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7443553 |
Holographic sensors and their production
An array of discrete sensors disposed on a substrate, each sensor comprising a holographic support medium and a hologram disposed throughout the volume of the medium, whereby interaction with an...
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7424185 |
Stretching and compression of laser pulses by means of high efficiency volume diffractive gratings with variable periods in photo-thermo-refractive glass
High efficiency reflective volume Bragg gratings with chirped gratings recorded in photo-thermo-refractive glass having an absolute diffraction efficiency exceeding 95% in transmitting and...
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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...
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7307769 |
Hologram recording medium, recording/reproducing method and recording/reproducing apparatus
A hologram recording medium is for recording or reproducing information with light irradiated thereto. The medium has a recording layer made of a photo-sensitive material, a reflective layer...
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7301683 |
Hologram and holographic viewing device incorporating it
The invention relates to a hologram that enables two or more different images to be simultaneously reconstructed even in a state where the hologram is fixed in terms of relative position with...
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7277211 |
Hologram recording and reproduction apparatus, hologram recording and reproduction method and hologram recording medium
An apparatus and method is disclosed wherein, even if the multiplicity in multiplexing of recording data is increased, positioning of data upon reproduction can be performed with a high degree of...
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7271944 |
Electro-optical device and electronic apparatus having the same
An electro-optical device includes: a first optical panel having a pair of substrates with an electro-optical material interposed therebetween; a second optical panel that has a pair of substrates...
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7262893 |
Data read/write device for holographic WORM and method thereof
A data writing and reading device is capable of writing and reading data with respect to a holographic storage medium. The data writing and reading device includes a light source which emits a...
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7259899 |
Narrow angle hologram device and method of manufacturing same
A method of manufacturing a master for producing a hologram device. A first master is produced with a compensating angle. The second master is produced from the first master with an index matching...
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7245408 |
Systems and methods for producing wide field-of-view holographic displays
Hologram recording devices and techniques can be employed to produce wide-field-of-view holograms. In one embodiment, a specialized lens is used to couple an object beam into a holographic...
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7244532 |
Holographic recording medium
A holographic recording medium includes a holographic recording carrier including a first light transmittable substrate, a second light transmittable substrate and a holographic recording layer...
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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...
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7229720 |
Hologram film having identification information recorded thereon and method for manufacturing the same
A simplified method is provided for recording identification information, such as a serial number or the like, in a hologram-recorded film simultaneously with hologram duplication. The method...
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7193757 |
Angle multiplexing holographic storage device and method
In an angle multiplexing holographic storage device, a movable beam splitter is used for splitting a source beam into an object beam and a reference beam. An encoding device is used for encoding...
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7184183 |
Hologram recording/reproducing apparatus and hologram recording/reproducing method
This invention provides a hologram recording apparatus for recording an interference fringe, generated by interference of a first light beam subjected to spatial light modulation by recording data...
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7167286 |
Polytopic multiplex holography
Disclosed is a multiplexing method and apparatus that allows holograms to be spatially multiplexed with partial spatial overlap between neighboring stacks of holograms. Each individual stack can...
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7149015 |
Obliquity correction scanning using a prism mirror
Disclosed are optical systems and methods of producing obliquity corrected light beams, for example, holographic recording and retrieval systems that utilize an obliquity corrected reference beam....
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7095539 |
Method of forming a three-dimensional orthoscopic image from its pseudoscopic image
A method of forming a three-dimensional orthoscopic image from a pseudoscopic image comprising preparing an integral photograph representing the pseudoscopic image, and reconstructing a...
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7092133 |
Polytopic multiplex holography
Disclosed is a multiplexing method and apparatus that allows holograms to be spatially multiplexed with partial spatial overlap between neighboring stacks of holograms. Each individual stack can...
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7046406 |
Hologram plate and its fabrication process
The invention provides a hologram plate which is used with the double-focus replication process, and which is integrated with a spacer to impart marring resistance thereto, and is integrated with a...
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6970292 |
Beam shaping element for use in a lithographic system
A beam homogenizer that minimizes undesired intensity variations at the output plane caused by sharp breaks between facets in previous embodiments. The homogenizer includes a hologram made up of...
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6859293 |
Active digital hologram display
Certain types of holographic recording materials can be used to updateably record holographic stereograms formed when fringe patterns are generated through interference of an object laser beam...
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6852452 |
Method of fabricating hologram screen and hologram imaging apparatus
A method of fabricating a hologram screen having a large visual range and a hologram imaging apparatus used for the particular method of fabricating the hologram screen are disclosed. A plurality...
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6847485 |
Beam shaping element for use in a lithographic system
A beam homogenizer that minimizes undesired intensity variations at the output plane caused by sharp breaks between facets in previous embodiments. The homogenizer includes a hologram made up of...
