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4960314 |
Diffraction optics diffusing screen laminate for full color on-axis viewing
An optical screen module for full-color, on axis viewing is described. The module has a transmission holographic optical element, a louver filter, and a diffraction optics diffusion screen. Input...
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4958892 |
Diffraction coherence filter
A diffraction coherence filter based on Bragg interference principles comprises a plurality of spaced-apart lower-hierarchy optical elements, containing a series of interference structures, which...
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4955694 |
Process for producing HOE's for use in combination to produce a telecentric beam
A light beam is repeatedly deflected in the longitudinal direction through a holographic element HOE by means of a rotating multi-faceted mirror. This HOE is so formed that the beam entering at...
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4953954 |
Phase-conjugate communication using mutually incoherent laser beams
A phase-conjugate optical communication system includes a first source of coherent radiation for producing a first beam having a nominal wavelength λ and a first modulator for temporally...
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4946253 |
Reconfigurable substrate-mode holographic interconnect apparatus and method
The present invention discloses a reconfigurable optical interconnect apptus that redirects an optical beam through embedded holographic elements of a substrate-mode hologram to connecting...
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4945529 |
Optical head comprising a diffraction grating for directing two or more diffracted beams to optical detectors
For use in combination with an optical source for generating a coherent beam along a main optical axis, an optical head device comprises a diffraction grating having a plurality of grating regions...
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4942102 |
Holographic optical elements having a reflection hologram formed in a photopolymer
Improved holographic optical elements are disclosed that contain a reflection hologram. Also, an improved process for forming reflection hologram.
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4938550 |
Holographic deflection device
A holographic deflection device having a tunable laser, and at least one hologram for deflecting light incident thereupon from the tunable laser, so that the deflection of the light can be...
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4930847 |
Multicolor holographic element and apparatus for head-up display applications
A method for producing multicolor holographic optical elements useful in presentation of multicolor holographic images in a head-up display (HUD) system. Because of restricted geometries, such HUDs...
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4930868 |
Combiner for optical or electro-optical systems
A beam splitter combining the optical apertures of at least three optical (or electro-optical) devices to one optical aperture with respect to a beam of electromagnetic radiation passing...
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4929044 |
Optical pickup using waveguide
An optical pickup comprises at least a semiconductor laser, a waveguide optically coupled with the semiconductor laser for propagating therein a light from the semiconductor to guide it to a...
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4928282 |
Laser generator with phase mode-locking
The laser generator includes a device for phase-locking the mode of the laser generator, the device being placed between the amplifying active medium (3) and the rear reflecting mirror (1) and...
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4921333 |
Phase contrast image microscopy using optical phase conjugation in a hybrid analog/digital design
A method for producing an intensity contrast image from phase detail in a transparent phase object also removes spurious background artifacts and speckle from the light source resulting in clearer...
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4919511 |
Fibre-type light conversion device
A fibre-type light conversion device for converting the wavelength of an incident light. According to the first feature of the invention the device has a structure in which a holographic element...
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4907851 |
Single-mode 1×N holographic fiber optics coupler
A holographic 1×N single-mode fiber optics coupler for coupling a single-mode monochromatic fiber optics input to N single-mode fiber optics outputs. A hologram of the output fiber bundle or the...
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4902100 |
Method and apparatus for removing phase aberrations in windows using broadband phase conjugation
A method and apparatus are disclosed for correcting complex phase aberrations in a thick window in an airborne vehicle using the technique of phase conjunction. A conjugate element of the window is...
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H000738 |
Switched holograms for reconfigurable optical interconnect
A device that provides reconfigurable optical interconnections of multiple ata channels that have applications in highly parallel computers. The device utilizes an array of optical switches which...
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4892369 |
Holographic rear window stoplight
An improved holographic rear window stoplight is provided and includes a hologram member laminated to the rear window surface. Single or multiple hologram layers may be provided. The hologram...
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4878718 |
Method for holographic correction of beams of coherent light
A method for producing desired changes in a beam of coherent light radiating at λ 1 , comprising the steps of (a) splitting a beam of coherent light radiating at λ 1 , correcting one of the beams...
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4879167 |
Real time holographic filter using nonlinear optical materials
The present invention is an adaptive laser protection device which adaptively forms a reflection holographic optical element to reflect away incident laser radiation. The laser protection device...
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4874214 |
Clear holographic helmet visor and process of producing same
The visor can be readily mounted on a helmet by virtue of the fact that it dispenses with the need for any optical relay system. Provision is made for a light image generator, an optical combining...
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4863224 |
Solar concentrator and manufacturing method therefor
A solar concentrator comprises a prism having radiation input, reflection and output faces. Located on the input and/or reflection face(s) is a layer of material with a formed three-dimensional...
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4854674 |
Process for improving holographic efficiency
A layer of material having relatively low light sensitivity is interposed between a substrate and a light sensitive recording medium during recording of a slant fringe hologram. The layer frees the...
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4854662 |
Optical data signal apparatus for optically coupling a plurality of data channels between stationary and rotating systems
Disclosed is optical data signal apparatus for optically coupling a plurality of data channels between stationary and rotating systems. The optical data signal apparatus is useful in a rotary head...
