公开(公告)号：US20210096026A1

公开(公告)日：2021-04-01

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 ,  G01J11/00 ,  G02B6/02

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：US10962420B2

公开(公告)日：2021-03-30

申请号：US16213712

申请日：2018-12-07

Applicant: FLIR Systems, Inc.

Inventor： Brian B. Simolon

IPC: H04N5/33 ,  G01J11/00 ,  H04N5/378 ,  H04N5/3745

Abstract: Techniques are disclosed for facilitating pulse detection and imaging. In one example, a device includes a detector configured to detect electromagnetic radiation and generate a detection signal based on the detected electromagnetic radiation. The device further includes an input circuit configured to provide, based on the detection signal, a first signal and a second signal. The device further includes an imaging integration circuit configured to generate an image of at least a portion of a scene based at least in part on the first signal. The device further includes a pulse detection circuit configured to perform pulse detection to generate an indication of whether a pulse is detected in the portion of the scene based at least in part on the second signal. Related methods and systems are also provided.

公开(公告)号：US10746607B2

公开(公告)日：2020-08-18

申请号：US16227716

申请日：2018-12-20

Applicant: SETI Institute

Inventor： Eliot Gillum ,  Alan Holmes

IPC: G01J11/00 ,  H04N5/247 ,  G01J3/28 ,  G01J1/42

Abstract: A system and method for detecting laser pulses is disclosed. According to one embodiment, the present system detects an extrasolar laser pulse, ideally repeated pulses, by observing the pulse, characterizing the pulse, and confirming the data related to the pulse.

公开(公告)号：US20200173860A1

公开(公告)日：2020-06-04

申请号：US16615179

申请日：2018-06-26

Applicant: SPHERE ULTRAFAST PHOTONICS SL ,  UNIVERSIDAD DE SALAMANCA

Inventor： Benjamin ALONSO FERNANDEZ ,  Inigo Juan SOLA LARRANAGA ,  Helder Manuel PAIVA REBELO CEREJO CRESPO

IPC: G01J11/00 ,  G02F1/35

Abstract: The present application relates to a method and system for characterization and compression of ultrashort pulses. It is described a flexible self-calibrating dispersion-scan technique and respective system to characterize and compress ultrashort laser pulses over a broad range of pulse parameters, where previous knowledge of the amount of dispersion introduced for each position or step of the compressor is not required. The self-calibrating d-scan operation is based on the numerical retrieval of the spectral phase of the pulses using an optimization algorithm, where the spectral phase is treated as a multi-parameter unknown variable, and where the unknown dispersion of the dispersion scanning system is described by a theoretical model of its functional dependence on the compressor position.

公开(公告)号：US10594407B2

公开(公告)日：2020-03-17

申请号：US16073106

申请日：2017-01-27

Applicant: Alcatel Lucent

Inventor： Alexandre Shen ,  Jean-Guy Provost

IPC: H04B10/61 ,  H04B10/64 ,  G01J11/00 ,  G02F1/21

Abstract: A system for optical linear sampling and coherent detection of an optical signal OS comprises a source emitting a pulsed optical signal SP and an optical coupler that splits the pulsed optical signal SP into two replicas, the first replica of the pulsed optical signal SP is sent to a first optical hybrid circuit and the second replica of the pulsed optical signal SP is send to a second optical hybrid circuit, a source emitting an optical signal OS and optical coupler that splits the incoming optical signal OS into two replicas, the first replica of the incoming optical signal OS is sent to the first optical hybrid circuit and the second replica of the incoming optical signal OS is sent to a wavelength recovery device WVLR, whose output is a continuous-waveform optical signal CW at the central wavelength of the incoming optical signal OS, which sends it to the second optical hybrid circuit. such that the optical signal OS is sampled within the first hybrid circuit and the continuous waveform optical signal CW is sampled in the second hybrid circuit, and a device BDADC comprising balanced photodectors detecting optical signals at the output of the two optical hybrid circuits and an analog/digital converter ADC.

