Matches 151 - 200 out of 235 < 1 2 3 4 5 >
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5383038 Holographic optical memory using semiconductor microcrystallite doped glasses and method using same  
There is described a semiconductor microcrystallite doped glass that exhibits SHG, and a method of preparing, or encoding, a semiconductor microcrystallite doped glass by the simultaneous injection...
5360575 Lactic acid derivatives having two asymmetric carbon atoms, liquid crystal composition containing same and liquid crystal device  
An optically active lactic acid derivative having the formula (1a): ##STR1## wherein A is O or S; B is --(CH 2 ) m -- or --(CH 2 ) n --O; R1 is an alkoxy group having 1-22 carbon atoms, a...
5341229 Holographic display system  
A portable holographic display system emboding holographic plates which are disposed upon a plurality of thin film holographic emulsions coupled to multiple channel Kerr units that generate a...
5291321 Method and apparatus for making hologram  
A method and an apparatus for making a hologram wherein interference patterns to be recorded on a hologram plate are prevented from travelling, thereby enabling a high quality hologram to be made....
5270853 Method and apparatus for imaging an object in or through a scattering medium by using multiple-wave mixing  
A method and apparatus for imaging an object that is part of, embedded in, or viewed through a scattering medium is provided. A broadband stochastic beam generator, such as a broadband laser,...
5262879 Holographic image conversion method for making a controlled holographic grating  
A method for converting a 2-D image into a hologram is set forth. An optical scanner system which measures the primary color intensity of a selected pixel and forms an indication thereof is...
5257118 Method for holographically combining laser beams  
A holographic recording of the interference between an object laser beam and a reference laser beam is used to combine the amplitudes of multiple laser beams which are conjugates of the reference...
5253086 Holographic device for combining laser beams  
A holographic recording of the interference between an object laser beam and a reference laser beam is used to combine the amplitudes of multiple input laser beams which are conjugates of the...
5216527 Holographic collation  
A method and apparatus for the collation or fine comparison of closely related images made with coherent light, such as those that may arise in holographic interferometry, in holo-photoelasticity,...
5198915 Underwater inspection apparatus and method  
A camera for use in holography comprises a source of coherent radiation (55), a beam splitter (55,56) for splitting radiation from said source into a reference and a recording beam, a film holder...
5174298 Imaging process and system for transillumination with photon frequency marking  
In an imaging process and system by transillumination of a medium illuminated by transparency by a beam, an acoustic transducer emits an acoustic wave in the medium which interferes with the beam....
5142385 Holographic lithography  
First and second coherent beams illuminate a common area on an exposure station. A phase detector senses the relative phase between the first and second beams to provide a control signal. There is...
5124815 Method for forming holographic optical elements free of secondary fringes  
Holographic optical elements relatively free of unwanted, secondary fringes are produced using light having a limited coherence. A photosensitive material of a predetermined thickness records the...
5121231 Incoherent/coherent multiplexed holographic recording for photonic interconnections and holographic optical elements  
The present invention relates to a novel architecture and associated apparatus for the development of highly multiplexed photonic interconnection networks and holographic optical elements with...
5121227 One step rainbow holography  
Improved optical holographic apparatuses are disclosed for making white light viewable rainbow holograms in one step utilizing concave mirror optics. On-axis and off-axis configurations are...
5120621 Holographic exposure method and apparatus  
This invention relates to a method and apparatus for exposing a photosensitive film on a holographic plate to fabricate a reflective holographic optical element. The apparatus incorporates...
5113079 Non-destructive testing of aircraft for structural integrity using holographic moire patterns  
A method of using the classic principles of moire patterns and holography to provide defect analysis of variable sensitivity on structures of various sizes, including large aircraft. By taking...
H001060 Microstructure correlation counter  
An apparatus for analyzing unknown microstructures in samples with known microstructure configurations, both biological and non-biological, by optically correlating the unknown with the known. The...
5105287 Reduction of holographic noise with short laser pulses  
A pulsed laser provided a pulsed incident beam which impinges a recording assembly which includes a glass substrate and a recording film adhered thereto. The pulse can be singular or multiple. In...
5096790 Process of forming hologram and polymeric holographic recording medium with sensitizer  
A new class of sensitizers for photopolymerizable compositions is disclosed derived from cyclic ketones and tricyclic aminoaldehydes. A preferred compound is cyclopentanone,...
5090789 Laser light show device and method  
A laser light show device and method produces a surface projected or suspended holographic image, and includes multiple image projectors. One image projector provides the object image information...
5071208 Two beam method for forming holographic optical elements free of secondary fringes  
Holographic optical elements relatively free of unwanted, secondary fringes are produced by passing the light beam from a laser through a rotating diffusing plate to generate a beam of light having...
5064257 Optical heterodyne scanning type holography device  
There is disclosed an optical heterodyne scanning holography device capable of recording and reconstructing a holographic image of an object in real time by optical heterodyne-scanning the object,...
5052765 Scanning fiber optic holographic exposure and feedback system  
A fiber optic point source is utilized to generate a first wavefront which is intersected with a second wavefront to form a desired interference pattern in a recording medium. The point source is...
