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1
US20190059717A1
Publication/Patent Number: US20190059717A1
Publication date: 2019-02-28
Application number: 16/170,612
Filing date: 2018-10-25
Inventor: Yoshioka, Takeshi  
Abstract: An optical amplifier includes a laminated body including two electrode layers and an active layer disposed therebetween. The laminated body includes a waveguide which guides light in an in-plane direction of the active layer. The light which is incident on the laminated body is amplified and emitted from an end surface in the in-plane direction through the waveguide. At least one of the two electrode layers has an electrode group including at least two electrodes which are disposed separately from each other in a waveguide direction of the waveguide. An amplification factor of the incident light is changeable in accordance with a wavelength of the incident light by independently supplying current to different regions in the active layer using the at least two electrodes. Accordingly, the ASE light including light having an unrequired wavelength may be reduced while sufficient light output intensity is obtained in a required wavelength. An optical amplifier includes a laminated body including two electrode layers and an active layer disposed therebetween. The laminated body includes a waveguide which guides light in an in-plane direction of the active layer. The light which is incident on the laminated body is ...more ...less
2
US20190011247A1
Publication/Patent Number: US20190011247A1
Publication date: 2019-01-10
Application number: 16/111,665
Filing date: 2018-08-24
Abstract: A phase-resolved heterodyne shearing interferometer has been developed for high-rate, whole field observations of transient surface motion. The sensor utilizes polarization multiplexing and multiple carrier frequencies to separate each segment of a shearing Mach-Zehnder interferometer. Post-processing routines have been developed to recombine the segments by extracting the scattered object phase from Doppler shifted intermediate carrier frequencies, providing quantitative relative phase changes and information to create variable shear, phase resolved shearographic fringe patterns without temporal or spatial phase shifting. A phase-resolved heterodyne shearing interferometer has been developed for high-rate, whole field observations of transient surface motion. The sensor utilizes polarization multiplexing and multiple carrier frequencies to separate each segment of a shearing Mach-Zehnder ...more ...less
3
US20190011250A1
Publication/Patent Number: US20190011250A1
Publication date: 2019-01-10
Application number: 16/067,337
Filing date: 2017-01-20
Assignee: 3SHAPE A/S
Abstract: Disclosed is an optical coherence tomography scanner and a method for recording sub-surface scans of an object, wherein a position encoder is arranged in the path of the probing beam of an interferometric system. The encoder pattern is detected in a sequence of A scans at generated for different probing beam positions on the scanned object, the probing beam position and/or inclination for at least one A scan of said sequence of A scans is deducing based on the detected encoder pattern, and the sub-surface scan of the object is generated based on the sequence of A scans taking into account the deduced probing beam position and/or inclination. Disclosed is an optical coherence tomography scanner and a method for recording sub-surface scans of an object, wherein a position encoder is arranged in the path of the probing beam of an interferometric system. The encoder pattern is detected in a sequence of A scans at ...more ...less
4
US20190041186A1
Publication/Patent Number: US20190041186A1
Publication date: 2019-02-07
Application number: 16/055,125
Filing date: 2018-08-05
Inventor: Olszak, Artur  
Abstract: Interference fringes in a bullseye pattern are produced by a measurement module by interfering a flat reference beam with a spherical beam reflected by a sphere connected to the tip of a probe in point contact with a test object. The bullseye interferogram is registered at a detector and analyzed conventionally to produce a position measurement of the tip of the probe. A beam correction module is used to align the bullseye interferogram with the illumination axis of the measurement module. By combining at least three such measurement modules in a coordinate measurement machine, the three-dimensional position of the probe and of its point contact with the test object can be obtained from analysis of the bullseye interferograms registered by the detectors with high precision and greatly reduced Abbe error. Interference fringes in a bullseye pattern are produced by a measurement module by interfering a flat reference beam with a spherical beam reflected by a sphere connected to the tip of a probe in point contact with a test object. The bullseye interferogram is registered at a ...more ...less
5
US20190056214A1
Publication/Patent Number: US20190056214A1
Publication date: 2019-02-21
Application number: 16/075,934
Filing date: 2017-02-10
Abstract: Various systems and methods for sequential angle illumination to achieve ultra-high resolution optical coherence tomography (OCT) images. One example OCT system includes a light source, a beam divider, sample arm optics, a detector, and a processor. The light source generates a light beam to illuminate the sample. The beam divider separates the light beam into reference and sample arms. The sample arm optics sequentially illuminates a location in the sample with the light beam from different angles. The detector receives light returned from the reference arm and the sample illuminated at each angle and generates signals. The processor combines the signals to generate an image, which has a transverse resolution that is higher than the transverse resolution achieved from the signal generated from a single angle. Various systems and methods for sequential angle illumination to achieve ultra-high resolution optical coherence tomography (OCT) images. One example OCT system includes a light source, a beam divider, sample arm optics, a detector, and a processor. The light source generates a ...more ...less
6
US20190072375A1
Publication/Patent Number: US20190072375A1
Publication date: 2019-03-07
Application number: 16/010,538
Filing date: 2018-06-18
Inventor: Osawa, Kentaro  
Assignee: HITACHI, LTD.
