公开(公告)号：US10680400B2

公开(公告)日：2020-06-09

申请号：US15785022

申请日：2017-10-16

申请人： THE BOEING COMPANY

发明人： Mark Joseph Clemen, Jr. ,  John R. Hull

IPC分类号： H01S3/032 ,  H01S3/07 ,  H01S3/0975 ,  H01S3/102 ,  H01S3/0959 ,  H01S3/10

摘要： A system for generating an energy beam based laser includes an apparatus for receiving an energy beam and for generating an energy beam based laser. The apparatus is configurable or controllable for tuning an output wavelength of the laser generated by the apparatus using the energy beam. The apparatus includes a first component for producing a first magnetic field oriented in a first direction and a second component for producing a second magnetic field oriented in a second direction substantially opposite to the first direction. A channel through the apparatus is defined by the first component and the second component through which the energy beam passes to generate the laser at an output of the apparatus. The apparatus is configurable or controllable for modifying at least one of the first magnetic field and the second magnetic field for tuning the output wavelength of the laser.

公开(公告)号：US10530117B2

公开(公告)日：2020-01-07

申请号：US15393709

申请日：2016-12-29

申请人： FURUKAWA ELECTRIC CO., LTD.

发明人： Koji Kajiwara ,  Takeshi Takagi ,  Kousuke Kashiwagi ,  Kazuaki Hyuga ,  Yoshihiro Emori

IPC分类号： H01S3/13 ,  G02B6/02 ,  G02B6/26 ,  H01S3/067 ,  H01S3/102 ,  H01S3/00 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/16

摘要： An optical fiber laser device generates laser light by using an optical amplifying fiber as an amplification medium in a laser oscillator and includes: an optical outputting fiber configured to emit laser light to an outside; a return-light-attenuating portion configured to perform an attenuation process to return light propagating through at least the optical outputting fiber in a reverse direction of the laser light; a thermal conversion unit provided at the return-light-attenuating portion and configured to convert the return light into heat; a temperature-monitoring device configured to measure an increase in a temperature, of the return-light-attenuating portion, caused by the heat converted by the thermal conversion unit; and a control unit configured to decrease or stop an output of the laser light when the temperature measured by the temperature-monitoring device becomes a predetermined threshold temperature or higher.

公开(公告)号：US20200006910A1

公开(公告)日：2020-01-02

申请号：US16481581

申请日：2018-01-10

申请人： FUJIKURA LTD.

发明人： Masahiro Kashiwagi

IPC分类号： H01S3/067 ,  H01S3/102

摘要： In a case where a variation in reflection resistance among fiber lasers occurs, a reflection resistance of a fiber laser system as a whole is restored by reducing the variation while maintaining an output power of the fiber laser system as a whole. The fiber laser system includes a control section (C) configured to increase a proportion of a backward excitation power (PBi) in a fiber laser (FLi) so that fiber lasers (FL1 through FLn) less vary in reflection resistance.

公开(公告)号：US20190341739A1

公开(公告)日：2019-11-07

申请号：US16401750

申请日：2019-05-02

申请人： WILLIAM LOH ,  Paul William JUODAWLKIS ,  Siva YEGNANARAYANAN

发明人： WILLIAM LOH ,  Paul William JUODAWLKIS ,  Siva YEGNANARAYANAN

IPC分类号： H01S3/30 ,  H01S3/094 ,  H01S3/067 ,  H01S3/13 ,  H01S3/102 ,  H01S3/063

摘要： Ultrastable lasers serve as the backbone for advanced scientific experiments and enable atomic spectroscopy and laser interferometry at high levels of precision. But is not clear how to realize an ultrastable laser that is compact and portable for field use. An ultrastable laser source should be insensitive to both short- and long-term fluctuations in temperature, which ultimately broaden the laser linewidth and cause drift in the laser's center frequency. Fortunately, using a large mode-volume optical resonator, which suppresses the resonator's fast thermal fluctuations, together with the stimulated Brillouin scattering (SBS) optical nonlinearity presents a powerful combination that enables the ability to lase with an ultra-narrow linewidth of 20 Hz. The laser's long-term temperature drift is compensated by using the narrow Brillouin line to sense minute changes in the resonator's temperature (e.g., changes of 85 nK). The precision of this temperature measurement enables the stabilization of resonators against environmental perturbations.

公开(公告)号：US20190280452A1

公开(公告)日：2019-09-12

申请号：US16463019

申请日：2017-11-27

申请人： NEC Corporation

发明人： Yoshihisa INADA

IPC分类号： H01S3/10 ,  H01S3/067 ,  H01S3/0941 ,  H01S3/102 ,  H01S3/23

摘要： An optical amplification device is provided for supplying pump light with different distribution ratio to a plurality of optical fiber amplifiers with high reliability. The optical amplification device includes: a plurality of optical fiber amplifiers (102, 112); and an asymmetric coupling optical system (100) configure to input a plurality of pump light beams (P1, P2) and output a plurality of branched pump light beams (P12_C, P12_D) which are supplied respectively to the plurality of optical fiber amplifiers, the asymmetric coupling optical system including at least one asymmetric coupler (100) of 2-input, 2-output type having a predetermined asymmetric branching ratio, wherein a desired intensity difference between the plurality of branched pump light beams is set by adjusting an intensity of at least one input light beam of the asymmetric coupler.

公开(公告)号：US10374383B2

公开(公告)日：2019-08-06

申请号：US15952762

申请日：2018-04-13

申请人： INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION NATIONAL INSTITUTES OF NATURAL SCIENCES

发明人： Takunori Taira ,  Hwan Hong Lim

IPC分类号： F02P23/04 ,  H01S3/11 ,  H01S3/06 ,  H01S3/10 ,  H01S3/102 ,  H01S3/16 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/113 ,  H01S3/00

摘要： To provide a laser ignition device in which the ignition efficiency is improved and the laser pulse energy necessary for ignition is minimized by optimizing the pulse time width of laser. The laser ignition device includes: a pulse laser oscillator 1 configured to output a beam having a wavelength λ [μm] and a beam quality M2; an energy controller 2 configured to control energy of pulse laser outputted from the pulse laser oscillator 1; a lens 3 having a focal length f [mm] and configured to focus the pulse laser outputted from the pulse laser oscillator 1; and a pulse time width controller 14 configured to control a time width of the pulse laser, wherein the pulse time width controller 14 controls the time width of the pulse laser to be 0.6 to 2 ns.

公开(公告)号：US20190207359A1

公开(公告)日：2019-07-04

申请号：US16292474

申请日：2019-03-05

申请人： JEFFERSON SCIENCE ASSOCIATES, LLC

发明人： Thomas Joseph Powers ,  David R. Douglas ,  Pavel Evtushenko ,  Stephen V. Benson ,  George Neil

IPC分类号： H01S3/09 ,  H01S3/0959 ,  H01S3/102

CPC分类号： H01S3/0903 ,  H01S3/0959 ,  H01S3/102

摘要： A method for varying the wavelength of a free electron laser (FEL) by applying an energy dither to the charged particles supplying the FEL. Bunches of charged particle beams are accelerated by cavities that are operated at a harmonic of the bunch repetition rate. The method involves adding one or more secondary radiofrequency accelerator cavities after the primary beam transport and near the wiggler to apply a fluctuation between individual bunches with a pseudo-random distribution. The secondary radiofrequency accelerator cavities provide fine variations of the beam energy about a nominal operating point. Operating a free electron laser (FEL) with a 1% change in the electron beam energy via the added secondary cavities will result in a 2% wavelength variation of the FEL output.

公开(公告)号：US20190072756A1

公开(公告)日：2019-03-07

申请号：US15911093

申请日：2018-03-03

申请人： LUMENIS LTD.