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4850662 |
HOE and indirect method of constructing same
A HOE for use in a wavelength λ 3 is made by recording a holographic corrector plate at a wavelength of λ 1 . The HOE is then recorded at a wavelength λ 2 . Aberration caused by differences...
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4842396 |
Light modulation element and light modulation apparatus
A light modulation element of the invention has a plurality of polygonal modulation portions for modulating incident light staggered on arrays. Sides, of each two adjacent portions on different...
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4842389 |
Vehicle display system using a holographic windshield prepared to withstand lamination process
A holographic windshield (10) includes an inner glass ply (36) having an inner flexible optically transparent inner interlayer (42) overlaid upon its inner surface (40). A middle flexible...
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4838630 |
Holographic planar optical interconnect
An optical interconnect employing planar volume Bragg hologram technology in two dimensions comprises a dichromated gelatin planar volume Bragg hologram disposed in a glass planar optical path....
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4837425 |
Security arrangement
A security arrangement includes a token in the form of a thin lamina which co-operates with a receptor. The token includes an optically readable pattern in the form of a bar code, and a thin film...
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4836629 |
Device to control a light beam in a wide angle field and application to a sensing device
The device to control the direction of a light beam comprises mainly the following elements substantially aligned in the direction of a laser beam emitted by a source: a low-deflection, controlled...
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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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4832427 |
Holographic display system
A display source emits light. A first hologram receives the light from the display source and diffracts the received light. The light from the display source is applied to the first hologram at an...
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4830442 |
Off-axis holographic instrument illuminator
A converter hologram providing radially symmetric exposure of coaxially located holograms from an off-axis source and displays utilizing the same.
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4830441 |
Holographic filter construction for protective eyewear
The present invention is a manner of constructing holographic optical elements for use in laser eye protection. A photosensitive layer, preferably formed of dichromated gelatin, is disposed on a...
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4830464 |
Wide field high optical efficiency display device
A display device with wide field and high optical efficiency is provided including an optical assembly having a spherical holographic mirror used on the axis and a semitransparent mirror. A...
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4824193 |
Holographic multiplexer/demultiplexer and its manufacturing method
A holographic multiplexer and holographic demultiplexer, which has a diffraction grating formed of a hologram with an interference pattern produced by interference of two wave fronts, of which at...
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4818045 |
Holographic optical element having periphery with gradually decreasing diffraction efficiency and method of construction
The present invention is a technique for fabrication of a holographic optical element combiner having a high diffraction efficiency at a central portion and gradually decreasing diffraction...
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4809340 |
Optical correlation system
Invention provides optical correlation apparatus comprised of optical means producing a light image of the mailpiece including the address information, holographic filter means receiving the...
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4807212 |
Correcting for comatic aberration in an optical head of an optical disk apparatus
The present invention relates to an optical head of an optical disk apparatus and a method of making the same, and more particularly, to an optical head which projects a light spot onto a track...
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4802719 |
Infra-red laser shield
A method of making a holographic optical element is disclosed. The method comprises the steps of determining the separation between interference pattern planes tangent to surfaces separated by a...
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4799739 |
Real time autostereoscopic displays using holographic diffusers
Methods and apparatus for providing real time autostereoscopic displays using holographic diffusers are disclosed. In accordance with the method, a diffuse holographic optical element is fabricated...
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4794585 |
Optical head having a hologram lens and polarizers for use with magneto-optic medium
An optical head which uses a single diffraction grating to eliminate the need for both a beam-splitter and a biprism lens. This invention allows the placement of all the elements except the...
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4792197 |
Fabrication method and equipment for diffraction gratings
A method and equipment for fabricating two diffraction gratings having the same period but phases that are shifted by λ/4 on a work to be treated. A laser beam is divided into two light beams and...
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4790613 |
Holographic display panel for a vehicle windshield
An improved hologram display panel for a vehicle is provided. Sensors can monitor the operating characteristics of the vehicle and virtual images of indicators can be realized by the illumination...
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4789977 |
Optical data recording device
An optical data recording device for focusing a laser beam on a recording medium for storing and reading out information therefrom. The device is characterized by using a high efficiency...
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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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4786124 |
Broad-spectrum achromatic phase shifters, phase modulators, frequency shifters, and frequency modulators
Achromatic optical systems forming phase shifters and phase modulators are presented and shown to impart (temporal) phase-angle shifts in incoming waves which are independent of wavelength over...
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4773719 |
Optical novelty filter
Changes in an image are detectable by a tracking novelty filter while an incorporated holographic medium is in disequilibrium. A suitably doped single-domain barium titanate crystal can serve as...
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4764889 |
Optical logic arrangement with self electro-optic effect devices
An arrangement for performing an optical logic operation. The optical logic arrangement comprises a plurality (100) of reflection holograms (101-109) positioned in a two-dimensional array for...
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4764890 |
Optical logic arrangement
An arrangement for performing an optical logic operation. The optical logic arrangement comprises a plurality (100) of reflection holograms (101-109) positioned in a two-dimensional array for...
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