公开(公告)号：US10168225B2

公开(公告)日：2019-01-01

申请号：US15469413

申请日：2017-03-24

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：US20180364106A1

公开(公告)日：2018-12-20

申请号：US15780182

申请日：2016-11-30

Applicant: THALES

Inventor： Jérome BOURDERIONNET ,  Arnaud BRIGNON ,  Marie ANTIER-MURGEY

IPC: G01J9/02 ,  G01J11/00 ,  G04F13/02 ,  H01S3/00

CPC classification number: G01J9/02 ,  G01J11/00 ,  G04F13/026 ,  H01S3/0057 ,  H01S3/2308

Abstract: A method for measuring the delay between N pulses having a duration less than 100 picoseconds comprises the steps: collimated emission of the pulses having the same repetition frequency, emission of a reference pulse having the same repetition frequency capable of producing interference fringes with each of the pulses, for each of the pulses, detection, by a detector, of the coherent sum of this pulse with the reference pulse, this sum producing the interference fringes, the fringes originating from each of the pulses being distinguishable from one another. The reference pulse is emitted with an adjustable delay, and the method further comprises: for each delay, simultaneous measurement for the pulses of N contrasts of the interference fringes, for each of the pulses, a delay value between this pulse and the reference pulse is determined by the delay corresponding to the maximum contrast.

公开(公告)号：US10151639B2

公开(公告)日：2018-12-11

申请号：US15319204

申请日：2015-06-15

Applicant: COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES

Inventor： Fabien Quere ,  Valentin Gallet ,  Gustave Pariente

IPC: G01J11/00 ,  G01J9/02 ,  G01J3/453

Abstract: A method for characterizing a light beam includes separating the light beam by a separator optic into first and second sub-beams; propagating the first and second sub-beams over first and second optics, respectively, said first and second optics being respectively arranged so that the sub-beams on leaving the optics are separated by a time delay τ; recombining the sub-beams so that they spatially interfere and form a two-dimensional interference pattern; measuring the frequency spectrum of at least part of the interference pattern; calculating the Fourier transform in the time domain of at least one spatial point of the frequency spectrum, the Fourier transform in the time domain having a time central peak and first and second time side peaks; calculating the Fourier transform in the frequency domain for one of the side peaks; calculating the spectral amplitude AR(ω) and the spatial-spectral phase φR(x,y,ω) for the Fourier transform in the frequency domain.

公开(公告)号：US10089594B2

公开(公告)日：2018-10-02

申请号：US14435365

申请日：2013-05-31

Applicant: Ander Olaran Gray

Inventor： Ander Olaran Gray

IPC: G06Q10/08 ,  G06K19/07 ,  H04B10/116 ,  G01J11/00 ,  G06K19/077

Abstract: This invention relates to a system and method for monitoring the cold chain integrity of at least one packet of environmentally sensitive goods. The system comprises a monitoring unit applied directly to the goods packet, the monitoring unit comprising an environmental sensor monitoring an environmental condition to which the goods are subjected to and an optical output device for conveying environmental condition data. The system further comprises a camera operable to capture the environmental condition data conveyed by the optical output device, a memory for storing the environmental condition data captured by the camera and a processor for analyzing the environmental condition data. The use of a camera allows for a very simple, robust and inexpensive optical output device (e.g. an LED) to be used. The arrangement reduces the equipment cost significantly thereby allowing application across a wider range of products and provides greater flexibility and possibility for analyzing the cold chain integrity.

公开(公告)号：US20180248333A1

公开(公告)日：2018-08-30

申请号：US15558965

申请日：2015-11-20

Applicant: KOREA ADVANCED INSTITUE OF SCIENCE AND TECHNOLOGY

Inventor： Jung Won KIM ,  Kwang Yun JUNG

IPC: H01S3/13 ,  G01J11/00 ,  H01S3/067 ,  H01S3/11 ,  H01S3/136 ,  H01S3/08 ,  H01S3/10

CPC classification number: H01S3/10053 ,  G01J11/00 ,  H01S3/00 ,  H01S3/06754 ,  H01S3/08013 ,  H01S3/094 ,  H01S3/1106 ,  H01S3/1305 ,  H01S3/1307 ,  H01S5/06246 ,  H01S5/0657 ,  H01S5/06821 ,  H01S2301/02

Abstract: Provided is a method of measuring a phase noise of a repetition rate of a femtosecond laser including generating a combined signal using a first wavelength element and a second wavelength element of an optical pulse train generated by the femtosecond laser, which is mode-locked, guiding the combined signal to a first path and a second path, allowing a signal of the second path to interfere with the signal of the first path, and outputting an interfering combined signal, dividing the interfering combined signal into a first interference signal and a second interference signal, converting the interference signals to radio frequency signals, and detecting a baseband signal including a frequency noise of the repetition rate from the radio frequency signals using a mixer.

公开(公告)号：US10001412B2

公开(公告)日：2018-06-19

申请号：US15303900

申请日：2015-04-08

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Takashi Inoue ,  Koyo Watanabe ,  Koji Takahashi ,  Naoya Matsumoto

IPC: G01J11/00 ,  G02B5/32 ,  G01J9/00

CPC classification number: G01J11/00 ,  G01J9/00 ,  G02B5/32 ,  G02F2203/56

Abstract: A waveform measurement device includes an input spectrum acquisition unit for acquiring an input intensity spectrum being an intensity spectrum of pulsed light, an optical element inputting the pulsed light and outputting light having an intensity spectrum corresponding to a phase spectrum of the pulsed light, an output spectrum acquisition unit for acquiring an output intensity spectrum being an intensity spectrum of the light output from the optical element, and a phase spectrum determination unit for determining the phase spectrum of the pulsed light by comparing an output intensity spectrum calculated when the pulsed light having an input intensity spectrum and a virtual phase spectrum is assumed to be input to the optical element with the output intensity spectrum acquired in the output spectrum acquisition unit. The phase spectrum determination unit sets the virtual phase spectrum by deforming the control phase spectrum.

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：US09863815B2

公开(公告)日：2018-01-09

申请号：US14968289

申请日：2015-12-14

Applicant: BEIHANG UNIVERSITY

Inventor： Zheng Zheng ,  Xin Zhao ,  Lei Liu ,  Jiansheng Liu

IPC: G01B9/02 ,  G01J11/00 ,  G01J3/42 ,  G01J3/10 ,  G01J3/447 ,  G01J3/02 ,  G01J3/433 ,  G01J1/10 ,  G02F1/365 ,  H01S3/00 ,  G02F1/35 ,  G02F1/37 ,  H01S3/067 ,  H01S3/11 ,  H01S3/23 ,  H01S3/08

CPC classification number: G01J11/00 ,  G01J1/10 ,  G01J3/0224 ,  G01J3/0245 ,  G01J3/10 ,  G01J3/108 ,  G01J3/42 ,  G01J3/433 ,  G01J3/447 ,  G02F1/353 ,  G02F1/365 ,  G02F1/37 ,  G02F2203/13 ,  H01S3/0092 ,  H01S3/06791 ,  H01S3/0809 ,  H01S3/1106 ,  H01S3/1112 ,  H01S3/2391

Abstract: A method and a system for measuring an optical asynchronous sample signal. The system for measuring an optical asynchronous sampling signal comprises a pulsed optical source capable of emitting two optical pulse sequences with different repetition frequencies, a signal optical path, a reference optical path, and a detection device. Since the optical asynchronous sampling signal can be measured by merely using one pulsed optical source, the complexity and cost of the system are reduced. A multi-frequency optical comb system using the pulsed optical source and a method for implementing the multi-frequency optical comb are further disclosed.

公开(公告)号：US09774160B2

公开(公告)日：2017-09-26

申请号：US14837619

申请日：2015-08-27

Applicant: IMRA AMERICA, INC.

Inventor： Donald J. Harter

IPC: H01S3/10 ,  G01J11/00 ,  H01S3/00 ,  H01S3/102 ,  H01S3/108 ,  H01S3/067 ,  H01S3/109 ,  H01S3/13 ,  H01S3/16

CPC classification number: H01S3/10038 ,  G01J11/00 ,  H01S3/0014 ,  H01S3/005 ,  H01S3/0057 ,  H01S3/0064 ,  H01S3/0078 ,  H01S3/06754 ,  H01S3/10023 ,  H01S3/10061 ,  H01S3/102 ,  H01S3/1024 ,  H01S3/108 ,  H01S3/109 ,  H01S3/1305 ,  H01S3/1618

Abstract: A femtosecond laser based laser processing system having a femtosecond laser, frequency conversion optics, beam manipulation optics, target motion control, processing chamber, diagnostic systems and system control modules. The femtosecond laser based laser processing system allows for the utilization of the unique heat control in micromachining, and the system has greater output beam stability, continuously variable repetition rate and unique temporal beam shaping capabilities.

公开(公告)号：US09625323B2

公开(公告)日：2017-04-18

申请号：US14431736

申请日：2013-09-24

Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.

Inventor： Bernd Sartorius ,  Roman Dietz ,  Helmut Roehle

IPC: G01J11/00 ,  H01S3/00 ,  H01S3/23

CPC classification number: G01J11/00 ,  H01S3/0014 ,  H01S3/2383

Abstract: The invention relates to a method for determining the relative temporal position of electromagnetic pulses. Said method having the steps generating a sequence of first electromagnetic pulses, generating a sequence of second electromagnetic pulses, overlaying at least a part of the first and the second pulses in a saturable absorber, detecting the second pulses that have passed through the saturable absorber by means of a detector in such a manner that the second pulses, but not the first pulses that have passed through the saturable absorber, are detected, and determining the temporal position of the first pulses relative to the temporal position of the second pulses with the aid of a signal from the detector which is generated when the second pulses that have passed through the saturable absorber are received.