Matches 551 - 600 out of 724 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >
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5280388 Wavelength selective phase grating optical low-pass filter  
A phase grating optical low-pass filter having wavelength selectivity consisting of a plurality of layers which are the same in refractive index at a certain wavelength and different from one...
5278679 Sub-diffraction limited focusing lenses  
This invention relates to the fabrication of lenses which can focus a light beam to a spot size which is smaller than that allowed by diffraction theory. A composite lens function is constructed...
5274720 Optical system having a ring-shaped waveguide  
An optical connector comprises a ring-shaped waveguide and a straight waveguide for introducing a light beam into the waveguide. These waveguides are arranged on a substrate in a manner such that...
5260828 Methods and means for reducing temperature-induced variations in lenses and lens devices  
A lens composed of a single material and having at least one refractive surface on one face and a kinoform on the other face. The purely refractive between the surfaces varies dimensionally and in...
5258871 Dual diffraction grating beam splitter  
A dual diffraction grating useful in optical disk heads comprises first and second light diffracting surfaces of identical pitch and depth, wherein the diffraction grooves of the first and second...
5258862 Rotating disc optical synchronization system using binary diffractive optical elements  
An optical synchronization system uses a stationary binary diffractive optical element and a rotating disc with alternating binary diffractive optical elements and blocking elements to create a...
5257133 Re-imaging optical system employing refractive and diffractive optical elements  
A re-imaging optical system (36) is provided which utilizes a combination of refractive and diffractive optical elements. The system includes an objective lens group (38) for focusing an incoming...
5257131 Polarization diffraction element and polarization detector employing the same  
A polarization diffraction element comprising two diffraction gratings formed on both faces of a substrate respectively. Both the diffraction gratings have grating lines which are arranged at the...
5245596 Optical head having a grating with a doubly periodic structure  
An optical head is disclosed in which a beam from a diode laser is directed onto an optical disc, and a beam reflected from the optical disc is passed through an optical device which forms a...
5238785 Method of manufacturing a diffraction grating for a semiconductor laser  
A method for manufacturing a diffraction grating includes applying a resist, the developing speed of which has an extreme at a certain exposure intensity, to a substrate on which the diffraction...
5233444 Focus error detecting apparatus  
A focus error detecting apparatus in which a light emitting and receiving element including a light emitting portion and light receiving portions all of which are formed in a common semiconductor...
5229883 Hybrid binary optics collimation fill optics  
A cylindrical lens and a binary optical element for collimating with low optical aberrations an asymmetrically diverging input wavefront. The binary optical element is formed on a planar substrate...
5227915 Diffractive optical element  
A diffractive optical element and a method to produce same is disclosed. The optical element comprises a base and at least first and second phase zones wherein the first phase zone comprises a...
5226100 Optical grating comprising a plurality of side-by-side outfeed end faces of optical waveguides  
An optical grating being formed by a waveguide branching structure having a single infeed end face for infeeding an optical wave to be coupled into the grating, said branching structure is composed...
5223978 Hybrid diffractive/refractive lens  
A hybrid lens for collimating, with low optical aberrations, an asymmetrically diverging input wavefront. The hybrid lens has a front surface which serves to diffract the input wavefront and a back...
5223956 Optical beam scanners for imaging applications  
Laser beam scanners having a polarization sensitive beam deflecting surface (specifically a monofacet nondisc plane diffraction grating (NPDG) monofacet deflector and a dual reflection monofacet...
5218471 High-efficiency, multilevel, diffractive optical elements  
The method utilizes high resolution lithography, mask aligning, and reactive ion etching. In particular, at least two binary amplitude masks are generated. A photoresist layer on an optical element...
5212707 Array of diffraction limited lasers and method of aligning same  
A one-dimensional semiconductor laser array assembly typically comprising a one-dimensional semiconductor laser array, a heatsink upon which the laser array is bonded, and a lens assembly. The...
5208701 Wobble correction lens with binary diffractive optic surface and refractive cylindrical surface  
A wobble correction lens for a raster output scanner combines a positive cross-scan plano-cylindrical lens, which provides most of the optical power for focusing the light beam to a scan line, with...
5208700 Lens cover assembly for binary diffractive optic lenses  
A plurality of binary diffractive optic lenses are formed within a corresponding plurality of recesses in the surface of one substrate. The substrate with the binary diffractive optic lenses in the...
5200939 Optical head apparatus including a waveguide layer with concentric or spiral periodic structure  
An optical head arranged in such a manner that light emitted from a semiconductor laser (8) is inputted and coupled in a waveguide layer (3C) by a grating coupler (4C) having a concentric or spiral...
5182659 Holographic recording and scanning system and method  
A system that provides a structure which makes use of a recording geometry in which no significant Seidel induced aberrations arise. The recording geometry results in a pattern recorded on a...
5177635 Polarizer for infrared radiation  
An infrared polarizer has a transparent substrate on which a pattern of spaced metal stripes is deposited. The stripe thickness is approximately equal to at least the stripe spacing which results...
5166826 Band-pass filter for electromagnetic radiation  
In a band-pass filter for electromagnetic radiation comprising a membrane having periodically arranged slot structure elements formed therein each consisting of at least three slots of equal length...
