Matches 301 - 350 out of 744 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >
Match Document Document Title
6501600 Polarization independent grating modulator  
A fiber-optic modulator based on a micromachined grating device which is both polarization independent and achromatic in behavior is described. The device is a two dimensional grating or periodic...
6496310 Optical system and optical apparatus provided with the same  
An optical system includes a diffractive optical element in which a phase given to incident light from an optical axis toward the peripheral part in the radial direction is not reversed in an...
6493143 Diffractive optical element and optical system incorporating the same  
A diffractive optical element, as well as an optical system incorporating the same, has a comparatively large minimum grating pitch and, hence, is easy to produce. The diffractive optical element...
6490089 Diffraction grating with reduced polarization-dependent loss  
A diffraction grating that achieves high diffraction efficiency at all polarizations for optical signals at telecommunications wavelengths is provided. The diffraction grating has a substrate and a...
6487018 Aperture and optical device using the same  
An aperture used in an optical device includes a first light-transmitting region which transmits light emitted from a light source which is provided in the optical device, and a second...
6487017 Trimodal microlens  
A trimodal microlens configuration is provided for the lenses in a microlens array utilized as a diffraction separator for generating separated bands of different color when the microlens array is...
6487015 Diffraction grating having multiple gratings with different cycles for generating multiple beams and optical pickup using such diffraction grating  
A diffraction grating for generating a plurality of beams includes a plurality of gratings. The plurality of gratings are formed to have an axis of symmetry perpendicular to the direction in which...
6483965 Method of writing a bragg diffraction grating  
A method of writing a diffraction grating into a photosensitive optical transmission medium is disclosed, in which a first phase mask is used to generate an interference pattern in a second phase...
6480333 Diffractive optical elements on non-flat substrates using electron beam lithography  
The present disclosure describes a technique for creating diffraction gratings on curved surfaces with electron beam lithography. The curved surface can act as an optical element to produce flat...
6480332 Diffractive optical element and optical system having the same  
In a diffractive optical element having a diffraction grating formed at an interface between different substances, a total sum of values obtained by multiplying rates of change in refractive index...
6476968 Optical element  
Disclosed is an optical element including a substrate made of a monocrystal of a fluoride compound, and a fine structure formed on the substrate and made of a non-monocrystal of metal fluoride....
6473233 Multi-beam optical system  
A multi-beam optical systems forms a plurality of beam spots on an object surface to be exposed. The system includes a light source that emits a light beam having a plurality of peak wavelengths, a...
6473232 Optical system having a diffractive optical element, and optical apparatus  
An optical system includes a diffractive optical element having a diffraction grating provided, on a lens surface having a curvature, in a concentric-circles shape rotationally-symmetrical with...
6469831 Multibeam optical system  
A multibeam optical system that employs a laser source emitting a laser beam, a diffractive beam-dividing element that diffracts the laser beam emitted from the laser source to be divided into a...
6466371 Diffractive lens with gratings modified to offset effects caused by holding the lens at an angle with respect to a light source  
A diffractive lens constructed in accordance with the invention comprises a set of bands such that the diffractive gratings in each band are modified. This is done to ensure that even if the lens...
6462875 Diffractive optical element  
A diffractive optical element has a plurality of step-like patterns each having surface levels of a number less than eight, the step-like patterns being disposed in combination to provide a...
6462874 Optical systems employing stepped diffractive surfaces  
Optical systems employing stepped diffractive surfaces ( 13 ) are provided. Ray tracing through such systems is performed using the grating equation to represent the stepped diffractive surface...
6452698 Transparent and semitransparent diffractive elements, particularly holograms and their making process  
Transparent and semitransparent diffractive elements, particularly holograms with a diffractive pattern created at least in one of two following layers with different index of refraction: a...
6452132 Laser hole boring apparatus  
A laser hole boring apparatus comprising a galvanomirror beam scanning system, a DOE beam diffraction system and a selecting device for the two systems optionally. The DOE system bores many holes...
6449097 Diffraction grating for wavelength division multiplexing/demultiplexing devices  
An improved diffraction grating for wavelength division multiplexing/demultiplexing devices is disclosed. The improved diffraction grating has a glass substrate, a polymer grating layer located...
6441962 Optical filter with little variation in chromatic dispersion  
An optical filter has little variation in chromatic dispersion over its passband, the filter being constituted by a Bragg grating whose pitch varies as a function of distance along the filter with...
6429972 Diffraction lens  
A diffractive lens, comprises an optical axis; a lens surface having a peripheral portion, and a diffractive relief provided on the lens surface, wherein the diffractive relief is shaped in annular...
6417968 Diffractive surface pattern  
A surface pattern is made up of surface elements ( 1 to 7 ) which are arranged in a mosaic-like fashion and which have microscopic relief structures. The surface elements ( 2 to 6 ) which are...
6417967 System and method for efficient illumination in color projection displays  
An illumination system for a color projection display. In one embodiment a broad spectrum light source illuminates a multilevel optical phase element which disperses the broad spectrum light from...
6414764 Ring interferometer configuration for writing gratings  
A method and apparatus is disclosed for creating a structure, such as a grating ( 45 ) in a photosensitive material ( 40 ). The method and apparatus relies upon creating at least two coherent beams...
6408116 Light guide path element and optical pickup  
The light beam emitted by the light source is irradiated on the information storage medium via the optical system. The reflected light beam is irradiated by the light guide path element. Then by...
6407869 External cavity type light source  
An external cavity type light source which has a semiconductor laser ( 1 ) coated on one end ( 1 a ) with a reflection prevention film ( 1 A), wherein emitted light from the end face of the...
6400509 Apparatus and method for the reduction of polarization sensitivity in diffraction gratings used in fiber optic communications devices  
A diffraction grating for use in multiplexing and demultiplexing optical signals in optical communication systems having reduced polarization sensitivity has a plurality of grooves including...
6392806 Efficient illumination system for color projection displays  
A method and system for providing an improved color image wherein a broad spectrum light is supplied to a phase grating which provides dispersed light having multiple diffraction orders. The...
6392805 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...
6391528 Methods of making wire grid optical elements by preferential deposition of material on a substrate  
A method for making wire grid optical elements by preferentially depositing material on a substrate is disclosed. Material can be preferentially deposited by directing an electromagnetic...
6381079 Optical system and optical apparatus having the same  
An optical system includes, in order from an object side to an image side, a first lens unit of positive optical power, and a second lens unit of negative refractive power, wherein focusing from an...
6381069 Fiber Bragg grating optical filter with a constant group-delay response in its working band  
The invention relates to the field of optical fiber wavelength division multiplexed transmission, and more particularly to the field of narrow-band optical filters for dense multiplexing. The...
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...
6366405 Diffractive-refractive achromatic lens  
A diffractive-refractive achromatic lens that has a positive resultant power includes a refractive lens system and a positive diffractive grating. The refractive lens system is provided with a...
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...
6356674 Electrically controllable grating, and optical elements having an electrically controllable grating  
An electrically controllable grating is provided by forming regions 4 and 5 of different refractive index within an electro-optic material. Electrodes are provided so that a readily...
6356389 Subwavelength optical microstructure light collimating films  
A light collimating film has a sheeting having a first side and a second side, wherein the first side includes a series of prisms, and the second side includes a plurality of subwavelength optical...
6351334 Reflective diffraction grating for use in display devices  
A reflective-type diffraction grating structure for use in color display devices such as liquid crystal displays (LCDs). It contains: (1) a plurality of micro-lenses each having a smooth top...
6349004 Head mounted display viewing optics with improved optical performance  
A lens design form is used for a viewing optical system or magnifier that includes a cemented doublet and a weak aspheric element, for example, made of acrylic, and having a diffractive kinoform...
6348999 Micro relief element and preparation thereof  
A micro relief element which comprises a) a first layer of a first substrate, the first layer having a receptive surface capable of retaining a relief forming polymer; b) an overlay of a desired...
6347171 Method and apparatus for forming a diffraction grating  
A method for forming a diffraction grating in an optical fiber. First and second ultrashort laser pulses are generated. The first and second ultrashort laser pulses are directed to intersect and...
6342976 Luminous flux diameter variable type objective lens and optical apparatus using the same  
A luminous flux diameter variable type objective lens having a wavelength selectivity is disposed within a luminous flux. Arranged on a surface of the lens are a first region 11 with no...
6342969 Multiple image diffractive device  
A pixellated diffractive device includes a multiplicity of pixels ( 12,22 ) in turn divided into multiple sub-pixels ( 13,23 ). The device is related to one or more pixellated diffraction surface...
6330109 Optical system comprising a diffractive optical element, and method of designing the same  
The invention relates to a method of easily and quantitatively determining the diffraction efficiency of a relief type diffraction optical element, and provides a method of designing an optical...
6327086 Optical diffraction device and exposure apparatus  
A binary-type optical diffraction device having the excellent capability of antireflection includes a step structure by which lens elements of a Fresnel lens are approximated. The surface of the...
6317226 Dot matrix hologram for hiding a moire pattern  
A moire pattern technology about a dot matrix hologram for hiding a moire pattern is invented. In the moire pattern hidden region of a dot matrix hologram, the moire pattern foreground area and the...
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...
6313948 Optical beam shaper  
An optical beam shaper for production of a uniform sheet of light for use in a parts inspection system having a light source including a coherent light generator, a diffractive beam shaper, and...
6310724 Image display apparatus  
To effectively make a mesh of out lines between pixels by a pixel diffusion and at the same time to facilitate a focusing of an image by the observer, an optical filter for diffusing each pixel of...
Matches 301 - 350 out of 744 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >