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Fiber laser apparatus, and method of detecting abnormality of fiber laser apparatus

A fiber laser, fiber optic technology, applied in laser monitoring devices, lasers, laser parts and other directions, can solve problems such as increased economic losses

Active Publication Date: 2013-07-24
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this fiber fusing occurs, the economic loss increases because the optical fiber components that existed before reaching the light source are destroyed

Method used

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  • Fiber laser apparatus, and method of detecting abnormality of fiber laser apparatus
  • Fiber laser apparatus, and method of detecting abnormality of fiber laser apparatus
  • Fiber laser apparatus, and method of detecting abnormality of fiber laser apparatus

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no. 1 approach

[0059] figure 1 It is a figure which shows the structural example of 1st Embodiment of this invention. As shown in this figure, the fiber laser device 1 of the first embodiment has the following components as main components: a terminal part 11, an optical fiber 12, and an excitation optical multiplexer (TFB (Tapered Fiber Bundle, tapered fiber bundle)) 13, 17 , HR14, amplifying optical fiber 15, OC16, excitation LD (Laser Diode, laser diode) 18, 20, excitation LD driving power 19, 21 (corresponding to the "stop part" in the claim), control part 40 (corresponding to In the "judgment section" in the claims), PD (Photo Diode, photodiode) 50 (corresponding to the "detection section" in the claims), excitation light cut filter 51 (corresponding to the "attenuation section" in the claims ), and the output optics 60. It should be noted that the terminal portion 11, the optical fiber 12, the excitation optical multiplexers 13, 17, HR14, the amplification optical fiber 15, the OC16,...

Embodiment approach

[0080] As described above, according to the first embodiment of the present invention, the leaked signal light from the fusion splicing portion 36 of the optical fiber 12 is detected, and when the intensity Lp of the leaked signal light becomes smaller than the predetermined threshold value Th, it is determined that the optical fiber has occurred. Fuse, so the occurrence of fiber fusing can be reliably detected. In addition, in the first embodiment, since it is possible to detect fiber fusing occurring in any part of the fiber laser device 1 by providing only one PD 50 , it is possible to reliably detect the occurrence of fiber fusing at low cost.

[0081] It should be noted that since the fiber length of each optical component is several tens of centimeters (cm) as described above, in order to prevent the propagation of the fiber fusing to other components, the time from the occurrence of the fiber fusing to the stop of the excitation LD is preferably, for example, within 100...

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Abstract

The objective of the present invention is to detect any abnormality occurring on a fiber, with reliability. Provided is a fiber laser apparatus (1) that generates a laser beam by guiding excitation light into an optical fiber, wherein the fiber laser apparatus (1) is characterized in comprising: a detection unit (PD50) for detecting leaking signal light, which is signal light leaking out from the core of the fiber; an evaluation unit (control unit (40)) for evaluating that an abnormality has occurred, when the intensity of the leaking signal light detected by the detection unit decreases; and a stopping unit (power supply for driving excitation LD) for stopping the guiding in of excitation light, when the evaluation unit evaluates that an abnormality has occurred.

Description

technical field [0001] The invention relates to a fiber laser device and an abnormality detection method of the fiber laser device. Background technique [0002] Recently, fiber laser devices using optical fibers for excitation devices or amplification devices have become more powerful, and their applications as processing lasers have been expanding. [0003] In such a fiber laser device, the core of the fiber may be irreversibly damaged toward the light source, that is, a phenomenon called "fiber fusing" may occur. When this fiber fusing occurs, economical loss increases because optical fiber components existing before reaching the light source are destroyed. [0004] At present, as a method of detecting such an optical fiber fusing, there is the method of detecting the light and temperature of the optical fiber fusing disclosed in Patent Document 1, and the method of branching and observing the excitation light disclosed in Patent Document 2, and when the intensity of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/06
CPCH01S3/067H01S3/10015H01S3/094011H01S3/0014H01S3/094007H01S3/1312H01S3/10069
Inventor 宫户泰三柏木孝介江森芳博藤崎晃
Owner FURUKAWA ELECTRIC CO LTD
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