公开(公告)号：US11366012B2

公开(公告)日：2022-06-21

申请号：US16583736

申请日：2019-09-26

Applicant: INSTITUT NATIONAL DE LA RECHERCHE SCIENTIFIQUE (INRS)

Inventor： Jose Azana ,  Konatham Saikrishna Reddy ,  Reza Maram ,  Hugues Guillet De Chatellus

IPC: G01J3/28 ,  G02B6/02 ,  G01J11/00

Abstract: A method and a system for generating a time-frequency representation of an aperiodic continuous input signal comprising generating a periodic train of short pulses having a repetition frequency, and sampling the signal temporally using the periodic train of short pulses to obtain a temporally sampled signal, the temporally sampled signal comprising a plurality of sampled copies of the input signal, each sampled copy being spaced in function of the repetition frequency of the periodic train of short pulses. The temporally sampled signal is delayed based on the repetition frequency to obtain a delayed temporally sampled signal comprising a plurality of delayed sampled copies, a spectral representation of a given delayed sampled copy being delayed in function of the repetition frequency. The delayed temporally sampled signal is evaluated over consecutive time slots to obtain, for each consecutive time slot, a respective output signal in the time-frequency domain.

公开(公告)号：US20220155153A1

公开(公告)日：2022-05-19

申请号：US17428408

申请日：2020-03-06

Applicant: Sony Semiconductor Solutions Corporation

Inventor： Hongbo Zhu ,  Kazuki Hizu ,  Takafumi Takatsuka ,  Yusuke Oike ,  Jun Ogi ,  Yoshiaki Tashiro

IPC: G01J11/00 ,  G01J1/44 ,  H03K23/58

Abstract: A light-receiving apparatus (1a) includes a counting unit (11), a setting unit (12), and an acquiring unit (13). The counting unit is configured to measure a detection number of times that represents the number of times incidence of a photon to a light-receiving element has been detected within an exposure period and to output a counted value. The setting unit is configured to set a cycle of updating time information in accordance with an elapsed time during the exposure period. The acquiring unit is configured to acquire the time information indicating a time at which the counted value reaches a threshold before the exposure period elapses.

公开(公告)号：US11336071B2

公开(公告)日：2022-05-17

申请号：US16161902

申请日：2018-10-16

Applicant: Lumentum Operations LLC

Inventor： Tobyn VanVeghten ,  Joseph J. Alonis ,  James J. Morehead ,  Loren A. Eyres

IPC: H01S3/11 ,  H01S3/094 ,  G01J11/00 ,  H01L27/146 ,  H01L25/16 ,  G01J1/02 ,  G01J1/18 ,  G01J1/42

Abstract: A device may determine at least one metric related to a plurality of laser pulses associated with a Q-switched laser. The device may determine a statistical metric for the at least one metric related to the plurality of laser pulses. The device may determine that the statistical metric satisfies a threshold level of deviation of the at least one metric related to the plurality of laser pulses from a baseline value for the at least one metric. The device may indicate laser degradation of the Q-switched laser based on determining that the statistical metric satisfies the threshold.

公开(公告)号：US11313668B2

公开(公告)日：2022-04-26

申请号：US17223379

申请日：2021-04-06

Applicant: East China Normal University

Inventor： Shi'an Zhang ,  Dalong Qi ,  Chengzhi Jin ,  Yilin He ,  Chengshuai Yang ,  Fengyan Cao ,  Yunhua Yao ,  Yan Yang ,  Zhenrong Sun

IPC: G01B9/02015 ,  G01B9/02 ,  G01B9/0209 ,  G01J11/00

Abstract: The present disclosure provides a compressed ultrafast imaging velocity interferometer system for any reflector, comprising a light source and target system, an etalon interference system, a compressed ultrafast imaging system, a timing control system and a data processing system. An imaging device in the traditional imaging velocity interferometer system for any reflector is replaced by a compressed ultrafast imaging system, a compressed ultrafast Photography (CUP) is introduced in an imaging process, multi-frame images, i.e. three-dimensional images for two-dimensional space and one-dimensional time, are reconstructed via a single measurement by a CUP-VISAR two-dimensional ultrafast dynamic image imaging, a complete dynamic process of a two-dimensional interference fringes image is restored, and spatiotemporal evolution information of a shock wave is effectively acquired, improving an imaging performance of the imaging velocity interferometer system for any reflector in dimension, and achieving a goal that could not be achieved before.

公开(公告)号：US20220011101A1

公开(公告)日：2022-01-13

申请号：US17384053

申请日：2021-07-23

Applicant: Trimble AB

Inventor： Johan Carlén ,  Mikael Nordenfelt ,  Christian Grässer

IPC: G01C1/04 ,  G01C15/00 ,  G01C15/06 ,  G01J11/00 ,  G01S19/51

Abstract: The present disclosure provides a method for determining a direction to a geodetic target from a geodetic instrument. The method includes emitting an optical pulse from the geodetic target, capturing a first image and a second image of the geodetic target using a camera arranged at the geodetic instrument, obtaining a difference image between the first image and the second image, and determining a direction to the geodetic target from the geodetic instrument based on the position of the optical pulse in the difference image. The method further includes synchronizing the geodetic instrument and the geodetic target for emitting the optical pulse concurrently with the capturing of the first image and nonconcurrently with the capturing of the second image. The present disclosure also provides a geodetic instrument, a geodetic target and a geodetic surveying system.

