STRUCTURE FOR ELIMINATING ESCAPING LIGHT, AND FIBER LASER

Title:

STRUCTURE FOR ELIMINATING ESCAPING LIGHT, AND FIBER LASER

Document Type and Number:

WIPO Patent Application WO/2015/115637

Kind Code:

A1

Abstract:

　This structure for eliminating escaping light (70) is used to eliminate escaping light in an optical fiber (140) having a core (160), a cladding (162) having a lower refractive index than the core (160), and a sheathing material (164) having a higher refractive index than the cladding (162). The structure for eliminating escaping light (70) is provided with: a fiber housing part (72) for housing a portion of the optical fiber (140); a sheathing material extension part (175) produced by extending a portion of the sheathing material (164) in the lengthwise direction of the optical fiber (140) within the fiber housing part (72), thereby sheathing a portion of the entire circumference of the cladding (162); and a cladding exposure part (174) in which a section of the entire circumference of the cladding (162) other than the sheathing material extension part (175) is exposed within the fiber housing part (72). Optionally, the sheathing material (164) may be sheathed by a resin (76) having a refractive index equal to or lower than the refractive index of the sheathing material (164). The sheathing material extension part (175) is formed, e.g., at an angle of 180° or less centered on the axis of the optical fiber (140), in a cross section perpendicular to the axis.

Inventors:

TANAKA HIRONORI (JP)

Application Number:

PCT/JP2015/052807

Publication Date:

August 06, 2015

Filing Date:

February 02, 2015

Export Citation:

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Assignee:

FUJIKURA LTD (JP)

International Classes:

G02B6/255; G02B6/02; G02B6/44; H01S3/067

Domestic Patent References:

WO2013001734A1

2013-01-03

Foreign References:

JP2009069492A	2009-04-02
JP2011186399A	2011-09-22
JPH1144823A	1999-02-16
JPS63214630A	1988-09-07
JP2009116076A	2009-05-28

Other References: