Matches 51 - 100 out of 217 < 1 2 3 4 5 >
Match Document Document Title
6909547 Security element with diffraction structures  
A security element ( 2 ) comprising a plastic laminate has a surface pattern ( 12 ) composed mosaic-like from surface elements ( 13; 14; 15 ). Shaped into at least two of the surface elements ( 14;...
6903872 Electrically reconfigurable optical devices  
The invention refers to electrically reconfigurable optical devices based on the use of a layer of dielectric and transparent viscoelastic material (G) opposing at least a first electrode structure...
6900919 Variable blazed grating  
In one aspect of the invention, an apparatus operable to provide optical signal processing includes an inner conductive layer including an at least substantially conductive material and a plurality...
6894836 Diffraction grating, method of making and method of using  
A diffraction grating device operable as a reflection or transmission grating, and a method of manufacturing and using any number of such grating devices so that each device is individually...
6888613 Diffractive focusing using multiple selectively light opaque elements  
A diffractive focusing device includes a light transmissive substrate and a plurality of selectively light opaque elements formed in the light transmissive substrate. The selectively light opaque...
6876792 Phase mask for forming diffraction grating, and optical fiber and optical waveguide having diffraction grating duplicated using the phase mask  
The present invention relates to a precision phase mask for forming diffraction grating in optical fiber and optical waveguide, to provide them with nonlinear chirped grating for dispersion...
6856461 Tunable optical filter  
A tunable optical device for adding or dropping one or more channels in a wavelength division multiplexing communication system is disclosed. The tunable optical device comprises one or more...
6847479 Variable blazed grating  
In one aspect of the invention, an apparatus operable to provide optical signal processing includes an inner conductive layer including an at least substantially conductive material and a plurality...
6844974 Variable blazed grating  
In one aspect of the invention, an apparatus operable to provide optical signal processing includes an inner conductive layer including an at least substantially conductive material and a plurality...
6844973 Plane diffraction grating based on surface normal rotation and its application to an optical system  
A plane diffraction grating based on surface normal rotation according to the present invention is designed so that the profile of the grooves at a radial area is determined depending on a...
6829092 Blazed grating light valve  
A light modulator includes elongated elements arranged parallel to each other. In a first diffraction mode, the light modulator operates to diffract an incident light into at least two diffraction...
6822797 Light modulator structure for producing high-contrast operation using zero-order light  
An optical system provides high-contrast operation by collecting zero order light. The optical system comprises a light modulator and a collector. The light modulator is preferably a grating light...
6819393 Optical device and display apparatus using light diffraction and light guide  
An optical device and a display apparatus of the present invention are constructed so as to improve display characteristics of output light intensity, display contrast, and reduction of scattered...
6816648 Integrated waveguide gratings by ion implantation  
Integrated semiconductor waveguide gratings, methods of manufacture thereof and methods of apodizing thereof are described. A semiconductor waveguide grating includes a substrate, a cladding layer...
6804059 Wide-band tunable optical filter using electroholograms written into photorefractive crystals  
A tunable optical filter utilizes multiple electroholographic (EH) gratings with different center wavelengths to filter an optical signal over a wide wavelength range. The EH gratings are connected...
6801354 2-D diffraction grating for substantially eliminating polarization dependent losses  
A 2D diffraction grating light valve modulates an incident beam of light. A plurality of elements each have a reflective surface with their respective reflective surfaces substantially coplanar....
6760159 Diffractive optical element and optical system having the same  
In a diffractive optical element, which is formed by laminating at least three layers of diffraction gratings made of at least three kinds of materials which differ in dispersion, at least three...
6750998 Electro-mechanical grating device having a continuously controllable diffraction efficiency  
An electro-mechanical grating device including: a base having a surface; a bottom conductive layer provided above said base; a spacer layer is provided and a longitudinal channel is formed in said...
6671096 Diffractive optical element and an optical system having a diffractive optical element  
A diffractive optical element for white light is composed of a plurality of layers of optical materials and has a relief pattern constituting a diffraction grating formed at least at one cementing...
6646778 Grating light valve with encapsulated dampening gas  
An optical MEM device is encapsulated with a dampening gas to reduce oscillatory vibrations of movable parts during the operation of the device. Preferably, the dampening gas comprises one or more...
6643066 Tunable phase mask assembly  
A tunable phase mask assembly for use in photoinducing an optical wavelength filter in an optical waveguide. The phase mask assembly includes a phase mask having a length extending between two...
6643065 Variable spacing diffraction grating  
A variable spacing diffraction grating is fabricated using micro-electromechanical (MEMS) technology. An array of interconnected beam elements is fabricated into a diffraction grating and mounted...
6639722 Stress tuned blazed grating light valve  
A light modulator includes elongated elements arranged parallel to each other and suspended above a substrate. The light modulator operates in a first diffraction mode and in a second diffraction...
6636666 Optical power equalizer  
The methods and apparatus according to the invention equalize the power of at least one frequency in a multi-wavelength optical signal, or limit the power contained in a single or multi-frequency...
6631032 Renewable liquid reflection grating  
A renewable liquid reflection grating. Electrodes are operatively connected to a conducting liquid in an arrangement that produces a reflection grating and driven by a current with a resonance...
