公开(公告)号：US20240004043A1

公开(公告)日：2024-01-04

申请号：US18267762

申请日：2021-12-10

Applicant: THALES

Inventor： Patrick FENEYROU ,  Jérôme BOURDERIONNET ,  Daniel DOLFI

IPC: G01S7/4912 ,  G01S17/34 ,  G01S17/58 ,  G01S7/481

CPC classification number: G01S7/4917 ,  G01S17/34 ,  G01S17/58 ,  G01S7/4811

Abstract: A method for processing a signal from a coherent lidar comprising a periodically frequency-modulated coherent source (L), the method includes the following steps: A decomposing each modulation period indexed j into a plurality of intervals indexed i, and determining, for each interval Iij, an elementary power spectral density DSP(i,j) of the beat signal over the interval, B determining an average power spectral density over j DSP(i), C determining a lower frequency bound of the average power density DSP(i) and an upper frequency bound, D determining a distance dk(i) and a velocity of the fluid vk(i) from the lower and upper bounds.

公开(公告)号：US20170199390A1

公开(公告)日：2017-07-13

申请号：US15313028

申请日：2015-05-26

Applicant: THALES

Inventor： Jérôme BOURDERIONNET ,  Arnaud BRIGNON

IPC: G02B27/10 ,  H01S3/00 ,  H01S3/08 ,  H01S3/23

CPC classification number: G02B27/1086 ,  H01S3/005 ,  H01S3/08009 ,  H01S3/0826 ,  H01S3/10 ,  H01S3/2383

Abstract: A system based on recombination by superposition using a diffractive optical element DOE to combine the beams is provided. An optical diffractive assembly is placed upstream of a diffractive optical element to make it possible, via an appropriate imaging system, to optimize the combining efficiency in the ultra-short pulse regime.

公开(公告)号：US20180356441A1

公开(公告)日：2018-12-13

申请号：US15778607

申请日：2016-11-07

Applicant: THALES

Inventor： Matthieu DUPONT-NIVET ,  Sylvain SCHWARTZ ,  Arnaud BRIGNON ,  Jérôme BOURDERIONNET

IPC: G01P15/093 ,  G01C19/58 ,  H01S5/0687 ,  H01S5/40 ,  H01S5/50 ,  H01S5/026 ,  H01S5/068 ,  H01S5/02 ,  H01S5/12

CPC classification number: G01P15/093 ,  G01C19/58 ,  G01P15/08 ,  H01S3/0085 ,  H01S3/10084 ,  H01S3/1303 ,  H01S3/1307 ,  H01S5/021 ,  H01S5/026 ,  H01S5/06821 ,  H01S5/0687 ,  H01S5/12 ,  H01S5/4025 ,  H01S5/50

Abstract: A laser-source assembly that is configured to illuminate a vacuum chamber containing atoms in the gaseous state so as to implement a cold-atom inertial sensor, the atoms having at least two fundamental levels that are separated by a fundamental frequency difference comprised between 1 and a few gigahertz, the assembly comprises: a master laser that emits a beam having a master frequency; a first control loop that is configured to stabilize the master frequency of the master laser on a frequency corresponding to half a set frequency of an atomic transition between a fundamental level and an excited level of the atoms; a slave laser that has a slave frequency; and a second control loop that is configured to stabilize the slave frequency of the slave laser with respect to the master frequency, the slave frequency being offset with respect to the master frequency successively, over time, by a first preset offset value, a second preset offset value, and a third preset offset value, the offset values being comprised in an interval equal to half the fundamental frequency difference plus or minus a few hundred MHz.

公开(公告)号：US20170201063A1

公开(公告)日：2017-07-13

申请号：US15313542

申请日：2015-05-26

Applicant: THALES

Inventor： Jérôme BOURDERIONNET ,  Arnaud BRIGNON

IPC: H01S3/23 ,  H01S3/10 ,  H01S3/13

CPC classification number: H01S3/1307 ,  G02B6/00 ,  H01S3/08009 ,  H01S3/10053 ,  H01S3/1024 ,  H01S3/1305 ,  H01S3/2308 ,  H01S3/2383

Abstract: A system for phasing periodically configured laser sources, which comprises: means for collimating and directing the beams arising from the sources onto a combining diffractive optical element with a periodic phase grating, with an angle of incidence that differs from one beam to the next, these angles of incidence being determined according to the period of the grating; means for controlling the phases of the sources based on a negative feedback signal arising from the combined beams; means for drawing off a fraction of the combined beams; on the path of this fraction of the beams, a Fourier lens, with the combining diffractive optical element in its object plane; a matrix of detectors in the image plane of the Fourier lens, capable of detecting intensity distributions; means for calculating the negative feedback signal based on these intensity distributions.