公开(公告)号：US11143558B2

公开(公告)日：2021-10-12

申请号：US16895550

申请日：2020-06-08

Applicant: Chongqing Institute of East China Normal University ,  East China Normal University

Inventor： Heping Zeng ,  Ming Yan ,  Yinqi Wang ,  Xiaoyue Wang

IPC: G01J11/00

Abstract: Provided are a method and a system for measuring a transient time width of an ultrashort pulse in real time. The method includes: performing an interaction of a laser pulse to be measured with a linear chirped pulse in a second-order non-linear medium, to generate a sum-frequency beam, wherein an intensity sag occurs in the chirped pulse after the interaction; performing a time spreading by a time stretching system on the chirped pulse with the intensity sag; detecting the spread chirped pulse with the spread intensity sag by a photoelectric detector, and measuring and recording a time width τ′ of the spread intensity sag by an oscilloscope; and obtaining the transient time width τ of the laser pulse to be measured according to a formula of τ=τ′/M, where M is an amplification coefficient of the time stretching system.

公开(公告)号：US11125863B2

公开(公告)日：2021-09-21

申请号：US15756712

申请日：2016-06-07

Applicant: SONY CORPORATION

Inventor： Toyoharu Oohata ,  Takahiro Koyama ,  Tomoki Ono

IPC: G01S7/497 ,  G01S17/10 ,  G01S7/4861 ,  G01S7/4865 ,  G01C3/06 ,  G01J11/00

Abstract: A correction device including a photon number counting unit that counts a photon number on the basis of an output signal output from a light receiving unit, a correction value acquiring unit that acquires a correction value corresponding to the photon number, and a correction unit that performs correction based on the correction value.

公开(公告)号：US20210072089A1

公开(公告)日：2021-03-11

申请号：US16895550

申请日：2020-06-08

Applicant: Chongqing Institute of East China Normal University ,  East China Normal University

Inventor： Heping ZENG ,  Ming YAN ,  Yinqi WANG ,  Xiaoyue WANG

IPC: G01J11/00

Abstract: Provided are a method and a system for measuring a transient time width of an ultrashort pulse in real time. The method includes: performing an interaction of a laser pulse to be measured with a linear chirped pulse in a second-order non-linear medium, to generate a sum-frequency beam, wherein an intensity sag occurs in the chirped pulse after the interaction; performing a time spreading by a time stretching system on the chirped pulse with the intensity sag; detecting the spread chirped pulse with the spread intensity sag by a photoelectric detector, and measuring and recording a time width τ′ of the spread intensity sag by an oscilloscope; and obtaining the transient time width τ of the laser pulse to be measured according to a formula of τ=τ′/M, where M is an amplification coefficient of the time stretching system.

公开(公告)号：US20200378835A1

公开(公告)日：2020-12-03

申请号：US16576399

申请日：2019-09-19

Applicant: Xi'an Institute of Optics and Precision Mechanics of CAS

Inventor： Qibing SUN ,  Chao ZENG ,  Leiran WANG ,  Wenfu ZHANG ,  Wei ZHAO

IPC: G01J11/00 ,  H04L27/26

Abstract: The present disclosure belongs to the field of optical measurement, and relates to a high-resolution real-time time-frequency domain measuring device and method for an ultra-short pulse. The technical problem of how to realize high-resolution real-time measurement of time-frequency domain information of the ultra-short pulse and improve the accuracy and reliability of a measurement result is solved. The measuring device includes a light splitting unit used to split signal light to be measured, a time lens unit used to perform time domain amplification on the signal light to be measured, a dispersion Fourier transform unit used to perform Fourier transform on the signal light to be measured, and a detection unit used to receive and detect measured data. The present disclosure uses the time lens and the dispersion Fourier transform technology to realize the real-time measurement of sub-picosecond transient characteristics of the ultra-short pulse to accurately obtain the time-frequency domain information of the ultra-short pulse, thereby breaking through the capacity limitation to the bandwidth of a traditional oscilloscope, the measuring speed of a spectrometer and the like, and the present disclosure is suitable for femtosecond-grade ultra-short pulses.

公开(公告)号：US10651619B2

公开(公告)日：2020-05-12

申请号：US15549266

申请日：2016-02-05

Applicant: UNIVERSITAT POLITECNICA DE CATALUNYA ,  UNIVERSIDAD DE SALAMANCA ,  SPHERE ULTRAFAST PHOTONICS, SA

Inventor： Jose Francisco Trull-Silvestre ,  Crina Maria Cojocaru ,  Inigo Juan Sola-Larranaga ,  Rosa Maria Romero-Muniz ,  Francisco Jose Maia Da Silva ,  Helder Manuel Paiva Rebelo Cerejo Crespo

IPC: H01S3/00 ,  G02F1/37 ,  G01J3/28 ,  H01S3/067 ,  G01J11/00 ,  G02F1/35

Abstract: The optical system comprises: means for introducing a controlled negative or positive chirp to an incoming ultrashort laser pulse to be characterized; a nonlinear optical medium through which said chirped ultrashort laser pulse is propagated, wherein as a result of said propagation: different chirp values are introduced in the ultrashort laser pulse at different propagation distances along the nonlinear optical medium, and a transverse nonlinear signal is generated in a direction perpendicular to the propagation axis; analyzing means configured for recording a single-shot spectral image of said generated transverse nonlinear signal; and a processing module comprising one or more processors configured to execute a numerical iterative algorithm to said single-shot spectral image to retrieve the electric field, amplitude and phase, of the ultrashort laser pulse.