In the optical multiplexer, an optical diffusion element separates a first input beam from a first input port and a second input beam from a second input port into a plurality of wavelength components. A reflection mirror comprises first and second reflection elements. A first output port is provided in a propagation path for a reflected beam of the first input beam from the first reflection element, the reflected beam corresponding to a first wavelength band. A second output port is provided in a propagation path for a reflected beam of the first input beam from the second reflection element, the reflected beam corresponding to a second wavelength band. The second input port is disposed in a position where a third reflected beam, which is a reflected beam of the second input beam, from the second reflection element corresponding to the second wavelength band is optically coupled with the first output port and is outputted from the first output port.
SANYO-ONODA CITY PUBLIC UNIVERSITY CORPORATION (Japan)
Inventor
Sakurai, Yasuki
Nishitateno, Masashi
Takatou, Koki
Ito, Masahiro
Abstract
A liquid crystal device according to one aspect of the present disclosure comprises a liquid crystal layer and an electrode layer. The electrode layer is configured so as to form an electric field in the liquid crystal layer. The liquid crystal layer is composed of a liquid crystal composition obtained by adding, to a liquid crystalline mixture, a polymerization inhibitor for inhibiting radical polymerization caused by light action. Specifically, the liquid crystal layer is composed of a liquid crystal composition obtained by adding a hindered amine-based organic compound as a polymerization inhibitor.
G02F 1/13 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
C09K 19/54 - Additives having no specific mesophase
System and methods for Light Detecting and Ranging (LIDAR) are disclosed. The LIDAR system includes a light source configured to generate a tunable beam, an optical beam steering device positioned to receive at least a portion of the beam and configured to sweep the beam over a range of angles in a field of view (FOV) wherein each discrete frequency of the beam to a different angle in the FOV, a detector configured to generate an interference signal based on the received portions of the beam, and a processor communicably coupled to the detector. The processor is configured to cause the light source to tune the tunable beam from a first frequency to a second frequency and to calculate a range of an object corresponding to either the first frequency or the second frequency within the FOV.
System and methods for Light Detecting and Ranging (LIDAR) are disclosed. The LIDAR system includes a light source that is configured project a beam at various wavelengths toward a wavelength dispersive element. The wavelength dispersive element is configured to receive the beam and direct at least a portion of the beam into a field of view (FOV) at an angle dependent on frequency. The system also includes a detector that is positioned to receive portions of the beam reflected from an object within the FOV and a processor that is configured to control the light source and determine a velocity of the object.
G01S 17/88 - Lidar systems, specially adapted for specific applications
G01S 17/32 - Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
G01S 17/931 - Lidar systems, specially adapted for specific applications for anti-collision purposes of land vehicles
An optical system according to one aspect of the present disclosure is provided with: a first light source; a second light source; a first spatial light phase modulator; a second spatial light phase modulator; and a projector. The first spatial light phase modulator outputs first phase-modulated light based on incident light of a first wavelength from the first light source. The second spatial light phase modulator outputs second phase-modulated light based on incident light of a second wavelength from the second light source. The projector projects the first phase-modulated light and the second phase-modulated light onto an object. The first spatial light phase modulator is a liquid crystal device which comprises a first liquid crystal layer. The second spatial light phase modulator is a liquid crystal device which comprises a second liquid crystal layer. The first liquid crystal layer and the second crystal layer are configured from different liquid crystal materials.
G03B 21/00 - Projectors or projection-type viewersAccessories therefor
G02F 1/13 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
This substrate rotating device comprises a main rotating mechanism, a sub rotating mechanism, and a guide structure. The main rotating mechanism rotates about a first rotation axis. The main rotating mechanism comprises a sub rotation mechanism. The sub rotating mechanism revolves around the first rotation axis accompanying the rotation of the main rotating mechanism and rotates about a second rotation axis. The second rotation axis displaces in a radial direction with respect to the first rotation axis. The guide structure has a contact surface extending in the circumferential direction with respect to the first rotation axis. The guide structure controls the radial displacement of the second rotation axis and causes the sub rotating mechanism to revolve in a track along the contact surface when the contact surface and the sub rotating mechanism come into contact with each other.