发明人： Tal Waisman ,  Arkady Khachaturov ,  Moshe Elazar ,  Alla Shnaider ,  Assaf Preiss ,  Izchak Zobel

IPC分类号： G02B26/08 ,  G02B27/09 ,  H01S3/00 ,  H01S3/23 ,  H01S3/06 ,  H01S3/092 ,  H01S3/102 ,  H01S3/02

CPC分类号： G02B26/0816 ,  G02B27/0905 ,  G02B27/0977 ,  H01S3/005 ,  H01S3/0071 ,  H01S3/025 ,  H01S3/061 ,  H01S3/092 ,  H01S3/1024 ,  H01S3/2383

摘要： A multiple cavity laser system includes: a controller configured to operate the system as well as a plurality of laser cavities, each of the laser cavities having an output end wherein, when activated by the controller, an output laser beam is emitted from the output end of each of the laser cavities. The output laser beams when activated are directed, either directly or indirectly, to a rotating mirror. The rotating mirror is operatively connected to the controller and a servo motor. The servo motor, under direction of the controller, redirects the output laser beams along a common optical axis and the output laser beams of the plurality of laser cavities are combined along the common optical axis.

公开(公告)号：US10170883B1

公开(公告)日：2019-01-01

申请号：US15851484

申请日：2017-12-21

申请人： Robert O. Hunter, Jr.

发明人： Robert O. Hunter, Jr.

IPC分类号： H01S3/10 ,  H01S3/00 ,  H01S3/102 ,  H01S3/30 ,  H01S3/22 ,  H01S3/094 ,  H01S3/0943 ,  H01S3/23 ,  H01S3/108 ,  H01S3/225

摘要： The present architecture utilizes a Nonlinear Scattering Aperture Combiner that does not need to be optically multiplexed and then drives a Direct Compressor stage that produces a large temporal compression ratio to pump a Fast Compressor. This eliminates the need for a separate array of ATDMs, multiplexing optical elements, and, at the approximate 107 joule energy output required for ICF, reduces the number of mechanical elements and gas interfaces from the order of 103 to about 10. In addition, this provides a large reduction of the volume of the gas containment region. In order to accomplish this, a technique for transversely segmenting by color and/or polarization of the optical extraction beams of the Direct Compressor has been invented. In particular, it emphasizes the simplicity and uniqueness of design of the Direct Compressor. The Direct Compressor is unique in terms of high fluence, high temporal compression ratios, and high stage gain, leading to a very large reduction in laser costs. It may separately have many other applications than ICF.

公开(公告)号：US10137633B2

公开(公告)日：2018-11-27

申请号：US15526711

申请日：2015-11-05

申请人： CL SCHUTZRECHTSVERWALTUNGS GMBH

发明人： Frank Herzog ,  Florian Bechmann ,  Markus Lippert ,  Johanna Windfelder

IPC分类号： B29C64/153 ,  B33Y50/02 ,  B22F3/105 ,  B33Y10/00 ,  B33Y30/00 ,  B29C64/393 ,  B23K26/06 ,  G02B26/10 ,  H01S3/101 ,  H01S3/102 ,  B29C64/277

摘要： A method for controlling the exposure of a selective laser sintering or laser melting apparatus. The method includes providing a selective laser sintering apparatus or laser melting apparatus that uses successive solidification of layers of a powder-type construction material that can be solidified using radiation. The apparatus comprises an irradiation device for irradiating layers of the construction material that has a plurality of scanners that can separately be actuated, simultaneously irradiating the construction material, the separate detection of irradiation times of each scanner and/or the irradiation areas detected by each scanner, and storing the detected irradiation times and/or irradiation areas; comparing the irradiation times and/or irradiation areas of the scanners with each other; re-determining the surface sections of a powder layer to be irradiated by each scanner so the irradiation times for each scanner are approximated to each other and/or the irradiation areas of each scanner are aligned.