公开(公告)号：US20230321750A1

公开(公告)日：2023-10-12

申请号：US18020624

申请日：2020-08-27

Applicant: Mitsubishi Electric Corporation

Inventor： Kyohei ISHIKAWA ,  Masaki SEGUCHI ,  Motoaki NISHIWAKI ,  Kenta FUJII ,  Tomotaka KATSURA

IPC: B23K26/03 ,  B23K26/042 ,  B23K26/06 ,  B23K26/38 ,  B23K26/70

CPC classification number: B23K26/032 ,  B23K26/042 ,  B23K26/0643 ,  B23K26/0648 ,  B23K26/38 ,  B23K26/705 ,  B23K31/006

Abstract: A laser machining apparatus includes an actuator that changes relative positions of a machining head and a workpiece; a control unit that controls in machining execution the laser oscillator, the machining head, and the actuator based on a machining parameter; a machining state observation unit that detects, from process light that is light generated from the workpiece by laser beam irradiation, light intensities in a plurality of predetermined wavelength bands as a plurality of optical sensor signals; a feature extraction unit that extracts at least one of features, the features being obtainable from an index of correlation between the plurality of optical sensor signals and from one of the optical sensor signals; and a correction quantity calculation unit that determines the machining parameter to be corrected as a correction parameter and a correction quantity for the correction parameter based on the at least one of the features.

公开(公告)号：US20170207605A1

公开(公告)日：2017-07-20

申请号：US15315436

申请日：2015-07-24

Applicant: MITSUBISHI ELECTRIC CORPORATION

Inventor： Daiji MORITA ,  Masato KAWASAKI ,  Susumu KONNO ,  Tomotaka KATSURA ,  Shuichi FUJIKAWA

IPC: H01S5/40 ,  H01S5/022 ,  H01S5/14

CPC classification number: H01S5/4012 ,  H01S5/02288 ,  H01S5/141 ,  H01S5/143 ,  H01S5/4062 ,  H01S5/4087

Abstract: A semiconductor laser device, in which, between a wavelength dispersive element and a partially reflecting mirror, such an anamorphic prism pair is arranged that is configured to increase an angle formed by a regular oscillation optical axis of a regular oscillation beam emitted from each of light emitting points and a cross-coupling optical axis of a cross-coupling oscillation beam oscillating through a different one of the light emitting points. It is therefore possible to increase oscillation loss of the cross-coupling oscillation beam, thereby improving focusing properties, without increasing the device in size.

公开(公告)号：US20200028332A1

公开(公告)日：2020-01-23

申请号：US16481540

申请日：2018-01-12

Applicant: Mitsubishi Electric Corporation

Inventor： Nobutaka KOBAYASHI ,  Tomotaka KATSURA ,  Daiji MORITA ,  Junichi NISHIMAE ,  Tomohiro KYOTO

IPC: H01S5/40 ,  H01S5/14 ,  H01S3/08

Abstract: A wavelength combining laser apparatus includes: a semiconductor laser emitting laser beams in an optical-axial direction perpendicular to a laser beam combining direction; a wavelength combining element combining the laser beams in the laser beam combining direction into a single laser beam; a cross-coupling reduction optical system having positive power in the laser beam combining direction perpendicular to an optical axis of the single laser beam output from the wavelength combining element; and a partially-reflective mirror reflecting the single laser beam having passed through the cross-coupling reduction optical system and also allowing the single laser beam to transmit through and exit the partially-reflective mirror. The cross-coupling reduction optical system is disposed to image the light emitting end face on the partially-reflective mirror by causing the light emitting end face to be conjugate to the partially-reflective mirror in a plane formed by the optical axis and the laser beam combining direction.

