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公开(公告)号：US20150229095A1
公开(公告)日：2015-08-13
申请号：US14688709
申请日：2015-04-16
Applicant: Furukawa Electric Co., Ltd. , Komatsu Ltd.
Inventor： Taizo MIYATO , Kanji TANAKA , Koji KAJIWARA , Akira FUJISAKI , Seiichi HAYASHI
CPC classification number: H01S3/0912 , H01S3/067 , H01S3/06716 , H01S3/0675 , H01S3/06754 , H01S3/08009 , H01S3/094003 , H01S3/09408 , H01S3/0941 , H01S3/10069 , H01S3/1312 , H01S3/2308
Abstract: A laser device includes an optical fiber laser unit including an amplification optical fiber, a plurality of pumping light sources outputting pumping lights for optically pumping the amplification optical fiber, and a controller controlling the pumping light sources. When an instruction value for supplying a predetermined driving electric current to each of the pumping light sources is input to the controller, the controller conducts a control of supplying a compensated electric current value as a driving electric current obtained by multiplying an initial electric current value corresponding to the instruction value by a compensation coefficient and supplying the compensated electric current value to each of the pumping light sources. The compensation coefficient is set to restrain a decrease in a power with time of a laser light output from the optical fiber laser unit.
Abstract translation: 激光装置包括：包括放大光纤的光纤激光器单元，输出用于光学泵浦放大光纤的泵浦光的多个泵浦光源;以及控制泵浦光源的控制器。 当向控制器输入用于向每个泵浦光源提供预定的驱动电流的指令值时，控制器执行将补偿电流值提供作为驱动电流的控制，该驱动电流是通过将对应于 通过补偿系数提供给指令值，并将补偿的电流值提供给每个泵浦光源。 补偿系数被设定为抑制从光纤激光单元输出的激光的时间的降低。
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公开(公告)号：US20170110847A1
公开(公告)日：2017-04-20
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
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.
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公开(公告)号：US20180375279A1
公开(公告)日：2018-12-27
申请号：US16054654
申请日：2018-08-03
Applicant: FURUKAWA ELECTRIC CO., LTD.
Inventor： Koji KAJIWARA , Keishi TAKAKI
Abstract: An optical module comprising a first optical fiber corresponding to an incidence side for laser light a second optical fiber corresponding to an emission side for the laser light; and a connection protecting portion that is provided and located so as to cover a connection site for optically connecting the first optical fiber and the second optical fiber, wherein the second optical fiber has a larger core diameter than the first optical fiber, the connection site is a site where a core portion of the first optical fiber and a core portion of the second optical fiber are connected to each other in a discontinuous shape, and the connection protecting portion is formed of a thermally conductive protective material and/or a photorefractive protective material includes refractive index that is equal to or higher than that of a clad portion of the first optical fiber.
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公开(公告)号：US20200083661A1
公开(公告)日：2020-03-12
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
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.
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