5162943 Image reading apparatus with a diffraction grating  
An image reading apparatus including a diffraction grating element including a transparent plate shaped in the form of consecutive steps to separate a light reflected from a document into a zero...
5162929 Single-beam, multicolor hologon scanner  
A three-color laser scanner using a holographically-generated plane linear grating disk (hologon). The disk includes peripherally-arranged facets having identical multiplexed diffraction gratings....
5161059 High-efficiency, multilevel, diffractive optical elements  
A high-efficiency, diffractive optical element having at least one surface including multilevel steps, the steps determined by calculating equiphase boundaries utilizing a disclosed equation and...
5161058 Focusing screen  
A phase type focusing screen has a plurality of minute patterns of a given shape formed by protrudent and/or recessed parts and allocated on a surface of an optically transparent base plate....
5155622 Polarizing optical element and device using the same  
A polarizing optical element which comprises a first substrate having a first surface formed with first and second gratings so as to cross relative to each other at a predetermined crossing angle,...
5144483 Diffractive multifocal optical device  
A bifocal lens of the Cohen lens design utilizing phase zone plate optics and a facet depth of one-half wavelength of the design wavelength, where the primary focal points are at two orders,...
5132812 Method of manufacturing display having diffraction grating patterns  
A method of manufacturing a display having diffraction grating patterns, includes the steps of (a) obtaining a plurality of two-dimensional images by observing an object at a plurality of...
5131736 Solid colloidal optical wavelength filter  
A solid colloidal optical wavelength filter includes a suspension of spheal particles dispersed in a coagulable medium such as a setting plastic. The filter is formed by suspending spherical...
5124843 Array illuminator using a binary optics phase plate  
An optical element for converting a uniform beam of light of wavelength λ into an array of illuminated spots, the optical element including a phase plate made of an array of constant phase zones;...
5122903 Optical device and optical pickup device using the same  
An optical element having a substrate and a composite grating pattern formed thereon. The pattern is constituted with two different kinds of grating patterns superimposed on the substrate. When one...
5121980 Small aperture multifocal  
An optical device suitably employable in intraocular and contact lenses that employs a phase zone plate of a Cohen lens design that relies on a small number of zones to provide multifocal images.
5121979 Diffractive multifocal optical device  
A bifocal lens of the Cohen lens design utilizing phase zone plate optics and a facet depth of one-half wavelength of the design wavelength, where the primary focal points are at two orders,...
5117306 Diffraction bifocal with adjusted chromaticity  
A diffraction bifocal lens or lens system, comprising two profiled surfaces or interfaces or a linear combination thereof, wherein one profile provides for the bifocality of the lens and the other...
5116461 Method for fabricating an angled diffraction grating  
A method for fabricating an angled diffraction grating (12) is provided. An optical medium (13) with fine lines and spaces that are defined in an etch mask is provided. Transferring the defined...
5116111 Multi-focal diffractive ophthalmic lenses  
A multifocal ophthalmic lens has diffractive power produced by a plurality of concentric zones. The zones have radii that meet the condition R 0 2 is not equal to R 1 2 -R 0 2 where R 0 is the...
5115344 Tunable diffraction grating  
A diffraction grating can be tuned by varying the spacing of the rows of the diffraction grating. The diffraction grating is comprised of rows of an electrically conductive material disposed on a...
5113286 Diffraction grating apparatus and method of forming a surface relief pattern in diffraction grating apparatus  
A phase diffraction grating apparatus which is usable to generate an array of N spots, where n is an even integer, and the N spots are substantially equally spaced. The generation of an even number...
5111449 Optical pick-up device using diffraction grating element having two sub-regions  
An optical pick-up device for focusing a laser beam emitted from a light emitting element through an optical system onto a recording medium. The beam is reflected from the recording medium and...
5104209 Method of creating an index grating in an optical fiber and a mode converter using the index grating  
This invention relates to a method of creating an index grating in an optical fiber comprising disposing a slit mask containing one or more slits over a side of an optical fiber, illuminating the...
5103324 Method for fabricating holographic filters  
A method for generating holographic optical elements such as power spectrum filters is carried out using a printer and a computer. A signal function is input into the computer and traced by the...
5100226 Diffractive ophthalmic lens for correcting astigmatism  
An artificial eye lens such as a contact lens or intra-ocular lens corrects astigmatism by two sets of substantially linear parallel zones arranged to diffract light predominantly into one order at...
5091798 Diffraction grating for optical scanning  
A diffraction grating comprises the plurality of grating rings provided at positions such that their radii r are selected so that a function φ(r) of r satisfies the following differential equation...
5089903 Display apparatus  
A display apparatus comprises a display, a first diffraction grating for diffracting light from the display, and a second diffraction grating for diffracting diffracted light from the first...
5089835 Phase-type diffusing plate  
A focusing screen suited to be used in the camera, having three plane portions of different heights in each of small areas, wherein the plane portion A, the plane portion B and the plane portion C...
5085496 Optical element and optical pickup device comprising it  
An optical element comprises a polarization diffraction element that is provided with diffraction gratings that are respectively mounted on different faces of a transparent substrate of a flat...
5080465 Diffraction grating and method of making  
A diffraction grating, comprises a plurality of grooves formed by a plurality of first facets having a first set of propagative optical characteristics. All facets are generally positioned with a...
Matches 551 - 600 out of 724 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >