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Fiber laser device, production method for fiber laser device, and setting method

A fiber laser and manufacturing method technology, applied in laser welding equipment, lasers, manufacturing tools, etc., can solve problems such as power increase, and achieve the effect of suppressing power increase and reducing the possibility

Active Publication Date: 2020-11-06
THE FUJIKURA CABLE WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in existing fiber laser devices, there is room for further suppressing the increase in the power of Raman scattered light and further reducing the possibility of laser oscillation destabilization.

Method used

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  • Fiber laser device, production method for fiber laser device, and setting method
  • Fiber laser device, production method for fiber laser device, and setting method
  • Fiber laser device, production method for fiber laser device, and setting method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach 〕

[0025] (Structure of fiber laser device)

[0026] refer to figure 1 The configuration of the fiber laser device FL according to the first embodiment of the present invention will be described. figure 1 It is a block diagram showing the configuration of the fiber laser device FL according to the present embodiment.

[0027] The fiber laser device FL is a processing laser device including a single optical fiber for amplification. Fiber laser device FL such as figure 1 As shown, there are m excitation light sources PS1~PSm, m excitation fibers PF1~PFm, excitation combiner PC, high reflection fiber Bragg grating FBG-HR, amplification fiber AF, low reflection fiber Bragg grating FBG-LR, transmission fiber DF, and irradiation head H. The excitation light sources PS1 to PSm and the excitation fibers PF1 to PFm correspond to each other one-to-one. Here, m is an arbitrary natural number greater than or equal to 2, and represents the number of excitation light sources PS1 to PSm an...

no. 2 approach 〕

[0102] (Structure of fiber laser device)

[0103] refer to Figure 4 The configuration of the fiber laser system FLS according to the second embodiment of the present invention will be described. Figure 4 It is a block diagram showing the configuration of the fiber laser device FLS according to the present embodiment.

[0104] The fiber laser device FLS is a processing laser device including a plurality of optical fibers for amplification. Fiber laser device FLS such as Figure 4 It shows n fiber laser units FLU1-FLUn, n transmission fibers DF1-DFn, an output combiner OC, a transmission fiber DF, and an irradiation head H. The fiber laser units FLU1-FLUn and the delivery fibers DF1-DFn correspond to each other one-to-one. Here, n is an arbitrary natural number greater than or equal to 2, and represents the number of fiber laser units FLU1 to FLUn, transmission fibers DF1 to DFn, and Raman filters RF1 to RFn described later. In addition, in Figure 4 In , a configuration...

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Abstract

The present invention suppresses increases in the power of Raman scattered light and reduces the likelihood that laser light oscillation will become unstable. According to the present invention, a fiber laser device (FL) is provided with a Raman filter (RF) that reflects a portion of Raman scattered light such that 10(2*g1*L1-am) / 10+10(2*g1*L1+2*g2*L2-2*at-ar) / 10<10(2*g1*L1-2*g2*L2-ar).

Description

technical field [0001] The present invention relates to fiber laser devices. In addition, it relates to a method of manufacturing a fiber laser device. In addition, it relates to a setting method for setting the reflection attenuation amount of a processable object in a fiber laser device. Background technique [0002] In the field of material processing, fiber laser devices have attracted attention as laser processing machines excellent in maintainability and processability. However, in fiber laser devices, nonlinear optical effects such as stimulated Raman scattering tend to occur when the power density of laser light guided in the fiber increases. Furthermore, it is known that laser oscillation in a fiber laser device becomes unstable as the power of Raman scattered light due to stimulated Raman scattering increases (see Patent Document 1). [0003] Patent document 1: Japanese laid-open patent publication "Japanese Patent Laid-Open No. 2015-95641" [0004] However, in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/00
CPCH01S3/0675H01S3/302H01S3/0078H01S2301/03H01S3/2308H01S3/094003H01S3/094053G02B6/02085H01S3/1618H01S3/2383B23K26/009
Inventor 阪本真一
Owner THE FUJIKURA CABLE WORKS LTD