公开(公告)号：US20200028316A1

公开(公告)日：2020-01-23

申请号：US16487792

申请日：2018-02-27

申请人： CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE ,  INSTITUT NATIONAL DES SCIENCES APPLIQUEES - ROUEN ,  UNIVERSITE DE ROUEN NORMANDIE

发明人： Ammar HIDEUR ,  Adil HABOUCHA ,  Arnaud BULTEL ,  Said IDLAHCEN ,  Thomas GODIN

IPC分类号： H01S3/10 ,  H01S3/00 ,  H01S3/23

摘要： A laser source for emitting a group of pulses, includes a primary laser source suitable for emitting at least one primary laser pulse; at least one interferometer suitable for forming, from the primary laser pulse, a plurality of secondary laser pulses, each interferometer comprising at least one delay line allowing two secondary laser pulses to be temporally separated, by a delay comprised between 50 ps and 10 ns; and a single-mode amplifying optical fiber intended to receive the secondary laser pulses, in order to form as output a group of spatially superposed pulses.

公开(公告)号：US20220254601A1

公开(公告)日：2022-08-11

申请号：US17623584

申请日：2020-07-23

申请人： CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE ,  INSTITUT NATIONAL DES SCIENCES APPLIQUEES DE ROUEN ,  UNIVERSITE DE ROUEN NORMANDIE

发明人： Angela VELLA ,  Jonathan HOUARD ,  Ammar HIDEUR ,  Laurent ARNOLDI ,  Lorenzo RIGUTTI

IPC分类号： H01J37/285 ,  H01J37/20 ,  H01J37/26

摘要： A tomographic atom probe includes an analysis chamber intended to analyze a sample of material in the form of a nanotip mounted on an anti-vibration support, the nanotip being brought to a temperature of between 0 kelvin and ambient temperature, the nanotip being biased at an adjustable voltage of between 1 kV and 15 kV, the analysis chamber comprising a position-sensitive and time of flight-sensitive ion detector. The atom probe comprises a generator for generating high-peak-intensity single-cycle ultrashort terahertz pulses, the analysis chamber comprising optical means for focusing the terahertz pulses, the focusing of the terahertz pulses causing the atoms of the nanotip to evaporate through the field effect without thermal effects. The terahertz pulses are generated by a femtosecond pulsed laser emitting very high-power ultrashort optical pulses at a high rate.

公开(公告)号：US20190173256A1

公开(公告)日：2019-06-06

申请号：US16320993

申请日：2017-07-25

申请人： CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE -CNRS- ,  UNIVERSITE DE LIMOGES

发明人： Sébastien FEVRIER ,  Leonid KOTOV ,  Ammar HIDEUR

IPC分类号： H01S3/067 ,  A61B5/00 ,  G01N21/64 ,  H01S3/16 ,  H01S3/30

摘要： A femtosecond laser source includes an injection laser oscillator with an optical fiber doped with a given material, suitable for delivering, via an output optical fiber, a first picosecond pulse, at a first wavelength λ1; a power amplifier with an amplifying optical fiber for producing, from the first pulse, a second pulse at the first wavelength, with an energy that is amplified relative to the first pulse, the amplifying optical fiber being doped with the same material as the optical fiber of the injection oscillator and having a length less than or equal to the distance from the point of soliton compression and greater than the distance from which the amplifying optical fiber operates in non-linear mode; a fiber with a frequency shift suitable for receiving the second pulse and generating, by Raman self-shifting, a fundamental soliton at a second wavelength λ2 that is strictly greater than the first wavelength λ1.