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6842272 |
Hologram plate and its fabrication process
The invention provides a hologram plate which is used with the double-focus replication process, and which is integrated with a spacer to impart marring resistance thereto, and is integrated with a...
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6816291 |
Optical information recording and reproducing apparatus having volume holographic memory
A description is provided of an optical information recording and reproducing apparatus. The apparatus comprises: a holographic memory made of a photorefractive crystalline material; a support...
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6788443 |
Associative write verify
Associative retrieval techniques of this invention allow a holographic recording device to simultaneously query a plurality of storage locations for the presence of a given data pattern. The...
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6781725 |
Confocal holographic optical storage with non-overlapping records
The present invention relates to a method and a system for the storage of data in the form of volume holograms which do not mutually overlap. The storage medium consists of a high-sensitive...
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6757086 |
Hologram forming apparatus and method, and hologram
The image data generator 1 produces image data for recording into a holographic stereogram. The image data generator 1 combines a stereo image model being at least a part of a three-dimensional...
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6735002 |
Method for formatting partially overlapping holograms
A method of writing holograms includes: numbering sections in sequence, where each section has a spatial projection onto a holographic medium; and writing at least one hologram in each of the...
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6721076 |
System and method for reflective holographic storage with associated multiplexing techniques
A method and system of recording successive holograms in a recording medium including a reflective substrate layer, a polarization shifting layer, and a photorecording medium layer is presented. A...
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6714329 |
Hologram plate and its fabrication process
The invention provides a hologram plate which is used with the double-focus replication process, and which is integrated with a spacer to impart marring resistance thereto, and is integrated with a...
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6674554 |
Apparatus for making holograms including images of particular sizes
A method and apparatus for making holograms includes a technique for exposing a film substrate or other light-sensitive medium to consecutive two dimensional images, together representative of a...
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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...
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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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6614566 |
Process for holography involving skip-sorted hologram storage
The invention relates to a skip-sorted spatial multiplexing holographic storage technique that addresses the problems of cross-talk, image distortions, and physical change of the medium encountered...
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6613481 |
Hologram film having identification information recorded thereon and method for manufacturing the same
A simplified method is provided for recording identification information, such as a serial number or the like, in a hologram-recorded film simultaneously with hologram duplication. The method...
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6567193 |
Hologram production technique
A system for forming holographic pixels on the surface of a workpiece is disclosed. The system comprises a laser generating a laser beam; a beam splitter dividing the laser beam into a first beam...
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6542264 |
Electro-holographic optical switch
The present invention relates to an optical switch comprising a paraelectric photorefractive material, storing a hologram, possibly a latent hologram, whose reconstruction, or activation and...
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6529297 |
Color hologram recording medium and process for fabricating the same
A color hologram recording medium 2 includes volume hologram recording mediums 14 R, 14 G and 14 B for diffracting light of wavelengths different from each other. Reconstruction patterns 1 R,...
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6452699 |
Controlled diffraction efficiency far field viewing devices
This invention pertains to the design of optimized far field viewing devices that simultaneously produce bright far field holographic light patterns and achieve good see-through performance to...
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6436584 |
Image-recording medium, method for forming image-recording medium, method and apparatus for reading data
There is described an image-recording medium and an image-reading method, which make it possible to improve reading accuracy of information by avoiding duplication of an optical variable image with...
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6404519 |
Method of advertising on a motor vehicle
A method of advertising on a motor vehicle having a substantially transparent window including steps of providing a holographic film with a holographic image, and adhering the holographic film to...
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6396635 |
Beam shaping element for use in a lithographic system
A beam homogenizer that minimizes undesired intensity variations at the output plane caused by sharp breaks between facets in previous embodiments. The homogenizer includes a hologram made up of...
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6392768 |
Dot matrix hologram with a hidden image
A dot matrix hologram with a hidden image is disclosed, wherein the hidden image technology is applied to a dot matrix hologram. Although the hidden image technology has been used in a conventional...
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6388780 |
Hologram production technique
Apparatus for producing dot matrix holograms through laser ablation utilizing only two two-axis, low-inertia beam deflectors to control the maximum holographic direction, and the holographic...
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6369919 |
Holographic security device
A holographic security device comprising first and second holographic generating structures ( 2,3 ) recorded in respective sets of substantially non-overlapping regions of a record medium is...
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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...
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6340540 |
Hologram recording sheet holographic optical element using said sheet and its production process
The hologram recording sheet according to the invention is made up of a base film and hologram sensitive materials sensitive to different wavelength regions formed therein in a desired pattern, or...
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6330087 |
Hologram device and method for producing the same
A hologram of an increased size using a single color laser, capable of executing a full color regeneration in a desired view angle and a method for producing the hologram. A plurality of...
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