公开(公告)号：US20220123515A1

公开(公告)日：2022-04-21

申请号：US17424078

申请日：2020-02-27

Applicant: Fujikura Ltd.

Inventor： Takashi Hasunuma ,  Shinichi Sakamoto ,  Yasuto Chiba ,  Wataru Kiyoyama ,  Yutaka Yamaguchi

IPC: H01S3/091 ,  H01S3/094 ,  G01J1/42

Abstract: A laser device includes at least one light source; a delivery fiber configured to propagate laser light launched from the light source; a monitor fiber optically coupled to the delivery fiber and configured to propagate a part of the light propagating in a direction opposite to a propagation direction of the laser light in the delivery fiber, and a light receiving unit configured to receive the light propagated by the monitor fiber. The light receiving unit is configured to detect first light included in a wavelength band of visible light.

公开(公告)号：US20200012058A1

公开(公告)日：2020-01-09

申请号：US16482470

申请日：2018-01-30

Applicant: FUJIKURA LTD.

Inventor： Takanori Yamauchi ,  Wataru Kiyoyama ,  Shinichi Sakamoto ,  Akari Takahashi

IPC: G02B6/42 ,  G02B6/36 ,  H01L31/0232 ,  G01J1/44 ,  G01J1/04

Abstract: A photodetector includes: a substrate; an optical fiber disposed on the substrate; and a photodetection element fixed to the substrate, and that detects scattered light of light guided by the optical fiber. The photodetector further includes: a first fixing member and a second fixing member that fix the optical fiber to the substrate.

公开(公告)号：US12107379B2

公开(公告)日：2024-10-01

申请号：US17422267

申请日：2020-02-27

Applicant: Fujikura Ltd.

Inventor： Shinichi Sakamoto ,  Yasuto Chiba ,  Wataru Kiyoyama ,  Yutaka Yamaguchi ,  Takashi Hasunuma

IPC: H01S3/094 ,  B23K26/70 ,  H01S3/00 ,  H01S3/067

CPC classification number: H01S3/094053 ,  B23K26/705 ,  H01S3/0014 ,  H01S3/005 ,  H01S3/06708

Abstract: A laser device includes at least one light source; a delivery fiber that is configured to propagate of laser light emitted from the light source; and a first light detection unit and a second light detection unit configured to detect a part of light propagating in a direction opposite to a propagation direction of the laser light through the delivery fiber. The first light detection unit detects first light included in a wavelength band of visible light. The second light detection unit detects second light included in a wavelength band of near-infrared light.

公开(公告)号：US11940321B2

公开(公告)日：2024-03-26

申请号：US17254485

申请日：2019-06-21

Applicant: Fujikura Ltd.

Inventor： Shinichi Sakamoto ,  Wataru Kiyoyama

IPC: G01J1/42 ,  G01J1/04 ,  G02B6/42 ,  H01S3/13 ,  H01S3/23 ,  G02B6/28 ,  H01S3/00

CPC classification number: G01J1/4228 ,  G01J1/0425 ,  G02B6/4286 ,  H01S3/1306 ,  H01S3/2383 ,  G02B6/2808 ,  G02B6/429 ,  H01S3/0014 ,  H01S3/1305

Abstract: A photodetection device including: first optical fibers; a second optical fiber; an optical combiner having: an end face connected to an end face of each of the first optical fibers; and another end face connected to an end face of the second optical fiber; a first photodetector that detects an intensity of light propagating through at least one of the first optical fibers; a second photodetector that detects Rayleigh scattering of light propagating through the second optical fiber; and a calculator that calculates the intensity of light propagating in a predetermined direction through the first optical fibers or the second optical fiber, from a result of detection by the first photodetector and a result of detection by the second photodetector.

公开(公告)号：US20220094132A1

公开(公告)日：2022-03-24

申请号：US17422267

申请日：2020-02-27

Applicant: Fujikura Ltd.

Inventor： Shinichi Sakamoto ,  Yasuto Chiba ,  Wataru Kiyoyama ,  Yutaka Yamaguchi ,  Takashi Hasunuma

IPC: H01S3/094 ,  H01S3/067 ,  H01S3/00

Abstract: A laser device includes at least one light source; a delivery fiber that is configured to propagate of laser light emitted from the light source; and a first light detection unit and a second light detection unit configured to detect a part of light propagating in a direction opposite to a propagation direction of the laser light through the delivery fiber. The first light detection unit detects first light included in a wavelength band of visible light. The second light detection unit detects second light included in a wavelength band of near-infrared light.

公开(公告)号：US20210181015A1

公开(公告)日：2021-06-17

申请号：US17254485

申请日：2019-06-21

Applicant: Fujikura Ltd.

Inventor： Shinichi Sakamoto ,  Wataru Kiyoyama

IPC: G01J1/42 ,  G02B6/42 ,  G01J1/04

Abstract: A photodetection device including: first optical fibers; a second optical fiber; an optical combiner having: an end face connected to an end face of each of the first optical fibers; and another end face connected to an end face of the second optical fiber; a first photodetector that detects an intensity of light propagating through at least one of the first optical fibers; a second photodetector that detects Rayleigh scattering of light propagating through the second optical fiber; and a calculator that calculates the intensity of light propagating in a predetermined direction through the first optical fibers or the second optical fiber, from a result of detection by the first photodetector and a result of detection by the second photodetector.