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6950384 |
Optical pickup appratus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a...
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6947213 |
Diffractive optical element that polarizes light and an optical pickup using the same
A first diffractive optical element pattern with a pattern pitch that is no greater than a wavelength of incident light is formed on a first main surface of substrate such as a glass plate. Second...
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6947204 |
Compact wavelength selective switching and/or routing system
Compact systems with reduced insertion loss, and increased switch isolation and switching speed. The switching and/or routing devices utilize a separating sub-system, a switching and/or routing...
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6943952 |
Optical security component
An optical security component for authenticating a document or a product including a transparent plastic film embossed to form an embossed surface and to have at least one diffraction grating; a...
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6940650 |
Diffraction optical element and transfer mold therefor
A diffraction optical element including an element body having a large number of grooves formed on its surface to form a grating, and a grating shape adjusting layer deposited on a grating surface...
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6930053 |
Method of forming grating microstructures by anodic oxidation
A method of manufacturing an element having a microstructure of an excellent grating groove pattern or the like is obtained. This method of manufacturing an element having a microstructure...
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6927914 |
Grism
In order to achieve highly dispersive spectrometry in wide wavelength with the use of a single grism, but not a plurality of grisms, the grism is composed of a prism the vertex angle of which can...
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6927913 |
Optical signal processing apparatus
An optical signal processing apparatus has a diffraction grating element, first condenser lens, Faraday rotation elements, polarization beam splitter, λ/2 plate, second condenser lens, third...
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6924934 |
Diffractive safety element
A security element ( 2 ) comprising a plastic laminate ( 1 ) has a surface pattern which is composed mosaic-like at least from surface elements, wherein in the surface elements a reflecting...
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6922286 |
Off-axis diffractive beam shapers and splitters for reducing sensitivity to manufacturing tolerances
A diffractive element used in conjunction with a grating to move a desired order beam off-axis, thereby reducing interference by undesired orders. Use of the off-axis grating allows a more uniform...
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6922287 |
Light coupling element
A light coupling element is proposed with a surface ( 3 ) of a material which is transparent to light of a given wavelength (λ). In order for the light coupling element to act independently of the...
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6919983 |
Microelectromechanical device with continuously variable displacement
An electrostatic micromechanical device with continuously variable displacement, that includes: a movable member having a first electrode; an opposing surface having a second electrode; a channel...
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6917454 |
Holographic optical element, position shift detecting apparatus, optical pickup apparatus, optical recording medium drive and method of fabricating holographic optical element
In a holographic pattern provided in a holographic optical element, a pattern 1 a twists a diffracted light beam in a clockwise direction, to form a semi-circular light spot Sa on photodetection...
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6917472 |
Achromatic fresnel optics for ultraviolet and x-ray radiation
An achromatic Fresnel optic that combines a Fresnel zone plate and a refractive Fresnel lens. The zone plate provides high resolution for imaging and focusing, while the refractive lens takes...
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6913365 |
Light diffusive protective film
A light diffusive protective film for a surface light source device for protecting other base material and improving the luminance of information display is disclosed which comprises a transparent...
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6909546 |
Multipoint lump homogenizing optical system
When a Gaussian power distribution laser beam is converted into a uniform power density beam by a converging homogenizing DOE and is divided into a plurality of homogenized beams by a diverging...
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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;...
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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...
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6900939 |
Polarization insensitive beam splitting grating and apparatus using it
A beam splitting element having a diffraction grating is designed by careful selection of device parameters such as grating period, duty cycle, depth and refractive index. In particular, the...
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6900932 |
Optical gain flattening filter using VPG-based optical elements
An optical gain flattening filter for attenuating the wavelength power levels of an optical beam to a threshold value. The filter has a series of volume phase gratings which each have a loss...
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6898009 |
Diffractive display
The present invention is directed to an improvement in a diffractive display suitable for presenting graphic and the like displays. Broadly, a novel embodiment is realized from a holographic...
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6894837 |
Imaging system for an extreme ultraviolet (EUV) beam-based microscope
Imaging system for a microscope based on extreme ultraviolet (EUV) radiation. The present invention is directed to a reflective imaging system for an x-ray microscope for examining and object in an...
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6892002 |
Stacked planar integrated optics and tool for fabricating same
In a method of making a replication tool, replication parts for both two dimensional optical elements, such as are fabricated using micro-forming techniques, and three dimensional optical elements,...
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6891147 |
Wavelength-selective diffraction element and an optical head device
An optical head device having an optical element capable of transmitting without diffracting light having a wavelength emitted from a two-wavelength semiconductor laser and capable of diffracting...
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6891675 |
Optical device
There is disclosed an optical device in which a first light source for outputting a first wavelength light is apart from a second light source for outputting a second wavelength light by a...
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6888653 |
Optical scanning device
In an optical scanning device 1 , a housing 3 has a space 3 a in the inside thereof. A floating rotational plate 2 is housed in the space 3 a , and is caused to float and to rotate by a...
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6870678 |
Surface pattern
A surface pattern ( 18 ) is in the form of a visually visible mosaic comprising a number of surface portions ( 8; 9; 15; 16; 17 ) and is embedded in a laminate ( 1 ) comprising at least a...
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6865025 |
Aberration compensating optical element, optical system, optical pickup device, recorder and reproducer
An aberration compensating optical element includes: a diffractive structure having a plurality of ring-shaped zone steps formed into substantially concentric circles on at least one surface of the...
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6860650 |
Assembly for aligning an optical array with optical fibers
An electro-optical converter assembly is described. The electro-optic converter includes an optically transparent substrate with a plurality of alignment apertures and an optical device disposed on...
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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...
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6847754 |
Coordinated axis seeks with a micro-electro-mechanical mirror
A method of moving a MEM system mirror in a well defined trajectory that allows longer seeks to be used to reach a target position as compared with known methods that employ small step sizes due to...
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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...
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6842286 |
Optical system and methods that compensate for changes in atmospheric conditions
Optical systems are provided. One such optical system includes an optical source that propagates a source beam of light. A diffracting component is optically coupled to the optical source and is...
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6833955 |
Compact two-plane optical device
An optical device for enlarging an eye box, the optical device comprising: (a) a first optical expander being carried by, or formed in, a first light-transmissive substrate engaging a first plane;...
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6833954 |
Lithographic method for manufacturing a mask used in the fabrication of a fiber Bragg grating
The invention reduces the effects of stitching errors from re-scaling or re-positioning in the fabrication of fiber Bragg gratings or the mask used in such fabrication. A first embodiment of the...
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6832022 |
Rectangular response optical filter for partitioning a limited spectral interval
The invention concerns a rectangular response optical filter for partitioning a limited spectral interval in a light flux with large spectrum comprising: a preferably monomode input optical fiber...
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6831783 |
Diffractive optical element and optical system
A diffractive optical element includes a first layer having a relief-type grating, a second layer having a relief-type grating, and a third layer having a relief-type grating. The first, second and...
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6829096 |
Bi-directional wavelength division multiplexing/demultiplexing devices
A bi-directional wavelength division multiplexing/demultiplexing device is disclosed. In an exemplary embodiment, the bi-directional wavelength division multiplexing/demultiplexing device comprises...
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6829090 |
Prism, projection device and optical component
A prism optimally separating and synthesizing a light beam of a wide angle of incidence. A diffraction prism 15 of the present invention is so constructed that a diffraction grid 21 is...
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6825981 |
Optical signal processor
The present invention relates to an optical signal processor which can multiplex or demultiplex multiwavelength signal light. The optical signal processor includes an optical input/output...
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6822795 |
Dynamic image device with diffractive optical element
Invisible different monochromatic images are inscribed in a diffractive optical element. Each of the images appears when a specific light source is on and image disappears when the specific light...
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6819490 |
Homogenization of a spatially coherent radiation beam and printing and inspection, respectively, of a pattern on a workpiece
The present invention relates to a device for homogenizing the spatial intensity distribution of a spatially coherent radiation beam. The device includes a grating arranged in the propagation path...
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6819491 |
Objective lens unit for optical pickup, optical pickup and disc driving device
An objective lens unit for an optical pickup used for recording and/or reproducing information signals from an optical disc. The objective lens unit includes a resin layer ( 21 ) having,...
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6819835 |
Tunable filter device
A tunable filter device ( 10 ) has a plurality of input waveguide channels ( 141, 142, 143 ), a plurality of output waveguide channels ( 161, 162, 163 ) and a Bragg grating ( 13 ) which are formed...
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6815065 |
All-dielectric optical diffractive pigments
All-dielectric diffractive pigment flakes can be applied to an object to impart a diffractive effect to the object without substantially changing the background color of the object. In one case,...
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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...
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6813080 |
Metal-free gratings for wavelength-multiplexed optical communications
The invention is directed to metal-free grating for use in wavelength optical communications, and in particular to metal-free, reflective immersed diffraction gratings. The gratings of the...
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6813079 |
Fabricating optical waveguide gratings
A method of fabricating an optical waveguide grating having a plurality of grating lines of refractive index variation comprises the steps of: (i) repeatedly exposing a spatially periodic writing...
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6809864 |
Multi-layer structure with variable bandpass for monochromatization and spectroscopy
A grating that includes a multilayer structure that has alternating layers of materials, a plurality of grooves formed between a plurality of lands, wherein at least one structural parameter of the...
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6798574 |
Prism diffuser for diffracting and spreading light
The present invention relates to a prism diffuser for diffracting and spreading light, and in particular to a prism diffuser for diffracting and spreading light which is capable of spreading light...
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