H01L 21/68 - Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereofApparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components for positioning, orientation or alignment
SANYO-ONODA CITY PUBLIC UNIVERSITY CORPORATION (Japan)
Inventor
Sakurai, Yasuki
Takatou, Koki
Abstract
The liquid crystal device according to one aspect of the present invention is provided with a liquid crystal layer and an electrode layer configured so as to form an electric field in the liquid crystal layer. The liquid crystal layer is formed by a liquid crystal composition having added thereto, as a polymerization inhibitor, an organic compound having a property of inhibiting polymerization reactions that occur in a liquid crystalline mixture through light effects.
G02F 1/13 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
C09K 19/54 - Additives having no specific mesophase
A LIDAR sensing system includes a light source that is controlled to project a collimated beam at various wavelengths. An interferometer receives the collimated beam and projects an object beam corresponding to the collimated beam at a diffraction grating. The object beam is diffracted from the diffraction grating at different angles corresponding to the wavelength of the collimated beam, creating a two dimensional scan along a first axis. The object beam is also controlled along a second axis that is perpendicular to the first axis. As a result, the LIDAR sensing system generates a horizontal and vertical scan (e.g., a three-dimensional scan) of the external environment.
G01B 11/10 - Measuring arrangements characterised by the use of optical techniques for measuring diameters of objects while moving
G01B 11/14 - Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
G01C 3/02 - Measuring distances in line of sightOptical rangefinders Details
G01S 17/02 - Systems using the reflection of electromagnetic waves other than radio waves
9.
OPTICAL COHERENCE TOMOGRAPHY SYSTEM COMBINING TWO WAVELENGTHS
An optical coherence tomography (OCT) system combining multiple wavelengths is generally described. In an example, the OCT system includes a first light source configured to emit a first beam having a first wavelength. The OCT system further includes a second light source configured to emit a second beam having a second wavelength. The OCT system further includes an interferometer. The first beam and the second beam are configured to be directed into the interferometer. The interferometer includes a reference path and an interferometer sample path. The OCT system further includes a first beam splitter configured to divide, from an output of the interferometer sample path the first beam into a first sample path, and the second beam into a second sample path. The OCT system further includes a second beam splitter configured to combine the first beam and the second beam into a common axis.
Diagnostic devices are generally described. In an example, an improved diagnostic device includes a display, a camera, a diagnostic probe, and a control unit. The display includes an aperture. The camera is configured to capture an image of a patient through the aperture. The diagnostic probe is configured to perform measurements of an area of interest of the patient through the aperture. The control unit is configured to analyze the measurements of the diagnostic probe and cause the display to present the image of the patient and results of the measurements on the image of the patient.
External cavity lasers with single mode-hop-free tuning are generally described. In an example, an external cavity tunable laser system includes an external cavity, a substrate, a chirped grating reflector, and a tunable filter. The substrate has a gain region disposed on the substrate and also includes an active waveguide. The external cavity tunable laser system has a cavity length of the external cavity tunable laser system that is defined by at least a first length of the chirped grating reflector, a second length of the gain region, and a third length of the tunable filter. The cavity length also has an inherent external cavity longitudinal mode. Further, the tunable filter and the chirped grating reflector are configured to synchronize to the inherent external cavity longitudinal mode over a tuning range of the tunable filter.
H01S 3/10 - Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
Methods and devices for accurate noninvasive measurement of blood analyte concentrations are disclosed. In an example process, optical properties of a blood vessel proximate to the surface of an exposed body part, for example, the sclera or the backside of the eye lid, is measured. Analyte concentrations are determined based on the measured optical properties.
Improved optical coherence tomography (OCT) imaging systems are generally described. In an example, an OCT imaging system includes a tunable laser source, an interferometer, a splitter, and a detector. The tunable laser source is configured to provide a wavelength-scanned beam. The interferometer is configured to split the wavelength-scanned beam into a reference beam and an object beam. The splitter is configured to split the object beam into a first path corresponding to an anterior chamber imaging component and a second path corresponding to a retinal imaging component. The detector is configured to detect a signal caused by interference between the reference beam and at least a portion of the object beam reflected from the eye.
To provide a treatment agent for asbestos, which has a less influence on human body, the construction and the surrounding environment and can render the asbestos harmless evenly up to the inside of the bulky covering materials, which cover the wall, or the slate materials, and a treatment method of the asbestos using the same.
A treatment agent for asbestos, which contains phosphoric acid of 0.5 through 3.0% by weight, hydrogen peroxide of 1 through 20% by weight, alcohol of 0.5 through 20% by weight and pure water and a treatment method of the asbestos using the same are described.
