Matches 401 - 450 out of 744 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >
Match Document Document Title
6055107 Diffractive lens and preparation method thereof  
Method for the preparation of diffractive lens with one single etching step and using one single etching mask. While the widths and intervals of the masked areas of the photo masks are decided...
6055105 Optical system with grating element and imaging device using the same  
An optical system that can be used in an optical imaging system and displays good imaging performance with corrected chromatic aberration without increasing the number of lenses is provided by...
6043936 Diffractive structure on inclined facets  
6043912 Optical pickup compatible with a digital versatile disk and a recordable compact disk using a holographic ring lens  
An optical pickup apparatus compatible with at least two types of optical recording media, using light beams having respective different wavelengths for recording and reading information, the...
6040936 Optical transmission control apparatus utilizing metal films perforated with subwavelength-diameter holes  
Generally speaking, in accordance with the invention, an optical transmission modulation apparatus is provided for modulating light transmitted through the apparatus. The apparatus comprises a...
6038358 Alignment method and system for use in manufacturing an optical filter  
A photosensitive optical fiber being scanned by an ultraviolet beam to form an optical filter is aligned with the beam by detecting fluorescence produced in the fiber. The relative position of the...
6035083 Method for writing arbitrary index perturbations in a wave-guiding structure  
A method and an apparatus for writing arbitrary refractive index perturbations along an optical waveguide. The method includes the steps of providing a waveguide having a photosensitive region and...
6028705 Image reading apparatus with reflection type blazed diffraction grating for color separation  
A color image reading apparatus is provided wherein a color picture image is read out by a monolithic three line sensor through a reflection type one-dimensional blazed diffraction grating acting...
6023354 Semiconductor Bragg reflector and a method of fabricating said reflector  
A semiconductor Bragg reflector and to a method of fabricating it. The reflector comprises a plurality of stacked layers on a substrate of a III-V type material, one of the stacked layers forming a...
6021000 Beam splitting diffractive optical element  
Disclosed is a diffractive optical element which includes a diffractive grating pattern on a base plate. The diffractive grating pattern includes a plurality of phase gratings arranged in parallel...
6008942 Diffractive optical element and optical instrument having the same  
A diffractive optical element for diffracting non-collimated light includes a base surface and a periodic structure formed on the base surface and having a plurality of diffractive surfaces and a...
5995297 Zoom lens  
This specification discloses a zoom lens which has, in succession from the object side, a first lens unit of positive refractive power, a second lens unit having negative refractive power and...
5991078 Display medium employing diffraction grating and method of producing diffraction grating assembly  
A display medium employing a diffraction grating to define and represent a display pattern by the contour thereof, which enables the display pattern to move smoothly as the visual point moves and...
5986807 Single binary optical element beam homogenizer  
A binary diffractive optical element is used as a single element beam homogenizer. The phase profile of the binary surface relief phase grating structure of the binary diffractive optical element...
5982545 Structure and method for manufacturing surface relief diffractive optical elements  
A structure and method for manufacturing surface relief diffractive optical elements are disclosed in the invention, which combines surface relief grating structure and gradient refractive index....
5978140 Method for designing diffractive lenses  
The method for designing a diffractive lens to be formed on a refractive lens is disclosed. According to the method, a function of the diffractive lens is expressed as a polynomial optical path...
5978110 Holographic optical grating and method for optimizing monochromator configuration  
This invention comprises a novel apparatus for recording a holographic groove pattern on a diffraction grating blank. The recording apparatus is configured using newly developed groups of...
RE36352 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...
5969864 Variable surface relief kinoform optical element  
A kinoform optical element (KOE) has different surface relief heights in different zones of the kinoform surface, in order to optimize the first order diffraction efficiency in each zone. By...
5966244 Viewfinder optical system  
An eyepiece lens has a single lens element having a positive optical power, and the single lens element has a refractive power of an aspherical surface and a diffractive power. The eyepiece lens...
5963684 Multiple-wavelength optical transceiver  
An optical demultiplexing apparatus is capable of spatially separating a multiplexed optical signal into two or more optical wavelength signals thereof. An input multiplexed optical signal present...
5945967 Speckle depixelator  
A depixelator for improving the image generated by a pixelated image generator, using a non-periodic optic element, is provided. By providing a non-periodic optic element, artifacts such as moire...
5933277 Imaging system combining visible and non-visible electromagnetic radiation for enhanced vision  
An imaging system provides a visible image of a scene enhanced by information from electromagnetic radiation from the scene at a non-visible wavelength without parallax-induced errors. First...
5917845 Devices that produce a super resolved image for use in optical systems  
Superresolution elements which provide masks and are integrated into superresolution lenses, and in confocal imaging, optical disk and reprographic systems and laser pattern generation systems. The...
5914814 Telecentric laser beam optical focusing system of two diffractive optical elements  
A telecentric laser beam optical focusing system consists of two diffractive optical elements. The optical system has a spot size of less than one micron and a Strehl ratio of over 0.9 with a...
5914811 Birefringent grating polarizing beam splitter  
A birefringence polarizing beam-splitter is provided. A series of periodic blazed grooves or grooves with echelon profile having a number of steps is provided on the surface of an optically...
