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6639700 |
Hologram recording medium, hologram recording/reconstructing apparatus, and hologram recording/reconstructing method
A hologram recording medium comprises a hologram recording layer for recording a hologram, and a wedge substrate for varying the propagating direction of a reference light and an object light...
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6631016 |
Full-parallax holographic stereograms on curved substrates
The current invention comprises the recording of full parallax, one-step, full color holographic stereograms so as to properly display the resultant imagery when the hologram is mounted on a curved...
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6545778 |
Holographic display device and method for producing a transmission diffusion hologram suitable for it
A holographic display device, e.g. for a vehicle, which reduces a color of hologram reflection toward the outside of the vehicle or a color of hologram transmission toward the inside of the vehicle...
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6413702 |
Method for making a holographic linear position encoder
A method for fabricating an error-free linear position encoder incorporates the generation of fringes on a holographic plate by the interference of light from two point sources. The fringes are...
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6329105 |
Pattern formation method and apparatus using atomic beam holography technology
A pattern formation method wherein a very small pattern composed of a desired element (atoms) is formed directly on a substrate by using atomic beam hologram technology. Quantum coherent reflection...
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6307679 |
Formation of a refractive index grating
An apodised refractive index grating is recorded in a photosensitive optical fiber by forming first and second component interference patterns with different pitches, that are recorded in the...
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6101009 |
Holographic data storage and/or retrieval apparatus having a spherical recording medium
A holographic data storage and/or retrieval apparatus having a spherical holographic recording medium and addressing means for rotating the recording medium to selectively expose the recording...
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6049401 |
Volume holographic memory
A volume holographic memory whose three-dimensional photosensitive body has exposed portions comprised only of continuous faces prevents recording of noise caused by scattered light at the time of...
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5949557 |
Total internal reflection holography method and apparatus for lithography on 3-D spherical shaped integrated circuit
A photolithograhic method and apparatus for exposure of a spherical shaped semiconductor substrate according to a mask pattern of a primary spherical object mask in the manufacture of a spherical...
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5764390 |
Holographic method for generating three dimensional conformal photo-lithographic masks
A three-dimensional photo mask is formed from a substrate having a first side and a three-dimensional side. A hologram is provided on the first side of the substrate. The three-dimensional side of...
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5712715 |
Optical transmission system with spatially-varying Bragg reflector
An optical transmission system having a transmission waveguide, an optical amplifier, a pump radiation source for supplying pump radiation to the optical amplifier, and a Bragg grating for...
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5594559 |
Stereoscopic display apparatus
A space light modulating apparatus and a stereoscopic display apparatus which are used in a rewritable hologram stereoscopic display. A solid image can be properly displayed by a phase distribution...
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5576853 |
Apparatus and methods for making transmission holograms
Apparatus and methods are provided for mass production of transmission holograms onto a continuous web of photosensitive material, one method involving the mounting of a master transmission...
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5539544 |
Holographic filter for protection from radiation, notably laser radiation
A holographic filter for protection from radiation, notably laser radiation. At least one support is covered with at least two holograms. Each hologram is constituted by a stack of strata. The...
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5499117 |
Transfer of photopolymer hologram from a curve surface to another curve surface
A method for transferring a photopolymer hologram from a curved exposure surface to a curved application surface including the steps of forming a release layer on the exposure surface, forming a...
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5477348 |
Achromatic hologram optical system
An achromatic hologram optical system for converting a wave front A into a wave front B. Two holograms (H 1 and H 2 ) are provided. The length of an optical path from an equiphase front of the...
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5452385 |
Optical scanning device an optical scanning type display and an image data input/output device
An optical scanning device comprises a light source for emitting a light, a light guide path being adapted to receive the emitted light and to transmitting the received light therein, a plurality...
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5422746 |
Single and multiple element holographic devices for high-efficiency beam correction
The holographic element of the present invention includes a holographic grating pattern that is impressed in the media of the element utilizing beams of electromagnetic energy of wavelength λ o ....
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5331443 |
Laser engraved verification hologram and associated methods
A method for increasing the authentication effect of a verification hologram to be affixed to a protected document includes laser etching individualized indicia into the reflective layer of each...
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5330264 |
Method and apparatus for copying and manufacturing hologram plate
A hologram plate manufacturing apparatus comprising a copying optical element disposed in opposed relation to a photosensitive surface of a hologram plate. The copying optical element is arranged...
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5223955 |
Reflection integral holography
Apparatus and method for storing holographic synthesized information for reflection integral Bragg holograms, free of the limitations of dispersing elements (such as unilateral diffusing screens,...
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5198914 |
Automatic constant wavelength holographic exposure system
A hologram exposure system that includes a spherically curved mirror surface positioned adjacent a substrate/hologram assembly that includes a spherically curved hologram recording layer supported...
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5103323 |
Multi-layer holographic notch filter
A holographic member for a helmet visor comprising a first holographic layer having planes of diffraction oriented in a first direction in a given local area is disclosed. A second holographic...
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5044708 |
Wide visual field hologram
Process for producing a hologram reproducing the image of at least one object. Said process is characterized in that a first recording is made of the image of said object on at least one first...
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4995025 |
Spherical pivoting actuator for read/record head
A low cost, low power, lightweight, low audible noise, high speed actuator for a read and/or record implement or portion thereof attached in a structure with a free end which is movable in multiple...
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4888260 |
Volume phase reflection holograms and methods for fabricating them
A hologram is fabricated by opening a volume phase reflection hologram formed in a recording medium such as a positive photoresist. The opening occurs by forming a second hologram, such as an...
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4863225 |
Reflection holograms formed by scanning
A method of producing a reflection hologram wherein light from a source (29) is directed onto the hologram recording medium (23) via a lens (21) which causes light reaching the medium (23) to pass...
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4834476 |
Real image holographic stereograms
Methods and devices for recording and projecting holographic stereograms are disclosed. In one aspect of the invention, a concave semi-cylindrical ("alcove") display system is disclosed in which an...
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4834474 |
Optical systems using volume holographic elements to provide arbitrary space-time characteristics, including frequency-and/or spatially-dependent delay lines, chirped pulse compressors, pulse hirpers, pulse shapers, and laser resonators
Optical systems, using volume holographic elements (gratings) having geometries which tailor the spatio-temporal dispersion of the optical pulses for the system. The input optical pulse is...
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4832424 |
White-light viewable, cylindrical holograms and method of spatially filtering wavefronts
A white-light viewable, cylindrical hologram is made by recording on a cylindrical recording medium the interference between a radial reference beam and an object wavefront emanating from the...
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4786125 |
Ocular protective apparatus
A laser shield (FIG. 3) for providing ocular protection against laser hazards, while still providing high photopic or scotopic transmittance and good color discrimination is disclosed. This laser...
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4707054 |
Apparatus and method for making a reflection hologram
A method and apparatus for making reflection holograms wherein a film (27) of light sensitive material in which the hologram is to be formed is rotated about a first axis (Y--Y) which is itself...
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4563024 |
Hologram identification device
An identification device in the form of a security card or anti-counterfeiting label which comprises a hologram visible by reflection in incident natural light, the film emulsion having been...
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4458977 |
Systems for forming improved reflection holograms with a single beam
A hologram forming system for forming, from a single beam source and a reflective mirror, a reflective hologram in which spurious reflection and transmission hologram recordings are eliminated....
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4390234 |
Viewer/projector for display of 360 degree holographic film cassettes
A combined viewer and projector for display of holographic films prerecorded in cylindrical configuration at prespecified nominal radius of curvature. The projector and the viewer sections of the...
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4339168 |
Holograms created from cylindrical hologram masters
A method of constructing cylindrical holograms in which the image space is the entire space within the cylinder, and a method of constructing holograms on surfaces of other shapes, such as flat...
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4017144 |
Recording assembly for volume holography
A solid cylindrical recording medium is axially rotatable within a cavity in a transparent block, the medium and the cavity being complementary in shape. The medium and the block have substantially...
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3991486 |
Aircraft landing signal officer trainer
A landing signal officer trainer having a cylindrically rolled holographic ilm with stored attitude data of yaw and pitch rotatably and slidably mounted in conjunction and relation to a laser beam...
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3958860 |
Holographic object recognition trainer
Apparatus and method for the visual display of an object, such as an aircraft, at continuously variable attitudes comprising two hologram films of the object made in wrap-around 360° fashion on...
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3951509 |
Apparatus for deflecting light and scanning line conversion system
A method and apparatus for deflecting a light beam having high resolution, good linearity with time and high frequency response. For deflecting a light beam, after a monochromatic light beam is...
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3940204 |
Optical display systems utilizing holographic lenses
This invention is applicable to display systems, such as in a helmet mounted display or a head-up display, utilizing a holographic lens operating at a relatively large off-axis angle in order to...
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3883216 |
Holographic memory having spherical recording medium
In a holographic memory, a substantially constant angle is maintained between the object beam and the reference beam at the memory medium. The object beam is pivoted about an object beam pivot...
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3842197 |
FLEXIBLE HOLOGRAPHIC RECORD DISC REPRODUCING SYSTEM
A flexible disc is provided on at least one face of which an image is recorded along a spiral track in heliographic form. Under the action of a monochromatic light beam this image is obtained as a...
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3832565 |
HOLOGRAPHIC MEMORY WITH DODECAHEDRON DETECTOR MATRIX
A device for retrieving information stored in the form of sub-holograms on a storage medium comprising a light source, means for holding the storage medium and a detector matrix characterized by...
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3807829 |
EXTENDED-FIELD HOLOGRAPHIC LENS ARRAYS
Multiple holographic lenses are provided in the same structure by recording in a spatial array the interference patterns of coherent reference and object beams from pairs of point sources to...
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3784276 |
HOLOGRAPHIC APPARATUS FOR LARGE FIELD OF VIEW
A holographic apparatus permitting holographing of an object in transmission to provide a viewing angle which may be as large as substantially 180°. The apparatus is particularly suitable for...
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3737878 |
HOLOGRAPHIC READ/WRITE STORAGE SYSTEM
The invention relates to a holographic mass data storage system in which coded representations of data are recorded on the photosensitive surface of a drum sequentially under control of mechanical...
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3737212 |
DIFFRACTION OPTICS HEAD UP DISPLAY
A head up display for combining a direct view as for example that of an aircraft pilot with superimposed light from another source by use of diffraction optics as a combining and collimating...
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3720453 |
DIFFERENTIAL READOUT HOLOGRAPHIC MEMORY
A holographic optical memory utilizes a differential technique to significantly increase the signal-to-noise ratio during the readout stage of operation.
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3700302 |
VACUUM FILM HOLDER FOR HOLOGRAMS
A movement proof film holder for making holograms is made by forming a vam chamber between the walls of two darkened open-ended concentric cylinders. The perforated walls of the inner cylinder are...
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