In a wavelength selection element employed in an optically variable filter array apparatus, pixels in a line form are placed into a light reflection state so that wavelength-scanned light can be incident on the optically variable filter array apparatus. On the basis of the wavelength of scanned reflection light and the location of the pixel in a light reflection state at a timing of acquisition of output, the relationship between the x coordinate of the wavelength selection element and wavelength is determined. This makes it possible to achieve calibration of the optically variable filter array apparatus capable of selection of a desired wavelength with respect to a desired channel from multi-channel WDM light.
G02F 1/23 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour for the control of the colour
In a wavelength selective optical switch device that disperses a WDM light beam according to their wavelengths. Dispersed light beams is applied to a wavelength selecting element. Incident light beams are separately reflected in different directions according to their wavelengths by use of the multi-level optical phased array. In the optical phased array, even when the number of multi levels is small, by setting the maximum phase shift amount of the phased array to be at least 1.5 π and less than 2.0 π, wavelength dependence is reduced, thereby reducing crosstalk. In this manner, the wavelength dependence, in turn, crosstalk can be reduced.
Light from an optical fiber is incident on a frequency dispersion element. The frequency dispersion element disperses the incident light into light beams in different directions according to their frequencies and directs the dispersed light beams to a lens. The lens develops the incident light beams over an xy plane according to their frequencies in a strip-like form. A frequency selective element has pixels arranged in a frequency dispersion direction and brings pixels located at positions corresponding to the frequency to be selected into a reflective state. A light beam selected by the frequency selective element is emitted from an optical fiber through the same path. By changing reflection characteristics of the frequency selective element according to each pixel, optical filter characteristics can be desirably changed so as to achieve change of passband width and frequency shift.
G02F 1/13 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
A multiple input/output wavelength selective switch device 1 is configured of an N×M optical cross connect switch 10, wavelength selector 20 and controller 40. The N×M optical cross connect switch 10 turns WDM signals of N channels inputted to input routes Rin1 to RinN into M WDM signals. The wavelength selector 20 can perform a selection operation with respect to each of the M WDM signals according to their wavelengths and output the signals from output routes Rout1 to RoutM.
m. By changing reflection characteristics of wavelength selection element on a pixel-by-pixel basis, desired wavelengths of given WDM light can be selected.
H04J 14/02 - Wavelength-division multiplex systems
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
m. By changing reflection characteristics of wavelength selection element 19 on a pixel-by-pixel basis, characteristics of optical filter can be varied, so that desired wavelengths of given WDM light can be selected.
H04J 14/02 - Wavelength-division multiplex systems
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
21.
ASBESTOS-TREATING AGENT AND METHOD FOR TREATING ASBESTOS
Provided is an asbestos-treating agent and a method for treating asbestos, having a small effect on the human body, buildings, and the surrounding environment, and with which a treatment for making asbestos harmless can be conducted uniformly even to the inside of thick walls and slates. Disclosed is an asbestos-treating agent containing 0.5-3.0% by weight of phosphoric acid, 1-20% by weight of hydrogen peroxide, 0.5-20% by weight of an alcohol, and pure water. Also disclosed is a method for treating asbestos using same.
x. By moving the mirror substrate 15 toward a direction different from a distribution direction of the belt-shaped lights, only the light of any one of wavelengths is reflected. Then, the light returning to the refractive diffraction grating 13 is reflected to an incident direction of the original light. Accordingly, a tunable filter which is able to select a light of an arbitrary wavelength by moving the mirror substrate 15 can be realized.
A tunable light source 10 for varying emission wavelength periodically and an optical interferometer are used. A reflector is disposed at a measurement position, a light interference signal is A/D converted at a regular time interval, and data numbers at timing giving peak and bottom are calculated according to a least-squares method. Based on this, an approximate equation is calculated according to polynomial approximation and a sequence including the number of exponentiation of 2 and converting the data number at a regular frequency interval is calculated. Then, by disposing a measured target at the measurement position, calculating the necessary number of pieces of data for FFT from measured data at each timing according to straight-line approximation and Fourier transforming a light beat signal obtained by an optical interferometer at regular frequency interval, a tomogram having high resolution and high sensitivity can be acquired.
A surface emission laser light source is used as a tunable laser light source. Since the surface emission laser light source can realize a broad frequency scanning range at a high speed and in the single mode, a coherent length is longer than that of a multi mode light source. For this reason, when a tomography image is calculated by executing the Fourier transform for an output obtained from an interference optical device, measuring depth can be deepened.
patents
