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| Number | Title | Issue Date |
| 7864389 | Method of controlling optical amplifier located along an optical link The invention concerns shutting down and restarting optical amplifiers, such as Raman amplifiers, in an optical link, depending whether the optical amplifier is a transmitting side amplifier or a receiving side amplifier. For controlling the amplifiers, at least one... | 01/04/2011 |
| 7418170 | Optical device and virtual image display device A virtual image display device is provided which displays a two-dimensional image for viewing a virtual image in a magnified form by a virtual optical system. The virtual image display device includes an optical waveguide (13) to guide, by internal total refl... | 08/26/2008 |
| 7262889 | System and method for volume holographic imaging using spectral illumination A holographic imaging system is disclosed that includes a spectral electromagnetic field unit for providing a plurality of focal areas of a plurality of wavelengths of electromagnetic fields along a first direction, a lens system for directing the electromagnetic fi... | 08/28/2007 |
| 7181119 | Optically amplifying waveguide, optical amplifier module, and optical communication system An optically amplifying waveguide that can have a gain having a small wave-length dependency in a wavelength range shorter than the C-band, and the like. The optical amplifier module 1 optically amplifies a signal lightwave that has a wavelength lying in a wa... | 02/20/2007 |
| 7121668 | Device and method for generating an image for projection In an image projection device, interferences between the light source and the light modulator leading to visible interferences in the projected image are suppressed by an interference cancellation circuit that pre-corrects the control signal that includes the image ... | 10/17/2006 |
| 6944364 | Method and apparatus for regenerating optical signals in an all-optical cross-connect switch Methods, apparatus and systems for regenerating, monitoring and bridging optical signals through an optical cross-connect switch to provide increased reliability. A self testing method, apparatus and system for an optical cross-connect switch. An optical-to-electric... | 09/13/2005 |
| 6876473 | Device with anti-counterfeiting diffractive structure An optical device for security and anti-counterfeit applications comprises a diffractive structure comprising a discrete region that in response to white light illumination generates an image by a process of diffraction in close angular proximity to the specular ref... | 04/05/2005 |
| 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 recording medium having a shape of parallel flat plates, the signal light be... | 03/01/2005 |
| 6757085 | Image representation system and method for vehicles An imaging system for motor vehicles has a holographic screen, which scatters incident narrow band light at a predetermined solid angle, and a modulator and a lens to project images on the holographic screen. A holographic, transparent ray uniter, which allows broad... | 06/29/2004 |
| 6735001 | Image display apparatus An image display apparatus comprises a hologram screen 2 formed by bonding a hologram element 20 to light-transmissible films 21 and an illumination device 11 for irradiating image light 10 onto the hologram screen and reproducing ... | 05/11/2004 |
| 6728014 | Hologram recording film with additional information and recording method therefor A hologram recording film has a hologram image of an object recorded in a volume hologram photosensitive material by holographic duplication and further has a hologram image of an additional information pattern, e.g. a character or an image, recorded superimposedly ... | 04/27/2004 |
| 6707585 | Holographic recording and reproducing apparatus and holographic recording and reproducing method An apparatus includes recording reference optics, recording signal optics, and reproducing reference optics. The recording reference optics supplies a recording reference light beam to a recording medium, and the recording signal optics supplies a signal light beam,... | 03/16/2004 |
| 6674556 | Image reconstructing apparatus, hologram forming method, hologram and hologram sheet In an image reconstructing apparatus 10 for reconstructing a hologram, when a lid 11 is nearly upright in relation to an apparatus body 12, a light emitted from an illumination light source 15 is projected at a predetermined angle of incidence to a hologr... | 01/06/2004 |
| 6665100 | Autostereoscopic three dimensional display using holographic projection Large format, highly selective display screens can be formed from a plurality of holographic optical elements. In accordance with the teachings of the present invention, systems and methods are described to provide a holographic screen for display of stat... | 12/16/2003 |
| 6646771 | Method for producing holographic optical element comprising primary and complementary holograms and associated methods for establishing authenticity of element used as security device A method is provided for producing a holographic optical element that is comprised of at least one primary hologram (as defined herein) and at least one complementary hologram (as defined herein). The holographic optical element is useful as a security de... | 11/11/2003 |
| 6618174 | In-line holographic mask for micromachining An optically made, high-efficiency in-line holographic mask (ILHM) for in-line holographic patterning of a workpiece, and apparatus and methods for performing same. The ILHM combines the imaging function of a lens with the transmission properties of a sta... | 09/09/2003 |
| 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 a Fraunhofer diffraction region. The plates are arranged a... | 10/15/2002 |
| 6377370 | Optical display apparatus An optical display apparatus is provided that can utilize a low intensity point light source and that requires a small physical profile. The optical display apparatus comprises an image display apparatus including at least one point light source to form a... | 04/23/2002 |
| 6377238 | Holographic control arrangement Operator input into one or more devices to be controlled by the operator is provided through a holographic image of the keys or other input devices customarily actuated to provide input data to the system wherein actuation of the holographic image of the ... | 04/23/2002 |
| 6366368 | Method and apparatus for forming hologram The invention makes it possible to form a hologram for reproducing a three-dimensional image easily free of limitations placed by the size of the three-dimensional image to be reproduced, the size of the hologram and reference light for reproduction. A co... | 04/02/2002 |