公开(公告)号：US20190267777A1

公开(公告)日：2019-08-29

申请号：US16341452

申请日：2017-03-17

Applicant: Mitsubishi Electric Corporation

Inventor： Tomohiro KYOTO ,  Tomotaka KATSURA ,  Daiji MORITA

IPC: H01S5/40 ,  H01S5/14 ,  G02B27/28

Abstract: A laser oscillation apparatus includes a wave plate and a diffraction grating disposed between a laser beam source and a partial reflection mirror. The wave plate changes polarization directions of laser beams emitted from semiconductor lasers to a second direction perpendicular to a first direction. The diffraction grating is disposed at a position where laser beams polarized in the first direction are superposed into one beam and laser beams whose polarization directions are changed to the second direction are superposed into one beam, superposes laser beams polarized in the first direction to have one optical axis, superposes laser beams polarized in the second direction to have one optical axis, and outputs superposed laser beams toward the partial reflection mirror. The laser oscillation apparatus includes a birefringent element to combine laser beams having mutually different optical axes output from the partial reflection mirror into one laser beams having one optical axis.

公开(公告)号：US20230163550A1

公开(公告)日：2023-05-25

申请号：US17922787

申请日：2021-03-23

Applicant: Mitsubishi Electric Corporation

Inventor： Masato KAWASAKI ,  Hiroshi KIKUCHI ,  Tomotaka KATSURA

IPC: H01S3/02 ,  H01S5/14 ,  H01S3/08

CPC classification number: H01S3/025 ,  H01S5/142 ,  H01S3/08009

Abstract: A laser system includes: a first laser element constituting one end of a first external resonator; a second laser element constituting one end of a second external resonator; a diffractive optical element to which a first beam group and a second beam group enter; a partially reflective element that constitutes an opposite end of the first external resonator and an opposite end of the second external resonator, reflects a part of the first beam and a part of the second beam, and transmits the remainder of the first beam and the remainder of the second beam; and a beam deflection element that deflects the second beam emitted from the diffractive optical element toward the partially reflective element.

公开(公告)号：US20230125357A1

公开(公告)日：2023-04-27

申请号：US17914764

申请日：2020-05-11

Applicant: Mitsubishi Electric Corporation

Inventor： Masato KAWASAKI ,  Tomotaka KATSURA

IPC: B23K26/064 ,  B23K26/06 ,  B23K26/38

Abstract: A laser machining apparatus includes an output ratio control unit that changes an output ratio between a first laser beam and a second laser beam having different propagation characteristics; a superimposing optical system that multiplexes the first laser beam and the second laser beam; an optical fiber in which beam propagation characteristics of a combined laser beam at an exit varies depending on the output ratio, the combined laser beam being a laser beam obtained by combination of the first laser beam and the second laser beam; and a condensing optical system that performs machining of a workpiece by concentrating, on the workpiece, the beam emitted from the optical fiber.

公开(公告)号：US20210057887A1

公开(公告)日：2021-02-25

申请号：US17043689

申请日：2018-04-02

Applicant: Mitsubishi Electric Corporation

Inventor： Tomohiro KYOTO ,  Tomotaka KATSURA ,  Daisuke MORITA ,  Hiroyuki TAKEUCHI ,  Yumi GENDA

IPC: H01S5/40 ,  H01S5/026 ,  H01S5/00

Abstract: A laser device includes a plurality of laser diodes that generate laser light beams having different wavelengths from each other, a partial reflective mirror constituting a resonator along with the laser diodes, a wavelength dispersive element set in the resonator, which combines parts of the laser light beams outputted by the laser diodes to each other, emits the combined parts of the laser light beams as a first laser light beam toward the partial reflective mirror, and emits other parts of the laser light beams as second laser light beams in directions different from the direction toward the partial reflective mirror, and an output detecting unit detecting intensities of the second laser light beams.

