公开(公告)号：US20230036091A1

公开(公告)日：2023-02-02

申请号：US17788677

申请日：2021-01-28

Applicant: NLIGHT, INC.

Inventor： Juan Carlos LUGO ,  Teemu KOKKI ,  Roger FARROW ,  Dahv A.V. KLINER

IPC: H01S3/00 ,  H01S3/067

Abstract: Some embodiments may include a fiber laser including two or more input fibers and an output fiber to deliver a beam to a workpiece, the fiber laser comprising. The fiber laser may include a combiner having ends and a length, wherein the combiner is arranged to release, from its length, a portion of back-reflected light received from the output fiber at an output end of the ends from the combiner, the combiner including: a capillary tube to enclose part of the two or more input fibers at an input end of the ends of the combiner, the capillary tube having ends and a length located between the ends of the capillary tube; and a cladding light stripper (CLS) defined by part of the length of the capillary tube, wherein the CLS provides the release of the portion of the back-reflected light. Other embodiments may be disclosed and/or claimed.

公开(公告)号：US20230144603A1

公开(公告)日：2023-05-11

申请号：US18149891

申请日：2023-01-04

Applicant: nLIGHT, Inc.

Inventor： Teemu KOKKI ,  Christopher LUETJEN ,  Ryan HAWKE

IPC: H01S3/067 ,  H01S3/16 ,  H01S3/08018 ,  G02B6/02

CPC classification number: H01S3/06733 ,  H01S3/1618 ,  H01S3/08018 ,  G02B6/02085 ,  G02B2006/0209

Abstract: Multi-clad optical fiber cladding light stripper (CLS) comprising an inner cladding with one or more recessed surface regions to remove light propagating within the inner cladding. A CLS may comprise such recessed surface regions along two or more azimuthal angles about the fiber axis, for example to improve stripping efficiency. One or more dimensions, or spatial distribution, of the recessed surface regions may be randomized, for example to improve stripping uniformity across a multiplicity of modes propagating within a cladding. Adjacent recessed surface regions may abut, for example, end-to-end, as segments of a recess that occupies a majority, or even an entirety, of the length of a fiber surrounded by a heat sink. One or more dimensions, or angular position, of individual ones of the abutted recessed surface regions may vary, according to a regular or irregular pattern.