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：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：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：US11609380B2

公开(公告)日：2023-03-21

申请号：US17423986

申请日：2020-03-11

Applicant: Fujikura Ltd.

Inventor： Yutaka Yamaguchi ,  Shinichi Sakamoto ,  Yasuto Chiba ,  Tatsuya Kishi

IPC: G02B6/02 ,  G02B6/14 ,  G02B6/255 ,  H01S3/00 ,  H01S3/23 ,  G02B6/028 ,  G02B6/036 ,  G02B6/245 ,  H01S5/40

Abstract: A laser device includes: a laser unit that outputs laser light; an output end that launches the laser light; a first fusion splice portion; and a second fusion splice portion. In each of the first fusion splice portion and the second fusion splice portion, two multi-mode fibers are fusion-spliced. Each of the two multi-mode fibers include a core through which the laser light propagates and a cladding that surrounds the core. The first fusion splice portion is disposed closer to the laser unit than is the second fusion splice portion. At least a part of the core in the first fusion splice portion contains a dopant that is the same type as a dopant contained in the cladding in the first fusion splice portion for decreasing a refractive index.

公开(公告)号：US20220091324A1

公开(公告)日：2022-03-24

申请号：US17423986

申请日：2020-03-11

Applicant: Fujikura Ltd.

Inventor： Yutaka Yamaguchi ,  Shinichi Sakamoto ,  Yasuto Chiba ,  Tatsuya Kishi

IPC: G02B6/02 ,  G02B6/255

Abstract: A laser device includes: a laser unit that outputs laser light; an output end that launches the laser light; a first fusion splice portion; and a second fusion splice portion. In each of the first fusion splice portion and the second fusion splice portion, two multi-mode fibers are fusion-spliced. Each of the two multi-mode fibers include a core through which the laser light propagates and a cladding that surrounds the core. The first fusion splice portion is disposed closer to the laser unit than is the second fusion splice portion. At least a part of the core in the first fusion splice portion contains a dopant that is the same type as a dopant contained in the cladding in the first fusion splice portion for decreasing a refractive index.