5052764 System and method for forming a holographic exposure with a simulated source  
A fiber optic point source is utilized to generate a first wavefront which is intersected with a second wavefront to form a desired interference pattern in a recording medium. The point source is...
5039182 Storing information in dual holographic images  
A holographic storage system receives light having its linear polarization rotated from a reference linear polarization for carrying given information. The modulated light is stored as two distinct...
5025488 Optical heterodyne detector  
Nonlinear optical devices and techniques are used to provide heterodyne detection for coherent optical communications. Heterodyne detection is achieved by matching the wave front of a local...
5016951 Fiber optic diffraction grating maker  
A compact and portable diffraction grating maker comprised of a laser beam, optical and fiber optics devices coupling the beam to one or more evanescent beam splitters, and collimating lenses or...
5014709 Method and apparatus for high resolution holographic imaging of biological tissue  
Apparatus and methods for high resolution holographic recordation and microscopic examination of the holographic image of biological tissue. A single beam Denisyuk holographic recordation of the...
4984856 Holographic exposure system to reduce spurious hologram noise  
A method and apparatus of exposing a hologram to reduce spurious noise holograms. The exposure light source is moved relative to a recording module within predetermined distances that will ensure a...
4976504 Holographic method and apparatus using incoherent light  
A method of generating a quasi-complex hologram using incoherent light and a conoscope system comprising a birefringent crystal (30) inserted between two circular polarizers (10, 20), the method...
4955974 Apparatus for generating x-ray holograms  
Apparatus for x-ray microholography of living biological materials. A Fourier transform holographic configuration is described as being most suitable for the 3-dimensional recording of the physical...
4925260 One step rainbow holography  
Improved optical holographic apparatuses are disclosed for making white light viewable rainbow holograms in one step utilizing concave mirror optics. On-axis and off-axis configurations are...
4923771 Diamond-shaped mask for making multiple exposure holograms  
A method and apparatus for forming a multiple exposure hologram includes an object beam cut out mask 24 and reference beam cut out mask 60. Different segments of the masks are left uncovered during...
4889780 Multiple exposure hologram for minimizing crosstalk  
A method and apparatus for forming a multiple exposure hologram includes an object beam cut out mask 24 and reference beam cut out mask 60. Different segments of the masks are left uncovered during...
4889398 Self referencing ambiguity free holography  
A method for self-referencing holography makes use of multiple object illuminations with different and non-uniform intensity of radiation to produce multiple holograms from the scattered radiation....
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...
4874213 Method of forming volume phase reflection holograms  
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...
4860253 Associative memory system with spatial light modulator and feedback for adjustable thresholding and enhancement  
An associative memory system incorporating a hologram, a spatial light modulator (SLM) and thresholding components in a feedback loop to derive an enhanced reference beam for use in reconstructing...
4857425 Manufacture of integrated circuits using holographic techniques  
A method of manufacturing integrated circuits using holographic techniques by interference between an input beam and a reference beam generated from laser sources. A holographic image of the object...
4655539 Hologram writing apparatus and method  
An improved hologram writer writes a halogram from a three dimensional data stream or signal such as a signal corresponding to a scene, a picture, drawing or the like. A reference beam and an...
4643515 Method and apparatus for recording and displaying edge-illuminated holograms  
Methods and apparatus for recording and displaying edge-illuminated holograms. Disclosed is a method for producing holograms whereby the reference beam, when recording, and the illumination beam,...
4605606 Gaussian laser beam filter  
A method for constructing an optical filter for use in a holographic scanner includes exposing a photographic film to a laser, developing the film and reinserting the developed film into the...
4592618 Holographic recording and related reading process  
A holographic process is provided for recording-reading by means of index strata in the volume of a photoexcitable storage medium. This process consists in causing two beams to interfere in this...
4498729 Method and apparatus for making achromatic holograms  
A method of producing achromatic holographic images of an object, and a diffraction grating useful for making an achromatic hologram. The method comprises the steps of making a monochromatic...
4458978 Double beam systems for forming improved holograms  
The systems of the invention form improved reflection and transmission holograms utilizing two beams and eliminating all of the higher energy spurious holographic recordings that are caused by...
4456328 Systems for forming improved diffusion holograms  
The hologram forming systems of the invention form diffusion type holograms in which undesired spurious transmission hologram recordings are eliminated. The reflecting surfaces are moved during the...
4456327 Extensive field camera  
A camera in accordance with the invention comprises a coherent light source from which is formed an object illuminating beam and a pumping radiation beam, and an interaction medium for receiving...
4279462 Method of holographic processing of waves  
A new method for holographic processing of waves by means of an optical system is disclosed. The method is based on the generation of an unrecorded hologram, herein denoted virtual hologram, which...
4277127 Dopler extended depth of field imaging system with coherent object illumination  
A packageable system employs principles of Doppler holography on near-field objects to produce images from which photographs, transparencies or video reproductions can be made with simultaneous...
Matches 151 - 200 out of 235 < 1 2 3 4 5 >