Matches 101 - 150 out of 170 < 1 2 3 4 >
Match Document Document Title
4959283 Dry film process for altering wavelength response of holograms  
Wavelength response of volume holograms is altered by contact with a dry film diffusion element.
4936642 Method of constructing a hologram whose thickness is independent of the thickness of the holographic recording material  
A method of constructing flare-free reflection holograms uses a light scattering mechanism positioned between a first exposure beam and holographic recording material to remove the spatial...
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....
4839250 Method of replicating 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...
4677629 Means for phase locking the outputs of a surface emitting laser diode array  
An array of diode lasers, either a two-dimensional array of surface emitting lasers, or a linear array of stripe lasers, is phase locked by a diode laser through a hologram which focuses the output...
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...
4478490 Noise reduction in coherent systems  
A method of producing coherent radiation signals which have reduced coherent noise content. The method involves modulation of the position of an apodizer or aperture disposed in the optical path of...
4451114 Method for recording and reconstructing pulse laser holograms in color  
A method for recording and reconstructing a hologram recorded with two pulse laser beams having different wavelengths in order to increase the illuminance of the reconstructed image recorded in one...
4130348 Optical system for a coherent light illuminating source  
An optical system for a object illuminating light source includes a phase plate for giving "0"-relative phases or "π"-relative phases to the incident light fluxes to cancel with respect to one...
4130338 Hologram having expanded viewing area  
The use of a lenticular array in the formation of the object-illuminating beam used in the recording of either a Fresnel, a Fraunhofer or an image plane hologram, permits the reconstructed image of...
4071291 Holographic method for forming color holograms  
A color hologram is recorded on a holographic recording material sequentially by use of different color coherent light beams with a stripe filter placed on the recording material and moved by a...
4037919 Holographic device with divided object beams, a multicolor light source and direction-selective screen  
A holographic device comprises a film for displaying a three-dimensional object as images, each of which is obtained as viewed in a respective one of a plurality of different directions, a phase...
3990773 Binary-coded Fraunhofer hologram recording technique  
An array of equi-spaced photodetectors can be used to detect the reconstructed image of a binary-coded Fraunhofer hologram read out at a different wavelength from that employed in recording the...
3970390 Multifrequency laser oscillator for holographic contouring  
A multifrequency laser oscillator which generates coherent light of two closely adjacent optical frequencies in rapid succession for recording contour holograms by the double exposure technique....
3947085 Method of producing a hologram with an orthoscopic image  
A method of producing a hologram with an orthoscopic, at least partially real image of an object is disclosed. According to the method, the object is recorded on a first hologram and is then...
3942861 Full view hologram  
A single flat sheet hologram is provided which when illuminated displays substantially a 360° view of an object space. This is done by recording both left and right hand views of the object space...
3934461 Multiple exposure holographic interferometer method  
Apparatus and method wherein a photographic plate is doubly exposed by pulsed laser illumination to record successive instants in the history of an object under consideration. The doubly exposed...
3909111 Controlled angle viewing screens by interference techniques  
A hardened gelatin film on a transparent substrate forms a rear projection viewing screen providing high efficiency and uniformity of illumination with predetermined scattering characteristics over...
3894787 Holograms  
An off-axis hologram of a 3-dimensional solid object comprising a detector having a pattern of interference fringes constituting a grating-like structure which, when illuminated with coherent...
3888561 Real time, large volume, moving scene holographic camera system  
A holographic motion picture camera system producing resolution of front surface detail. The system utilizes a beam of coherent light and means for dividing the beam into a reference beam for...
3858963 TRANSVERSE MODE SELECTION IN LASERS FOR HOLOGRAPHY  
A generally annular mode selector is located in a laser cavity and allows lasing in a uniphase or fundamental transverse mode through an aperture in the mode selector, as well as in higher-order...
3838903 WAVEFRONT RECONSTRUCTION  
The invention is directed to methods and apparatus for capturing various patterns of electromagnetic energy emanating from or as they are transformed after passing through an object and reproducing...
3837725 SYSTEMS FOR CONSTRUCTING SMALL FRESNEL HOLOGRAMS  
The present invention relates to the construction of Fresnel holograms having an area smaller than the area of the non-uniform transparency object utilised to construct them. The invention relates...
3832026 HOLOGRAPHY USING LIGHT OF LIMITED COHERENCE  
A method is disclosed for forming good quality holograms using light of only limited coherence. According to the method, a hologram plate is illuminated by a reference laser beam and by laser light...
3799643 LASER SPATIAL COHERENCE COMPENSATION IN HOLOGRAPHY  
A compensating technique for use with a high-powered laser light source having an output with a plurality of transverse modes is disclosed which utilizes a diffusive medium placed between the laser...
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...
3779625 HOLOGRAPHIC RECORDING WITH TWO GROUPS OF DIFFERENTLY ORIENTED PLANE POLARIZED OBJECT ILLUMINATION BEAMS  
The present invention is directed to a method and apparatus for recording information on a holographic storage medium which information is presented in an information mask characterized by...
3756684 COARSE PINHOLE ARRAY FOR RECORDING IMPROVED REDUNDANT HOLOGRAMS  
The use of a redundancy means including a pinhole array having a ratio of the distance between adjacent pinholes to the maximum linear dimension of a pinhole of at least 30 not only provides high...
3752556 REAL TIME MOVING SCENE HOLOGRAPHIC CAMERA SYSTEM  
A holographic motion picture camera system producing resolution of front surface detail. The system utilizes a beam of coherent light and means for dividing the beam into a reference beam for...
