公开(公告)号：US20230358610A1

公开(公告)日：2023-11-09

申请号：US18223209

申请日：2023-07-18

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Takashi KASAHARA ,  Katsumi SHIBAYAMA ,  Kei TABATA ,  Masaki HIROSE ,  Hiroki OYAMA ,  Yumi KURAMOTO

IPC: G01J3/26 ,  G01J3/02 ,  G01J3/45 ,  G02B5/28 ,  G02B26/00

CPC classification number: G01J3/26 ,  G01J3/0297 ,  G01J3/45 ,  G02B5/281 ,  G02B26/001

Abstract: A light detection device of the present invention includes: a wiring board; a first support part disposed on a mounting surface of the wiring board; a Fabry-Perot interference filter having a first mirror part and a second mirror part between which a distance is variable and having an outer edge portion disposed in a first support region of the first support part; a light detector disposed on the mounting surface to face the first mirror part and the second mirror part on one side of the first support part; and a temperature detector disposed on the mounting surface, wherein the temperature detector is disposed on the mounting surface such that at least a part of the temperature detector overlaps a part of the Fabry-Perot interference filter when seen in a first direction perpendicular to the mounting surface and such that at least a part of the temperature detector overlaps a part of the first support part when seen in a second direction in which the first support part and the light detector are aligned with each other, and wherein a first distance between the temperature detector and the first support part in the second direction is smaller than a first width of the first support region in the second direction.

公开(公告)号：US20230288258A1

公开(公告)日：2023-09-14

申请号：US18121446

申请日：2023-03-14

Applicant: Obsidian Sensors, Inc.

Inventor： John HONG ,  Bing WEN ,  Sean ANDREWS ,  Heesun SHIN ,  Edward CHAN ,  Tallis CHANG ,  Ming YING

IPC: G01J3/45 ,  G01J3/02

CPC classification number: G01J3/45 ,  G01J3/0297 ,  G02B6/2935

Abstract: Systems and methods for spectrometry are disclosed. In some embodiments, the system comprises a Fourier Transform Spectrometer (FTS) comprising a waveguide and a delay element. In some embodiments, the method comprises determining a power spectral density of an input optical signal via the FTS.

公开(公告)号：US20230194348A1

公开(公告)日：2023-06-22

申请号：US17915388

申请日：2020-12-16

Applicant: Beijing RSLaser Opto-Electronics Technology Co., Ltd.

Inventor： Guangyi LIU ,  Rui JIANG ,  Xiaoquan HAN ,  Jiangshan ZHAO ,  Pengfei SHA ,  Qingqing YIN ,  Hua ZHANG ,  Xinyue HU

IPC: G01J3/45 ,  G01J3/02

CPC classification number: G01J3/45 ,  G01J3/021 ,  G01J2003/451

Abstract: Provided are a device (4) and a method for online measuring a spectrum for a laser device. The device (4) for online measuring a spectrum for a laser device includes: a first optical path assembly (G1) and a second optical path assembly (G2), and the second optical path assembly (G2) and the first optical path assembly (G1) constitute a measurement optical path. The second optical path assembly (G2) includes: an FP etalon (15) and a grating (18). The homogenized laser beam passes through the FP etalon (15) to generate an interference fringe. The grating (18) is arranged after the FP etalon (15), or is arranged before the FP etalon (15) in the measurement optical path, and is configured to disperse the laser beam passing through the FP etalon (15). A high precision measurement in a wide range for a central wavelength of a laser beam and an accurate measurement for spectral parameters of a corresponding FWHM and E95 are achieved through an arrangement of the FP etalon and the grating “in series” in the measurement optical path. There is no moving element in the measurement optical path, the structure is simple and compact, the measurement precision is high, and the stability is high. The corresponding measurement algorithm is simple and efficient, and has an extremely high scientific research or commercial application value.

公开(公告)号：US11662250B2

公开(公告)日：2023-05-30

申请号：US17112583

申请日：2020-12-04

Applicant: II-VI Delaware, Inc.

Inventor： Michael John Laurence Cahill ,  Yang Li

IPC: G01J3/02 ,  H04B10/25 ,  G01J3/45

CPC classification number: G01J3/0297 ,  G01J3/0218 ,  G01J3/0286 ,  G01J3/45 ,  H04B10/25

Abstract: Described herein is a wavelength reference device comprising a housing defining an internal environment having a known temperature. A broadband optical source is disposed within the housing and configured to emit an optical signal along an optical path. The optical signal has optical power within a wavelength band of interest. An optical etalon is also disposed within the housing and positioned in the optical path to filter the optical signal to define a filtered optical signal that includes one or more reference spectral features having a known wavelength at the known temperature. The device also includes an optical output for outputting the filtered optical signal.

公开(公告)号：US20190204594A1

公开(公告)日：2019-07-04

申请号：US15858368

申请日：2017-12-29

Applicant: Palo Alto Research Center Incorporated

Inventor： Alex Hegyi

IPC: G02B27/00 ,  G02F1/139 ,  G02F1/1335

CPC classification number: G02B27/0081 ,  G01J3/447 ,  G01J3/45 ,  G01J3/4531 ,  G01M11/0271 ,  G02B27/4272 ,  G02F1/133528 ,  G02F1/1395

Abstract: An optical device includes a liquid-crystal variable retarder. An exit-pupil expander is optically coupled to the liquid-crystal variable retarder, the exit-pupil expander includes: at least one optical input feature that receives reference light from a reference light source; and one or more optical coupling elements coupled to receive the reference light from the reference light source and expand the reference light to one or more spatially-separated regions of the liquid-crystal variable retarder

