Method for improving Raman threshold of fiber laser system and application

A fiber laser and fiber laser technology, applied in the direction of the structure/shape of the active medium, can solve the problems of unsuitable high-power laser systems, etc., and achieve the effect of raising the Raman threshold, simple operation, and raising the Raman threshold

Pending Publication Date: 2022-07-08
WUHAN RAYCUS FIBER LASER TECHNOLOGY CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a method and application for increasing the Raman threshold of the fiber laser system, to solve the problem that the prior art needs to introduce insertion loss when raising the Raman threshold, and is not suitable for Technical Issues of High Power Laser Systems

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  • Method for improving Raman threshold of fiber laser system and application
  • Method for improving Raman threshold of fiber laser system and application
  • Method for improving Raman threshold of fiber laser system and application

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Embodiment 1

[0039] This embodiment provides a fiber laser system based on the method for improving the Raman threshold of a fiber laser system provided in the first aspect of the present invention, and the overall structure is as follows figure 2 As shown, it includes: a laser module 1 , a first cladding optical stripper 2 , a second cladding optical stripper 3 , an output optical cable 4 and a mode scrambler 5 . Among them, the output of the laser module is a double-sided pump single-cavity structure, which is a single-cavity single-module output laser 10. The schematic diagram is as follows image 3 where (a), (b), and (c) are the schematic diagrams of three different types of single-cavity single-module output lasers; the diameter of the output fiber of laser module 1 is 25 / 250 μm, which is different from that of the first cladding. The optical fiber of optical stripper 2 (fiber diameter is 50 / 360μm) is spliced, and the optical fiber of the second cladding optical stripper 3 (fiber di...

Embodiment 2

[0041] This embodiment provides a fiber laser system based on the method for improving the Raman threshold of a fiber laser system provided in the first aspect of the present invention, and the overall structure is also as follows figure 2 As shown, it includes: a laser module 1 , a first cladding optical stripper 2 , a second cladding optical stripper 3 , an output optical cable 4 and a mode scrambler 5 . Among them, the laser module 1 is a single-module output laser 10 with a MOPA structure, as shown in the schematic diagram. Figure 5 As shown; the fiber diameter of the output fiber of the laser module is 75 / 360 μm, which is spliced ​​with the optical fiber of the first cladding stripper 2 (the fiber diameter is 75 / 360 μm), and is fused with the optical fiber of the second cladding stripper 3 ( The diameter of the optical fiber is 100 / 360 μm) and then spliced ​​with the output optical cable 4. The mode scrambler 5 is placed between the first cladding optical stripper 2 and...

Embodiment 3

[0043] This embodiment provides a fiber laser system based on the method for improving the Raman threshold of a fiber laser system provided in the first aspect of the present invention, and the overall structure is also as follows figure 2 As shown, it includes: a laser module 1 , a first cladding optical stripper 2 , a second cladding optical stripper 3 , an output optical cable 4 and a mode scrambler 5 . Among them, the laser module 1 is a multi-module beam combining output laser 10, as shown in the figure Figure 7 shown; the fiber diameter of the output fiber of the laser module is 100 / 360 μm, which is spliced ​​with the optical fiber of the first cladding stripper 2 (fiber diameter is 100 / 360 μm), and is fused with the optical fiber of the second cladding stripper 3 ( The optical fiber diameter is 100 / 360 μm) and spliced, and then spliced ​​with the output optical cable 4, and the mode scrambler 5 was placed between the first cladding optical stripper 2 and the second cl...

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Abstract

The invention discloses a method for improving a Raman threshold value of an optical fiber laser system and application, and belongs to the technical field of optical fiber lasers. The method for improving the Raman threshold value of the optical fiber laser system comprises the step of carrying out mode scrambling on an energy transmission optical fiber in the optical fiber laser system by adopting a mode scrambler so as to improve the Raman threshold value. The corresponding optical fiber laser system comprises a laser module, an output optical cable and a mode scrambler, wherein the laser module and the output optical cable are connected through the energy transmission optical fiber; the mode scrambler is located between the laser module and the output optical cable and used for conducting mode scrambling on the energy transmission optical fiber so as to improve the Raman threshold value. An optical fiber device does not need to be fused in a laser system and the structure of an optical system does not need to be changed, operation is easy, insertion loss does not exist, the Raman threshold value improving effect is obvious, and meanwhile the method is suitable for a high-power laser system.

Description

technical field [0001] The invention belongs to the technical field of fiber lasers, and more particularly, relates to a method and application for improving the Raman threshold of a fiber laser system. Background technique [0002] Fiber lasers are more and more widely used in the industrial field, and the further improvement of laser power is severely restricted by the Raman nonlinear effect. Because the Raman nonlinear effect increases to a certain extent, the backward Raman scattered light will damage the internal beam combiner and pump source of the laser and other devices, and the forward Raman scattered light will gradually absorb the energy of the signal light and convert it into a Mann scattered light, resulting in poor stability of the laser output power and serious deterioration of the beam quality. [0003] The existing method for raising the Raman threshold of a laser system is to add a tilted chirped fiber grating at the output end or between the seed and the ...

Claims

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Application Information

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IPC IPC(8): H01S3/067
CPCH01S3/067H01S3/0675
Inventor 闫大鹏施建宏李进延刘正胡浩伟
Owner WUHAN RAYCUS FIBER LASER TECHNOLOGY CO LTD
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