Abstract: An optical image measuring apparatus according to the present invention includes an optical branching unit that branches light emitted from a light source into a signal light and a reference light, and an optical scanning unit that scans an angle of an optical axis emitted from the light source is disposed between the light source and the optical branching unit. An optical image measuring apparatus according to the present invention includes an optical branching unit that branches light emitted from a light source into a signal light and a reference light, and an optical scanning unit that scans an angle of an optical axis emitted from ...more ...less
7
US20190063910A1
Publication/Patent Number: US20190063910A1
Publication date: 2019-02-28
Application number: 16/074,470
Filing date: 2017-05-11
Inventor: Feng, Qibo   Yang, Jing  
Abstract: A laser measurement system and method for measuring a six-degree-of-freedom geometric error of a rotating shaft includes a laser emission unit, a six-degree-of-freedom error measurement unit, a six-degree-of-freedom error sensing unit and a servo tracking unit capable of being installed on the rotating shaft to be measured, in which the error measurement unit enables light to be emergent from the error sensing unit and generates a measuring signal according to emergent light and reflected light and backward reflected light of the error sensing unit, and the servo tracking unit includes a four-dimensional adjustment mechanism for realizing four-dimensional adjustment; a motor fixedly installed on the adjustment mechanism; an angle measurement sensor for measuring a rotation angle of the motor; an installation plane fixed on the adjustment mechanism, coaxially rotating with the motor and used for installing the error sensing unit; and a control circuit for controlling the servo tracking unit according to the measurement signal from the six-degree-of-freedom error measurement unit. A laser measurement system and method for measuring a six-degree-of-freedom geometric error of a rotating shaft includes a laser emission unit, a six-degree-of-freedom error measurement unit, a six-degree-of-freedom error sensing unit and a servo tracking unit capable of being ...more ...less
8
US20190064070A1
Publication/Patent Number: US20190064070A1
Publication date: 2019-02-28
Application number: 15/989,886
Filing date: 2018-05-25
Inventor: Ragan, Timothy  
Abstract: In accordance with preferred embodiments of the present invention, a method for imaging tissue, for example, includes the steps of mounting the tissue on a computer controlled stage of a microscope, determining volumetric imaging parameters, directing at least two photons into a region of interest, scanning the region of interest across a portion of the tissue, imaging a plurality of layers of the tissue in a plurality of volumes of the tissue in the region of interest, sectioning the portion of the tissue, capturing the sectioned tissue, and imaging a second plurality of layers of the tissue in a second plurality of volumes of the tissue in the region of interest, and capturing each sectioned tissue, detecting a fluorescence image of the tissue due to said excitation light; and processing three-dimensional data that is collected to create a three-dimensional image of the region of interest. Further, captured tissue sections can be processed, re-imaged, and indexed to their original location in the three dimensional image. In accordance with preferred embodiments of the present invention, a method for imaging tissue, for example, includes the steps of mounting the tissue on a computer controlled stage of a microscope, determining volumetric imaging parameters, directing at least two photons into a ...more ...less
9
US20190049662A1
Publication/Patent Number: US20190049662A1
Publication date: 2019-02-14
Application number: 15/942,908
Filing date: 2018-04-02
Abstract: The invention relates to a supercontinuum light source comprising a microstructured optical fiber and a pump light source. The microstructured optical fiber comprises a core and a cladding region surrounding the core, as well as a first fiber length section, a second fiber length section and an intermediate fiber length section between said first and second fiber length sections. The first fiber length section comprises a core with a first characteristic core diameter. The second fiber length section comprises a core with a second characteristic core diameter, smaller than said first characteristic core diameter, where said second characteristic core diameter is substantially constant along said second fiber length section. The intermediate length section of the optical fiber comprises a core which is tapered from said first characteristic core diameter to said second characteristic core diameter over a tapered length. The invention relates to a supercontinuum light source comprising a microstructured optical fiber and a pump light source. The microstructured optical fiber comprises a core and a cladding region surrounding the core, as well as a first fiber length section, a second fiber ...more ...less
10
US20190025042A1
Publication/Patent Number: US20190025042A1
Publication date: 2019-01-24
Application number: 16/039,822
Filing date: 2018-07-19
Abstract: An optical coherence tomography (OCT) system for imaging a sample is provided. The OCT system includes an optical circuit and a digitization circuit. The optical circuit includes an interferometer and is configured to probe the sample and generate an analog OCT signal representative of the sample. The digitization circuit includes a frequency down converter and an analog-to-digital converter. The digitization circuit is configured to receive, down convert and digitize the analog OCT signal, thereby outputting a digitized down converted signal. A method for imaging a sample is also provided. The method includes steps of optically probing the sample to generate the analog OCT signal representative of the sample and processing the analog OCT signal to obtain the digitized down converted signal. An optical coherence tomography (OCT) system for imaging a sample is provided. The OCT system includes an optical circuit and a digitization circuit. The optical circuit includes an interferometer and is configured to probe the sample and generate an analog OCT signal ...more ...less
11
US20190025155A1
Publication/Patent Number: US20190025155A1
Publication date: 2019-01-24
Application number: 16/144,277
Filing date: 2018-09-27
Abstract: The system and methods are made to apply interferometry to ophthalmic applications. The system makes use of a low-coherence interferometer to obtain a plurality of measurements of a contacts lens. The system and methods characterizes the surface profile of both surfaces of a contact lens, a thickness profiles, and combines these measurements with an index information to reconstruct a complete model of the contact lens. The system and methods are made to apply interferometry to ophthalmic applications. The system makes use of a low-coherence interferometer to obtain a plurality of measurements of a contacts lens. The system and methods characterizes the surface profile of both surfaces of a ...more ...less
12
EP3427003A1
Publication/Patent Number: EP3427003A1
Publication date: 2019-01-16
Application number: 17709074.3
Filing date: 2017-03-07
13
EP3436768A1
Publication/Patent Number: EP3436768A1
Publication date: 2019-02-06
Application number: 17716008.2
Filing date: 2017-04-03
14
EP3444191A1
Publication/Patent Number: EP3444191A1
Publication date: 2019-02-20
Application number: 18193178.3
Filing date: 2015-02-27
Abstract: A processing station for registering a piece of passenger's luggage for a trip, wherein the processing station comprises: an injector for receiving the piece of luggage associated with the passenger; at least one sensor associated with the injector, the at least one sensor, in combination with at least the floor of the injector, creating a zone around the piece of luggage; and a controller associated with the sensor being adapted to: monitor, via the at least one sensor, intrusions through the zone to determine one or more of whether a predetermined limit on dimensions of the piece of luggage has been exceeded or whether a foreign object has intruded the zone from outside, and allow further processing of the piece of luggage only if no intrusion of the zone is detected; and wherein the controller adjusts the area of the zone to accommodate different sizes of luggage. A processing station for registering a piece of passenger's luggage for a trip, wherein the processing station comprises: an injector for receiving the piece of luggage associated with the passenger; at least one sensor associated with the injector, the at least one sensor, in ...more ...less
15
EP2967367B1
Publication/Patent Number: EP2967367B1
Publication date: 2019-02-20
Application number: 13878410.3
Filing date: 2013-03-15
Assignee: Avinger, Inc.
16
EP3441711A1
Publication/Patent Number: EP3441711A1
Publication date: 2019-02-13
Application number: 18187872.9
Filing date: 2018-08-07
Abstract: An interferometer including a master laser, a slave laser and optical elements is provided. The optical elements direct and combine a master laser beam and a slave laser beam into a sensing phase measurement loop to provide a sensing beat signal and a reference phase lock loop to provide a reference beat signal. An electronic circuit portion is coupled to receive the sensing and reference beat signals. The electronic circuit portion includes a clock, at least one numerically controlled oscillator, at least one mixer and an interferometer output. The at least one numerically controlled oscillator has a clock input coupled to the clock. The at least one mixer has a first input to receive the sensing beat signal and a second input to receive an output of the at least one numerically controlled oscillator. The interferometer output is coupled to receive an output of the at least one mixer. An interferometer including a master laser, a slave laser and optical elements is provided. The optical elements direct and combine a master laser beam and a slave laser beam into a sensing phase measurement loop to provide a sensing beat signal and a reference phase lock loop ...more