3743421 SYSTEM FOR IDENTIFYING PERSONNEL BY FINGERPRINT VERIFICATION AND METHOD THEREFOR  
An optical recognition device which employs a source of incoherent quasi-monochromatic light for illuminating an input prism upon which a fingertip to be verified as that of a particular individual...
3723012 HOLOGRAPHIC ALIGNMENT SYSTEM  
A method and apparatus for repositioning a body such as a diffuser body, hologram film or a body rigidly attached thereto in a previous position in a system characterized by making or exposing a...
3711177 APPARATUS FOR MAKING AND RECONSTRUCTING REFERENCE BEAM CODED HOLOGRAMS  
An apparatus for making and reconstructing a reference beam coded hologram. A source beam of partially coherent light is amplitude divided into separate angularly displaced reference and object...
3698788 MULTIPASS INTERFEROMETER  
An interferometer is provided with a multipass optical cavity. In the multipass optical cavity, an object beam passes several times through the object space. The sensitivity of the interferometer...
3692380 METHOD AND APPARATUS FOR PRODUCING HOLOGRAMS UTILIZING A PLURALITY OF SHORT FOCUS CONVEX LENSES  
A plurality of short focus convex lenses are irradiated with a coherent beam of light. The coherent beam of light is diffused by the lenses and the diffused light is directed to a storage plate....
3689129 HIGH RESOLUTION, REDUNDANT COHERENT WAVE IMAGING APPARATUS EMPLOYING PINHOLE ARRAY  
By properly selecting the distance between a non-scattering object and a matrix of point sources through which the object is illuminated with coherent wave energy, a pinhole array which in itself...
3680944 HOLOGRAPHIC APPARATUS UTILIZING A PULSED LASER  
A holographic apparatus capable of utilizing a pulsed laser developing an incompletely coherent light beam for taking holograms, particularly in reflection. The apparatus makes use of a diffuser...
3680943 HOLOGRAPHIC IMAGING HAVING IMPROVED RESOLUTION AND INTENSITY BY SYNTHETICALLY ENLARGING THE APERTURE  
Apparatus for constructing holograms in which reflective or refractive materials are used to recover normally lost object radiation to thereby produce higher spatial frequencies in the...
3677616 REDUCED NOISE HIGH RESOLUTION HOLOGRAPHIC IMAGING USING SPATIALLY INCOHERENT RECONSTRUCTING RADIATION  
An improved technique for coherent illumination and imaging of non-diffuse objects, including non-diffuse transparencies, wherein a periodic intensity variation across the illuminating beam at the...
3661438 HOLOGRAPHIC DATA STORAGE AND RETRIEVAL SYSTEM  
A holographic data storage and retrieval system, wherein by stacking a plurality of surface recorded flat base members and by edge illumination thereof by a coherent light source, a high density...
3652144 AMPLITUDE WEIGHTING IN HOLOGRAPHY  
Holographic system in which the signal (object) beam, the reference beam, or the readout beam is weighted (i.e., shaped) in amplitude as a function of the spatial coordinates of the hologram plane....
3650595 REDUNDANT, SPECKLE-FREE HOLOGRAM RECORDING APPARATUS  
There is disclosed the use of a phase diffraction, rather than a plate of diffusing glass, for introducing redundancy into the information beam which is employed together with a reference beam in...
3647275 IDENTIFICATION SYSTEM USING REFERENCE BEAM CODED HOLOGRAMS  
An identification system for identifying persons, articles, documents and the like using a coded hologram which contains the desired identifying indicia in coded holographic form. Encoding of the...
3644047 APPARATUS AND METHOD OF SIMULTANEOUSLY INSPECTING A PLURALITY OF SURFACES OF A BODY BY HOLOGRAPHIC INTERFEROMETRY  
To detect imperfections on at least two nonparallel surfaces of a pneumatic tire simultaneously the tire is inflated on a rotatably supported wheel and a hologram is formed of surfaces to be...
3640599 SIMULATION OF AN EXTENDED INCOHERENT OBJECT SOURCE IN HOLOGRAPHY SO AS TO ELIMINATE SPECKLE NOISE  
This specification discloses systems for recording holograms and for reconstructing images from such holograms. The object of which the hologram is to be made is illuminated with a plurality of...
3635539 WIDE-ANGLE HOLOGRAPHIC APPARATUS  
A method and apparatus for constructing wide angle holograms. The construction apparatus comprises propagating onto a Ronchi ruling and photographic plate serially disposed in the path of the beam....
3632214 METHOD AND APPARATUS FOR STABILIZING THE PHASE OF RADIATION  
Stabilization of the phase of the radiation utilized in a plural beam interferometric-type system is accomplished. Monitoring of the intensity of the interfering beams of radiation is performed so...
3619023 OPTICAL ELEMENT FOR GENERATING CONTOUR STRIPES  
An optical element for generating in space a fringe pattern consisting of light maxima and minima. This optical element consists of a hologram on which light from two adjacent light sources...
3619022 METHOD OF MAKING AN OBJECT DEPENDENT DIFFUSER  
A technique for making optimized phase objects which can uniformly diffuse the information content in a physical wave front across a defined recording plane.
3619021 METHOD OF MAKING A DIFFUSING LAYER  
A photosensitive layer is exposed by a first light wave field having random phase distribution with peaks and valleys representing different amounts of exposing light, whereupon the exposed layer...
Matches 101 - 150 out of 170 < 1 2 3 4 >