公开(公告)号：US20220123523A1

公开(公告)日：2022-04-21

申请号：US17429366

申请日：2019-03-29

Applicant: Mitsubishi Electric Corporation

Inventor： Masato KAWASAKI ,  Tomotaka KATSURA ,  Shuichi FUJIKAWA

IPC: H01S5/14 ,  H01S5/40

Abstract: A semiconductor laser device includes semiconductor laser elements emitting laser beams having different wavelengths from each other and a partial reflection element. The semiconductor laser elements and the partial reflection element constitute respective ends of an external resonator. Further, there is a transmissive wavelength dispersion element located on optical paths of the laser beams between the semiconductor laser elements and the partial reflection element and at a position where the laser beams are superimposed. The transmissive wavelength dispersion element has a wavelength dispersion property, and changes traveling directions of the laser beams in a first plane including the optical axes of the laser beams to combine the laser beams to have one optical axis. Also, there is an asymmetric refraction optical element located on an optical path between the transmissive wavelength dispersion element and the partial reflection element.

公开(公告)号：US20190252844A1

公开(公告)日：2019-08-15

申请号：US16336473

申请日：2017-02-13

Applicant: Mitsubishi Electric Corporation

Inventor： Junichi NISHIMAE ,  Tomotaka KATSURA ,  Daiji MORITA ,  Hiroaki KUROKAWA

IPC: H01S3/08

CPC classification number: H01S3/08009 ,  H01S3/08004 ,  H01S3/08086 ,  H01S3/082

Abstract: A laser oscillator includes: an external resonator configured to include laser media to emit laser beams having different wavelengths; and a partially reflective mirror to transmit part of the laser beams and reflect and return a remainder toward the laser media. The external resonator includes therein: a diffraction grating to perform wavelength coupling on the laser beams having different wavelengths emitted from the laser media so as to superimpose the laser beams into one laser beam and to emit, to the partially reflective mirror, the one laser beam; and a prism that is placed between the laser media and the diffraction grating and that superimposes the laser beams into one laser beam on the diffraction grating, the prism including two surfaces forming an apex angle, one of the two surfaces being an incident surface and another of the two surfaces being an exit surface.

公开(公告)号：US20160329685A1

公开(公告)日：2016-11-10

申请号：US15109353

申请日：2014-12-04

Applicant: MITSUBISHI ELECTRIC CORPORATION

Inventor： Tomotaka KATSURA ,  Daiji MORITA ,  Susumu KONNO ,  Shuichi FUJIKAWA

IPC: H01S5/40 ,  G01J1/42 ,  H01S5/14

CPC classification number: H01S5/4012 ,  G01J1/4257 ,  G02B6/42 ,  G02B6/4214 ,  G02B6/4215 ,  H01S5/14 ,  H01S5/4062 ,  H01S5/4087

Abstract: A semiconductor laser device including an external resonator including: emitters of a semiconductor laser which output a plurality of beams having different wavelengths; a combining optical system which spatially overlaps the plurality of beams output from the semiconductor laser; a wavelength dispersive element which overlaps the overlapped plurality of beams into a single beam by wavelength dispersion; and a partial reflecting mirror which reflects a portion of the single beam and returns same to the wavelength dispersive element, wherein when the width of the wavelength dispersive element in a direction in which the single beam is separated into a plurality of beams by wavelength dispersion is taken as a wavelength dispersive element width, and when the beam upon establishment of normal oscillation is taken as a normal oscillation beam, the wavelength dispersive element width is the same size as the width of the normal oscillation beam.

Abstract translation: 一种包括外部谐振器的半导体激光器件，包括：输出具有不同波长的多个光束的半导体激光器的发射器; 与半导体激光器输出的多个光束空间重叠的组合光学系统; 波长色散元件，其通过波长色散与重叠的多个光束重叠成单个光束; 以及反射单个光束的一部分并将其返回到波长色散元件的部分反射镜，其中当通过波长色散将单个光束分离成多个光束的方向上的波长色散元件的宽度为 作为波长色散元件宽度，并且当建立正常振荡时的光束被认为是正常振荡光束时，波长色散元件宽度与正常振荡光束的宽度相同。