公开(公告)号：US20190011357A1

公开(公告)日：2019-01-10

申请号：US16028531

申请日：2018-07-06

Applicant: SHIMADZU CORPORATION

Inventor： Daijiro Kato ,  Shinya Wakuda

IPC: G01N21/35 ,  G01J3/45

CPC classification number: G01N21/35 ,  G01J3/28 ,  G01J3/45 ,  G01J3/4535 ,  G01J2003/4538 ,  G01N2021/3595

Abstract: The Fourier transform infrared spectrophotometer includes: a light source 11 for generating infrared light having a wavelength width including an absorption wavelength of a compound to be analyzed; an interferometer including a fixed mirror 15 and a movable mirror 16, for generating interfering light from the infrared light; a detector 25 for generating a voltage with a magnitude corresponding to the intensity of the interfering light, and for outputting a voltage obtained by subtracting, from the aforementioned voltage, a voltage with a predetermined magnitude; a high-pass filter 464 for allowing the passage of frequency components equal to or higher than a predetermined frequency in an output voltage from the detector 25; an amplifier 463 for amplifying an output voltage from the high-pass filter 464 by a predetermined multiplying factor; and an analogue-to-digital converter 27 for converting an output voltage from the amplifier 463 into a digital signal.

公开(公告)号：US20190003889A1

公开(公告)日：2019-01-03

申请号：US16106712

申请日：2018-08-21

Applicant: Seiko Epson Corporation

Inventor： Hideaki KASAHARA ,  Masashi KANAI

IPC: G01J3/26 ,  G01J3/45 ,  G01J3/02 ,  G01J3/28

CPC classification number: G01J3/26 ,  G01J3/027 ,  G01J3/2823 ,  G01J3/45 ,  G01J3/51 ,  G01J3/524

Abstract: A spectroscopic camera includes a wavelength variable interference filter, and an image sensor that receives light which is transmitted through the wavelength variable interference filter. Measurement is implemented a plurality of times by causing measurement light to be incident to the wavelength variable interference filter and changing the wavelength of light that is transmitted by the wavelength variable interference filter. Reflectance based on the intensity of light when a first pixel of the image sensor receives light of a target wavelength, is predicted in the respective plurality of repetitions of measurement on the basis of a light reception central wavelength of light that the first pixel receives, and reflectance that is calculated on the basis of the intensity of light that is received by the first pixel.

公开(公告)号：US20180195853A1

公开(公告)日：2018-07-12

申请号：US15741558

申请日：2015-07-10

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Yoshihisa WARASHINA ,  Tomofumi SUZUKI ,  Kohei KASAMORI ,  Ryosuke OKUMURA ,  Kyosuke KOTANI

IPC: G01B9/02

CPC classification number: G01B9/02049 ,  G01B9/02015 ,  G01B9/02027 ,  G01B9/02051 ,  G01J3/0205 ,  G01J3/021 ,  G01J3/0262 ,  G01J3/45 ,  G01J3/453 ,  G01J3/4535

Abstract: An optical interferometer includes a branching-combining unit, a first optical system, a second optical system, and a drive unit, which can be MEMS-based components. The branching-combining unit includes a branching surface, an incident surface, an output surface, and a combining surface on an interface between the interior and the exterior of a transparent member. The branching-combining unit, on the branching surface, partially reflects incident light and outputs as first branched light, and transmits the rest of the incident light into the interior as second branched light. The branching-combining unit, on the combining surface, outputs the first branched light to the outside, reflects the second branched light, and combines the light beams to be output to the outside as combined light.

公开(公告)号：US09964449B2

公开(公告)日：2018-05-08

申请号：US14887114

申请日：2015-10-19

Applicant: Colorado School of Mines

Inventor： Charles G. Durfee ,  Amanda K. Meier

IPC: G01J11/00 ,  G02B27/14 ,  G02B5/122 ,  G01J3/45

CPC classification number: G01J11/00 ,  G01J3/45 ,  G02B5/122 ,  G02B27/149

Abstract: Spectral interferometric systems and methods to characterize lateral and angular spatial chirp to optimize intensity localization in spatio-temporally focused ultrafast beams are described. Interference between two spatially sheared beams in an interferometer leads to straight fringes if the wavefronts are curved. To produce reference fringes, one arm relative to another is delayed in order to measure fringe rotation in the spatially resolved spectral interferogram. Utilizing Fourier analysis, frequency-resolved divergence is obtained. In another arrangement, one beam relative to the other is spatially flipped, which allows the frequency-dependent beamlet direction (angular spatial chirp) to be measured. Blocking one beam shows the spatial variation of the beamlet position with frequency (i.e., the lateral spatial chirp).

公开(公告)号：US20180120086A1

公开(公告)日：2018-05-03

申请号：US15341104

申请日：2016-11-02

Applicant: Matthias Lenzner

Inventor： Matthias Lenzner

IPC: G01B9/02 ,  G01N21/33 ,  G01N21/35 ,  G01N21/31 ,  G01N33/00

CPC classification number: G01N33/0004 ,  G01J3/00 ,  G01J3/1804 ,  G01J3/45 ,  G01J3/4532 ,  G01J3/4537 ,  G01J2003/1208 ,  G01N2033/0093

Abstract: A technique and device to determine the spectrum of electromagnetic radiation in a certain range of wavelengths comprising: splitting said radiation into more than one beam; let these beams counter-propagate in a Sagnac-type ring interferometer; and imprinting a wavelength-dependent angular tilt onto the wavefront of each beam by at least one dispersive element which preferably is a transmission grating or grism; and re-combining the multiple beams on a detector that exhibits spatial resolution and can therefore resolve the fringes formed by interference; and perform the mathematical operations to determine the spectrum of said radiation from the obtained interferogram, wherein the dispersive element is mounted on a stage providing linear and/or rotational movement.