6624943 Diffractive optical element and optical system having the same  
A diffractive optical element includes a plurality of laminated diffraction grating surfaces. Each of the diffraction grating surfaces is formed to have a sufficiently small grating thickness as...
6618187 Blazed micro-mechanical light modulator and array thereof  
A light valve of deformable grating type and a method for light modulation using the light valves is provided. The light valve of deformable grating type, includes at least three beams, one beam of...
6611377 Micromechanical diffraction phase grating  
A micromechanical reflection phase grating may be formed of spring-like ribbon reflectors that are secured to a transparent cover positioned over a substrate such as a silicon substrate. The ribbon...
6603902 Wavelength selective variable reflector  
An arrangement is provided having an optical waveguide, a Chirp grating and an electro-optic material arranged adjacent the Chirp grating, the electro-optic material, for example liquid crystal...
6594060 Electromechanical conformal grating device with improved optical efficiency and contrast  
An electromechanical conformal grating device having a period Λ, that includes: an elongated ribbon element including a light reflective surface; a pair of end supports for supporting the...
6510256 Method and arrangement in connection with optical bragg-reflectors  
A method of establishing transmission of light through a chirped Bragg-reflector, a method of analyzing the power spectrum of a light signal using a chirped Bragg-reflector, and an arrangement for...
6490075 Acousto-optic tunable filter hyperspectral imaging system  
The present invention has applications that include detecting color variation in a region, for example, color variations due to temperature changes in an area of ocean water, and, in a more...
6480334 Agile beam steering using phased-array-like elements  
Agile steering of a laser beam using a pair of complementary optical elements which are mechanically translated. The elements consist of pixelated steps of varying depth. Structure is provided to...
6479811 Method and system for calibrating a diffractive grating modulator  
A diffractive grating modulator system, includes: a diffractive grating modulator active to produce a plurality of output orders of diffraction; an illumination source for directing light onto the...
6473211 Optical crossbar switching and/or routing system  
A switching and/or rotuing system that utilizes high efficiency switched diffractive gratings to form optical switching, interconnection, and routing networks. The diffractive gratings are...
6456419 Frequency modulated liquid crystal beamsteering device  
An electrical exciting circuit produces a plurality of oscillating electrical excitations, each at an independently controllable frequency. A set of drive electrodes are distributed in an array,...
6445502 Variable blazed grating  
In one aspect of the invention, an apparatus operable to provide optical signal processing includes an inner conductive layer including an at least substantially conductive material and a plurality...
6421179 Wavelength division multiplexing system and method using a reconfigurable diffraction grating  
The present invention provides an improvement in a wavelength division multiplexer and/or a dense wavelength division multiplexer (WDM/DWDM) by incorporating an electronically reconfigurable...
6404553 Phase active diffractive optical method  
A method for effecting the desired optical characteristics of an optical system ( 10 ) using phase diffractive optics. Incident light (B i ) is directed onto a surface ( 12 i ) of a material ( 12 )...
6384959 Optical data modulation system with self-damped electromechanical conformal grating  
A system for modulating a beam of light in accordance with an input data stream having a data rate greater than 2 MHz, includes a source of light for directing light along a predetermined path, and...
6369948 Multilevel diffractive optical element  
A multilevel diffractive optical element comprising a base and a plurality of phase zones having phase levels of a substantially identical height h, each phase zone being defined by a local...
6359734 Surface pattern  
A surface pattern ( 1 ) has N visually recognizable patterns which are composed of optically diffractive, microscopically fine relief structures, plane mirror faces or absorbing or scattering...
6344298 Circumferentially varying mask and fabrication of fiber gratings using a mask  
A mask for forming gratings in an optical fiber has a pattern that is circumferentially varying about a central axis or region.
6335831 Multilevel mechanical grating device  
A mechanical grating device for improving the diffraction efficiency. The mechanical grating device is built on a base having a surface. Above the base a spacer layer, having an upper surface, is...
6314220 Segmented complex fiber gratings  
A waveguide that is operative to produce a reflected optical signal having a spectral profile corresponding to a product of a spectral profile of an input optical signal and a predetermined...
6307663 Spatial light modulator with conformal grating device  
A mechanical grating device for modulating an incident beam of light by diffraction includes an elongated element including a light reflective surface; a pair of end supports for supporting the...
6304364 Elastomeric light valves  
Electromagnetic radiation valves are provided. In one system, a transparent, elastomeric article is provided having a contoured surface including protrusions and intervening indentations. The...
6295145 Switchable holographic device  
A switchable holographic device generally comprises a substrate having two generally opposed surfaces and a plurality of holographic fringes recorded in the substrate. The holographic fringes are...
6295118 Optical arrangement for exposure apparatus  
An optical arrangement includes a diffractive optical element and a curvature control system for changing curvature of the diffractive optical element. The optical arrangement can be incorporated...
6292297 Multilevel diffractive optical element  
A multilevel diffractive optical element comprising a base and a plurality of phase zones having phase levels of a substantially identical height h, each phase zone being defined by a local...
Matches 51 - 100 out of 217 < 1 2 3 4 5 >