5912999 Method for fabrication of in-line optical waveguide index grating of any length  
A method and an apparatus for writing apodized Bragg gratings into an optical fiber. The method includes the steps of providing a photosensitive optical fiber and a writing beam. A periodic...
5909313 Multiple image diffractive device  
A pixellated diffractive device includes a multiplicity of pixels in turn divided into multiple sub-pixels. The device is related to one or more pixellated diffraction surface structures which when...
5909312 Phase-only filter for generating an arbitrary illumination pattern  
A phase-only filter for approximating a given optical transfer function for monochromatic incoherent light. The filter is designed by solving an integral equation for a phase function, and...
5907436 Multilayer dielectric diffraction gratings  
The design and fabrication of dielectric grating structures with high diffraction efficiency used in reflection or transmission is described. By forming a multilayer structure of alternating index...
5907435 Laser beam optical focusing system of two symmetrical diffractive optical elements  
A laser beam optical focusing system consists of two symmetrical diffractive optical elements. The optical system has a spot size of less than one micron and a Strehl ratio of over 0.9 with a...
5889280 Apparatus for measuring displacement  
A transmission type encoder is disclosed, which comprises a main scale, a light source that radiates collimated light to the main scale, and a photodiode array that also functions as an index...
5886798 Information carriers with diffraction structures  
An information carrier has at least one diffraction pattern which is formed from microscopically fine relief structures and which, upon being illuminated with coherent light, produces in two...
5861964 Method of manufacturing light beam scanning apparatus and fixed hologram plate and rotatable hologram and light distributing apparatus  
A high-resolution light-beam scanning apparatus utilizing only mass-producible holograms instead of utilizing auxiliary optical systems, and capable of compensating for disadvantages. The...
5853197 Security document  
A security document is provided comprising a substrate having a top surface for carrying indicia. The top surface has a plurality of areas. Each of the areas contains background printed matter on...
5838496 Diffractive multi-focal objective lens  
A diffractive multi-focal objective lens formed, macroscopically, as a double convex lens having convex aspherical surfaces of which radii of curvatures are larger as a function of distance from...
5828492 Grating structure having a plurality of binary lamellar gratings  
In a grating structure for use in a Fourier spectrometer with a series of raised and recessed surfaces of optical quality, a plurality of binary lamellar gratings are provided which have distinct...
5828491 Phase plate technology for laser marking of magnetic discs  
An advanced design for a phase plate enables the distribution of spots in arbitrarily shaped patterns with very high uniformity and with a continuously or near-continuously varying phase pattern. A...
5825547 Diffractive device for generating one or more diffracting images including a surface relief structure at least partly arranged in a series of tracks  
A diffractive device having a surface relief structure which, when illuminated by a light source, generates one or more diffraction images which are observable from particular ranges of viewing...
5825523 Linear beam steering device  
A device for linear beam steering, where a translation of one grating respective the other one results in an increased angular deviation of the light beam. The device includes at least one pair of...
5822091 Extreme depth-of-field optical lens and holographic projector system for its production  
A modulated index lens containing a subsurface zeroth order coherent microlenticular mosaic defined by an index gradient adds a normalizing function to the vergences or parallactic angles of...
5818634 Dual mode optical Magnifier system  
A dual mode optical magnifier system (22) including a plurality of multi-order diffractive optical elements (24) having at least one reflective, refractive and conventional diffractive surface...
5815293 Compound objective lens having two focal points  
A compound objective lens is composed of a hologram lens or transmitting a part of incident light without any diffraction to form a beam of transmitted light and diffracting a remaining part of the...
5812320 Optical encoder having high resolution  
An optical encoder is provided which is not affected by fluctuation of wavelength of a light beam due to temperature change, without sacrificing resolution of measurement. The optical encoder...
5812319 Sacrificial micro-gratings  
An arrangement and technique for reduced laser induced damage threshold (T) of a sacrificial optical element within an electro-optical system without increased system reflectivity. A sacrificial...
5812318 Apparatus and methods for routing of optical beams via time-domain spatial-spectral filtering  
Apparatus and methods are disclosed for spatially routing an optical pulse (data pulse) of an electromagnetic radiation and containing a specific address temporal profile and possibly additional...
5796520 Chromatic aberration correcting element and its application  
A chromatic aberration correcting element that is a simple lens having at least one aspheric surface the radius of curvature of which increases from the optical axis toward the periphery, at least...
5793910 Method and circuit arrangement for frequency stabilization of a WDM multiplexer/demultiplexer  
For frequency stabilization of a WDM multiplexer/demultiplexer with an optical phased array, a control signal with reference to which the WDM multiplexer/demultiplexer temperature is set is...
5786931 Phase grating and method of producing phase grating  
The phase grating of the present invention includes a substrate with a reflective, continuous layer disposed thereon on which a structured spacer layer 3 of dielectric material is applied. To form...
5784200 Difraction grating recording medium, and method and apparatus for preparing the same  
A hologram seal for security is prepared in pseudo manner by using a diffraction grating pattern. A picture data of a plurality of motifs is inputted to a computer. Within the computer, there are...
Matches 401 - 450 out of 744 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >