to detect different wavelengths of the op... | 02/13/2007 |
| 7164429 | Signal conversion system A method comprising performing white component replacement on a first image signal received by a display device to generate a second image signal, applying a skew-sigmoid opto-electronic transfer function to the second image signal to generate a third image signal, ... | 01/16/2007 |
| 7161723 | Scheme capable of providing gain and thresholding to the parallel recording and replication of holographic media A system and method capable of providing high data rate data copying and recording in holographic data storage while maintaining the copied data's signal-to-noise ratio. This is achieved by using optically-based parallel signal processing. In one preferred embodimen... | 01/09/2007 |
| 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. One or more liquid crystal beam steering spatial light modulators (B... | 12/12/2006 |
| 7136206 | 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 imprinted into a filter material, such as Lithium Niobate. In another embodiment, the filter comprises a ba... | 11/14/2006 |
| 7132636 | Imaging system and methodology employing reciprocal space optical design An imaging system and methodology is provided to facilitate optical imaging performance. The system includes a sensor having one or more receptors and an image transfer medium to scale the sensor and receptors to an object field of view. A computer, memory, and/or d... | 11/07/2006 |
| 7130092 | Apparatus and method for recording and reproducing optical information An optical information recording/reproducing apparatus generates information light by modulating light emitted by a light source device with a light modulator depending on the information to be recorded and generates reference light for recording by modulating the l... | 10/31/2006 |
| 7126730 | Electro-holographic lens An electro-holographic lens device comprising: an active layer made from a transparent photo-refractive material, whose refractive index may be locally modified by locally applying an electric field; an array of electrodes in a predetermined density, provided adjace... | 10/24/2006 |
| 7125632 | Fiber optic devices having volume Bragg grating elements Fiber optic devices including volume Bragg grating (VBG) elements are disclosed. A fiber optic device may include one or more optical inputs, one or more VBG elements, and one or more optical receivers. Methods for manufacturing VBG elements and for controlling filt... | 10/24/2006 |
| 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 holographic medium, providing a tunable blue-violet laser for wavele... | 10/17/2006 |
| 7119941 | Input output matching in optical processing The invention relates to determining a matching between discrete optical elements, such as an SLM and a CCD, and continuous optical systems, subsystems and/or elements, such as Fourier lens and individual lenslet of lenslet arrays. Exemplary processing performed by ... | 10/10/2006 |
| 7095536 | 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 transparent layer; and a holographic recording layer formed on the light illum... | 08/22/2006 |
| 7085025 | Apparatus for recording optical information Optical information is stored in an optical information recording medium having an information recording layer utilizing holography with an optical information recording apparatus which includes security features. An input device is used to input individual informat... | 08/01/2006 |
| 7085203 | Optical head with defocusing correction and spherical aberration correction An optical head with excellent optical characteristics even when using a light source that substantially has a wavelength broadening is provided. The optical head includes a light source, an objective lens for focusing a light beam emitted from the light source on a... | 08/01/2006 |
| 7072591 | Processing of multiple wavelength signals transmitted through free space The present invention is directed to a laser communication receiver for wireless optical communication. A laser communication receiver includes a diffractive optical element to permit detectors at different spatial locations to detect different wavelengths of the op... | 07/04/2006 |
| 7061852 | Recording apparatus for a holographic recording medium including an alignment laser having a different wavelength from the recording laser A recording apparatus for holographic recording medium having an alignment mark and designed to irradiate a recording light beam onto a recording region of holographic recording medium to record information as a hologram. This apparatus comprises a recording laser r... | 06/13/2006 |
| 7058306 | Asymmetrical laser communication transceiver configuration The present invention is directed to a laser communication transmitter and receiver for wireless optical communication. The laser communication transmitter uses a small diameter so correspondingly divergent beam to provide improved bit error rates. A laser communica... | 06/06/2006 |
| 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 second material an optically variable effect. ... | 05/30/2006 |
| 7050169 | Method of measuring a physical function using a composite function which includes the physical function and an arbitrary reference function A method for measuring a physical function forms a symmetric composite function by combining the physical function with a reference function. The method obtains a Fourier transform of the symmetric composite function. The method calculates an inverse Fourier transfo... | 05/23/2006 |
| 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 portion having a thickness less than approximately 2 millimeters. A holo... | 04/25/2006 |
| 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 transparent layer; and a holographic recording layer formed on the light illum... | 04/18/2006 |
| 7031573 | Fiber optic devices having volume Bragg grating elements Fiber optic devices including volume Bragg grating (VBG) elements are disclosed. A fiber optic device may include one or more optical inputs, one or more VBG elements, and one or more optical receivers. Methods for manufacturing VBG elements and for controlling filt... | 04/18/2006 |
| 7027190 | Image-processing apparatus, image-processing method and recording medium In an image-processing apparatus, a digital image signal is stored in a memory, and a memory access control part entirely manages all accesses to the memory with respect to the digital image signal. An image processing part converts the digital image signal stored i... | 04/11/2006 |
