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    Fiber laser apparatus
    1.
    发明授权
    Fiber laser apparatus 有权

    公开(公告)号：US11171462B2

    公开(公告)日：2021-11-09

    申请号：US16194071

    申请日：2018-11-16

    Applicant: Furukawa Electric Co., Ltd.

    Inventor： Kosuke Kashiwagi ,  Akira Fujisaki ,  Yoshihiro Emori

    IPC: H01S3/067 ,  B23K26/042 ,  H01S3/23 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/10

    Abstract: A fiber laser apparatus that generates invisible laser light using an amplification optical fiber having a core and that propagates a fundamental mode and a low-order mode is provided. The fiber laser apparatus includes a visible laser light source that generates visible laser light, an introducing section that introduces the visible laser light generated by the visible laser light source into a core of the amplification optical fiber, a cladding light attenuating section that attenuates light which has propagated through a cladding of the amplification optical fiber, at a subsequent stage of the amplification optical fiber, and a drive unit that drives the visible laser light source to emit the visible laser light through a core of the output optical fiber in a case of performing alignment of an irradiation position of the invisible laser light with respect to a workpiece.

    Optical fiber laser device
    2.
    发明授权
    Optical fiber laser device 有权

    公开(公告)号：US10862262B2

    公开(公告)日：2020-12-08

    申请号：US16684040

    申请日：2019-11-14

    Applicant: FURUKAWA ELECTRIC CO., LTD.

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

    IPC: H01S3/13 ,  H01S3/102 ,  G02B6/26 ,  H01S3/00 ,  G02B6/255 ,  G02B6/02 ,  H01S3/067 ,  H01S3/0941 ,  H01S3/094 ,  H01S3/16

    Abstract: 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.

    Optical fiber laser device
    3.
    发明授权
    Optical fiber laser device 有权

    公开(公告)号：US10530117B2

    公开(公告)日：2020-01-07

    申请号：US15393709

    申请日：2016-12-29

    Applicant: FURUKAWA ELECTRIC CO., LTD.

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

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

    Abstract: 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.

    Optical fiber laser equipment
    4.
    发明授权
    Optical fiber laser equipment 有权
    光纤激光设备

    公开(公告)号：US09190802B2

    公开(公告)日：2015-11-17

    申请号：US14598691

    申请日：2015-01-16

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Taizo Miyato ,  Kosuke Kashiwagi ,  Yoshihiro Emori ,  Akira Fujisaki ,  Koji Kajiwara

    IPC: H01S3/30 ,  H01S3/102 ,  H01S3/067 ,  H01S3/0941 ,  H01S3/094 ,  H01S3/16 ,  H01S3/13

    CPC classification number: H01S3/1022 ,  H01S3/067 ,  H01S3/06716 ,  H01S3/06733 ,  H01S3/0675 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/094053 ,  H01S3/0941 ,  H01S3/09415 ,  H01S3/1305 ,  H01S3/1312 ,  H01S3/1608 ,  H01S3/1618 ,  H01S3/2391

    Abstract: An optical fiber laser device includes optical reflectors making an invisible laser light from an amplification optical fiber; a light source outputting a visible light; an introduction unit outputting the laser light input to a first input terminal from a first output terminal mainly, outputting the visible light input to a second input terminal from the first output terminal mainly, inputting the visible light output by the light source connected to the second input terminal and introducing the visible light to the amplification optical fiber or a output optical fiber via the first output terminal; an optical multiplexer/demultiplexer outputting the visible light to the introduction unit, and outputting a leaking return light input from a side of the introduction unit; and a controller outputting the visible light from the output optical fiber in a case of determining a position at which the laser light will be irradiated.

    Abstract translation: 光纤激光器件包括从放大光纤制造不可见激光的光反射器; 输出可见光的光源; 导入部主要从第一输出端子输出输入到第一输入端子的激光，主要从第一输出端子输出输入到第二输入端子的可见光，输入由连接到第二输出端子的光源输出的可见光 输入端子，并通过第一输出端子将可见光引入放大光纤或输出光纤; 将所述可见光输出到所述引入单元，并输出从所述导入单元的一侧输入的泄漏返回光的光复用器/解复用器; 以及在确定激光将被照射的位置的情况下从输出光纤输出可见光的控制器。

    Raman amplifier, optical repeater, and Raman amplification method
    7.
    发明授权
    Raman amplifier, optical repeater, and Raman amplification method 有权
    拉曼放大器，光中继器和拉曼放大法

    公开(公告)号：US09281654B2

    公开(公告)日：2016-03-08

    申请号：US13859133

    申请日：2013-04-09

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Youichi Akasaka ,  Yoshihiro Emori ,  Shu Namiki

    IPC: H01S3/30 ,  H01S3/067 ,  H04B10/291 ,  H01S3/091 ,  H01S3/094 ,  H01S3/10 ,  H01S3/23

    CPC classification number: H01S3/302 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/0912 ,  H01S3/094011 ,  H01S3/094015 ,  H01S3/094096 ,  H01S3/10007 ,  H01S3/10015 ,  H01S3/2375 ,  H01S3/2383 ,  H01S2301/04 ,  H04B10/2916

    Abstract: A Raman amplifier using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, to output pumping lights having different central wavelengths, an interval between adjacent central wavelengths greater than 6 nm and smaller than 35 nm. An optical repeater is adapted to compensate loss in an optical fiber transmission line by the Raman amplifier. A Raman amplification method wherein the shorter the central wavelength of the pumping light, the higher light power of the pumping light. In the Raman amplifier, a certain pumping 1 wavelength being a first channel, and second to n-th channels are arranged with an interval of about 1 THz toward a longer wavelength side, pumping lights having wavelengths corresponding to the first to n-th channels are multiplexed, and pumping light having a wavelength spaced apart from the n-th channel by 2 THz or more toward the longer wavelength side is combined with the multiplexed light, thereby forming the pumping light source.

    Abstract translation: 使用Fabry-Perot，DFB或DBR型或MOPA的半导体激光器的拉曼放大器输出具有不同中心波长的泵浦光，相邻中心波长之间的间隔大于6nm且小于35nm。 光中继器适于补偿拉曼放大器在光纤传输线路中的损耗。 拉曼放大法，其中泵浦光的中心波长越短，泵浦光的光功率越高。 在拉曼放大器中，一定的泵浦波长为第一通道，第二至第n通道以较长波长侧的大约1THz的间隔排列，具有对应于第一至第n通道的波长的泵浦光 并且将与第n通道间隔开的波长朝向较长波长侧的2Hz以上的泵浦光与复用光结合，从而形成泵浦光源。

    OPTICAL FlBER LASER EQUIPMENT
    8.
    发明申请
    OPTICAL FlBER LASER EQUIPMENT 有权
    光纤激光设备

    公开(公告)号：US20150214692A1

    公开(公告)日：2015-07-30

    申请号：US14598691

    申请日：2015-01-16

    Applicant: FURUKAWA ELECTRIC CO., LTD.

    Inventor： Taizo MIYATO ,  Kosuke Kashiwagi ,  Yoshihiro Emori ,  Akira Fujisaki ,  Koji Kajiwara

    IPC: H01S3/102 ,  H01S3/16 ,  H01S3/094 ,  H01S3/067 ,  H01S3/0941

    CPC classification number: H01S3/1022 ,  H01S3/067 ,  H01S3/06716 ,  H01S3/06733 ,  H01S3/0675 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/094053 ,  H01S3/0941 ,  H01S3/09415 ,  H01S3/1305 ,  H01S3/1312 ,  H01S3/1608 ,  H01S3/1618 ,  H01S3/2391

    Abstract: An optical fiber laser device includes optical reflectors making an invisible laser light from an amplification optical fiber; a light source outputting a visible light; an introduction unit outputting the laser light input to a first input terminal from a first output terminal mainly, outputting the visible light input to a second input terminal from the first output terminal mainly, inputting the visible light output by the light source connected to the second input terminal and introducing the visible light to the amplification optical fiber or a output optical fiber via the first output terminal; an optical multiplexer/demultiplexer outputting the visible light to the introduction unit, and outputting a leaking return light input from a side of the introduction unit; and a controller outputting the visible light from the output optical fiber in a case of determining a position at which the laser light will be irradiated.

    Abstract translation: 光纤激光器件包括从放大光纤制造不可见激光的光反射器; 输出可见光的光源; 导入部主要从第一输出端子输出输入到第一输入端子的激光，主要从第一输出端子输出输入到第二输入端子的可见光，输入由连接到第二输出端子的光源输出的可见光 输入端子，并通过第一输出端子将可见光引入放大光纤或输出光纤; 将所述可见光输出到所述引入单元，并输出从所述导入单元的一侧输入的泄漏返回光的光复用器/解复用器; 以及在确定激光将被照射的位置的情况下从输出光纤输出可见光的控制器。

    OPTICAL SIGNAL AMPLIFIER
    9.
    发明申请
    OPTICAL SIGNAL AMPLIFIER 有权
    光信号放大器

    公开(公告)号：US20020176153A1

    公开(公告)日：2002-11-28

    申请号：US09654974

    申请日：2000-09-05

    Applicant: The Furukawa Electric Co., Ltd.

    Inventor： Shunichi Matsushita ,  Shu Namiki ,  Yoshihiro Emori

    IPC: H01S003/00

    CPC classification number: H01S3/302 ,  H01S3/094003 ,  H01S3/094073 ,  H01S3/094096 ,  H01S3/2375 ,  H01S5/146

    Abstract: Abstract of DisclosureAn optical signal amplifier comprises a light source, a depolarizer, and a gain medium that transfers energy from a pump beam output from the depolarizer to the optical signal. The depolarizer may comprise one or more birefringent optical fibers which support two polarization modes, a fast mode and a slow mode. The light propagates in the fast mode at a higher velocity than the light propagates in the slow mode so as to impart phase delay as the light propagates in the birefringent optical fibers, thereby at least partially depolarizing the beam.

    Abstract translation: 一种光信号放大器包括光源，去极化器和将从去偏振器输出的泵浦光束的能量传递到光信号的增益介质。 去偏振器可以包括支持两种偏振模式的一个或多个双折射光纤，即快速模式和慢速模式。 光在快速模式下以比在慢速模式中传播的光速更高的速度传播，以便当光在双折射光纤中传播时给予相位延迟，从而至少部分地使光束去极化。

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