| 6356685 | Gain control device in semiconductor optical amplifier using optical fiber grating The gain control device in a semiconductor optical amplifier using an optical fiber grating includes an input unit for receiving an optical signal, an output unit for outputting an amplified optical signal, and input and output optical isolators connected... | 03/12/2002 |
| 6351660 | Enhanced visualization of in-vivo breast biopsy location for medical documentation An image processing system and method visually documents and displays the in-vivo location from which a biopsy specimen was extracted, by processing pre-biopsy and post-biopsy images. A composite image is created which visually emphasizes differences betw... | 02/26/2002 |
| 6206748 | Simulated weapon using holographic images A simulated weapon is disclosed which uses a hologram, an electric lamp and various other optical components to produce holographic images resembling the rays or beams of ray guns or space guns as portrayed in motion pictures, television programs, video g... | 03/27/2001 |
| 6195184 | High-resolution large-field-of-view three-dimensional hologram display system and method thereof A real-time, dynamic, free space-virtual reality, 3-D image display system which is enabled by using a unique form of Aerogel as the primary display media. A preferred embodiment of this system comprises a 3-D mosaic topographic map which is displayed by ... | 02/27/2001 |
| 6175431 | Projection systems based on reconfigurable holographic optics A projection system and a method of displaying a projected input image on a projection screen of the system utilize one or more reconfigurable holographic optical elements (HOEs) to optically manipulate propagating light in the system. The reconfigurable ... | 01/16/2001 |
| 6169613 | Planar holographic optical device for beam expansion and display A holographic optical device includes a light transmissive substrate carrying first and second laternally separated holographic optical elements. The first holographic optical element diffracts incident light into the substrate where it is trapped by inte... | 01/02/2001 |
| 6122080 | Finder equipped with an indicator The invention relates to a space-saving yet high-quality real image type finder indicator wherein an optical member such as a hologram is used for a device for indicating various information in a finder. In a finder optical system has an objective system,... | 09/19/2000 |
| 6101008 | Autostereoscopic display based on electrically switchable holograms An autostereoscopic display system and a method of displaying a scene in a stereoscopic form on a screen of the system include two or more reconfigurable holographic optical element (HOE) stacks in the screen. The reconfigurable HOEs may be configured to ... | 08/08/2000 |
| 6095652 | Projection system A projection system incorporating a screen (2, 14) with a substantially achromatic response in a direction substantially perpendicular to the plane of the screen. The screen (2, 14) comprises a diffraction grating (4), means (5) for attenuating zero order... | 08/01/2000 |
| 6091521 | Light collection from diffractive displays A diffractive display system and a method of collecting first order light beams from a diffractive display of the system utilize holographic optical elements (HOEs) to deflect one of two first order diffracted light beams that emerge from each diffracting... | 07/18/2000 |
| 6061154 | System and method for steering focal plane data to access data locations in a holographic memory Systems and methods for steering a complex, spatially-modulated incident beam of coherent light to gain access to data locations in a holographic memory cell (HMC). One of the systems includes: (1) a reflective element, locatable proximate a first focal p... | 05/09/2000 |
| 6052220 | Optical amplifier and process for amplifying an optical signal propagating in a fiber optic employing an overlay waveguide and stimulated emission A side-polished fiber/overlay waveguide architecture and process for non-invasively implementing an optical amplifier are provided for an optical communications system. A "channel" overlay waveguide is employed to constrain for amplification optical energ... | 04/18/2000 |
| 6038042 | Apparatus and method for producing hologram and apparatus and method for displaying hologram Used as a propagation function is a half-plane propagation function which is restricted such that it has a value only within a half plane in a predetermined direction perpendicular to a propagating axis in a plane which is perpendicular to the propagating... | 03/14/2000 |
| 6005691 | High-security machine-readable holographic card The hologram card generates a hologram image in response to an illumination light beam. The hologram card comprises a substrate of a first plastic material having a first refractive index. The substrate has a contoured surface. The contoured surface is fo... | 12/21/1999 |
| 5989923 | Hologram containing sensor The invention relates to a sensor (9) comprising a hologram (17) supported on or within a holographic support medium (10). A species to be detected is reactive with a substance disposed throughout, the sensor (9). Optionally, a chemical reactive with a species... | 11/23/1999 |
| 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 input means for successively inputting different bits of int... | 11/16/1999 |
| 5889599 | Holography imaging apparatus holography display apparatus holography imaging method and holography display method A diaphragm having an aperture, the size of which is equal to or smaller than λf/p (λ is the wavelength, p is the imaging resolution, and f is the focal length of an imaging optical system) is arranged on the focal plane of the object space of the imagi... | 03/30/1999 |
| 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 spatially separate directions, a first and a second image of an ... | 03/23/1999 |
| 5825514 | Master hologram for the production of copy-proof holograms A method for the production of holograms proof against copying and imitation possessing authenticity features, which are copies of a master hologram. In accordance with the invention as a master hologram a hologram of a randomly structured optical element... | 10/20/1998 |
| 5805316 | Twin-image elimination apparatus and method The twin-image elimination apparatus of the present invention comprises (a) a scanning light source for emitting a scanning light beam; (b) an interference device which converts the scanning light beam from the scanning light source into a spherical wave ... | 09/08/1998 |