公开(公告)号：US20200011737A1

公开(公告)日：2020-01-09

申请号：US16404600

申请日：2019-05-06

Applicant: University of South Florida

Inventor： Zhimin Shi ,  Darrick Hay ,  Ziyi Zhu ,  Yiyu Zhou ,  Robert W. Boyd

IPC: G01J4/04 ,  G01J11/00

Abstract: An apparatus measures the transverse profile of vectorial optical field beams, including both the phase and the polarization spatial profile. The apparatus contains a polarization separation module, a weak perturbation module, and a detection module. Characterizing the transverse profile of vector fields provides an optical metrology tool for both fundamental studies of vectorial optical fields and a wide spectrum of applications, including microscopy, surveillance, imaging, communication, material processing, and laser trapping.

公开(公告)号：US20190331486A1

公开(公告)日：2019-10-31

申请号：US16505473

申请日：2019-07-08

Applicant: Trimble AB

Inventor： Johan Carlén ,  Mikael Nordenfelt ,  Christian Grässer

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

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：US10429246B2

公开(公告)日：2019-10-01

申请号：US15792459

申请日：2017-10-24

Applicant: The University of Hong Kong

Inventor： Kenneth Kin Yip Wong ,  Bowen Li

IPC: G01J11/00 ,  G01J9/00 ,  H01S3/067 ,  G02B6/28

Abstract: The panoramic-reconstruction temporal imaging (PARTI) system is a single-shot optical waveform measurement apparatus that achieves scalable record length and sub-picosecond resolution simultaneously for ultrafast non-repetitive waveform characterization, in analogy with the wisdom of stitching multiple mosaic images to achieve larger-field-of-view in the spatial domain. It consists of a high-fidelity optical buffer, a low-aberration time magnifier and synchronization-control electronics. For specific measurement circumstances, the PARTI system can also be carried out based on a passive optical buffer, which reduces the system complexity. The PARTI system is configured for real-time single-shot characterization of non-repetitive optical dynamic waveform that evolves over a time scale much larger than that of its ultrafast temporal details, i.e., optical dynamics with large time-bandwidth product.

公开(公告)号：US20190137393A1

公开(公告)日：2019-05-09

申请号：US16181738

申请日：2018-11-06

Applicant: The University of Chicago

Inventor： Gregory S. Engel ,  Marco Alberto Allodi

IPC: G01N21/63 ,  G01J3/28 ,  G01J3/02 ,  G01J11/00

Abstract: An optical resonance imaging system includes a light emitting device to emit laser pulses onto a subject. The laser pulses include a first pulse and a second pulse to place the subject in an excited state. The laser pulses also include a third pulse to stimulate emission of one or more third order signals from the subject. The system also includes a spectrometer to receive the one or more third order signals and to generate spectrum signals commensurate with intensities of the one or more third order signals. The system may further include circuitry configured to analyze the spectrum signals, generate one or more images of the subject based on the analysis, and construct one or more maps of positions of the subject based on the one or more images.

公开(公告)号：US20190128741A1

公开(公告)日：2019-05-02

申请号：US16088875

申请日：2017-03-15

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Koji TAKAHASHI ,  Haruyasu ITO ,  Koyo WATANABE

IPC: G01J11/00 ,  G01J3/447 ,  G02F1/137 ,  G01J3/02

CPC classification number: G01J11/00 ,  G01J3/0297 ,  G01J3/28 ,  G01J3/447 ,  G02F1/01 ,  G02F1/13 ,  G02F1/137

Abstract: In a waveform measurement method, first, initial pulsed light is spatially dispersed for respective wavelengths. Next, the initial pulsed light is input to a polarization dependent type SLM in a state where a polarization plane is inclined with respect to a modulation axis direction, and a phase spectrum of a first polarization component of the initial pulsed light along the modulation axis direction is modulated, to cause a time difference between first pulsed light Lp1 including the first polarization component and second pulsed light Lp2 including a second polarization component orthogonal to the first polarization component. After combining the wavelength components, an object is irradiated with the pulsed light Lp1 and the pulsed light Lp2, and light generated in the object is detected. The above detection operation is performed while changing the time difference, and a temporal waveform of the pulsed light Lp1 is obtained.