Quasi-continuous fiber laser device for modularized beam combining

Abstract

The invention relates to the technical field of fiber laser devices, in particular to a quasi-continuous fiber laser device for modularized beam combining. The quasi-continuous fiber laser device comprises a plurality of fiber laser device modules, a beam combining device and an output device. Each fiber laser device module comprises N+M pump laser devices, a first beam combiner, a high-reflectivity optical grating, a gain optical fiber, a low-reflectivity optical grating and a second beam combiner. The beam combining device comprises a plurality of input optical fibers and an output optical fiber. The output device comprises a wrapping layer optical stripping device and an optical fiber output head. The gain optical fibers are excited by the pump laser devices on the two sides for generating lasers so as to form the fiber laser device modules, multiple beams of lasers generated by the same fiber laser device modules are combined through the beam combining device according to the modularized concept, and therefore the high-power quasi-continuous laser is formed; the power of the laser can reach several thousand kilowatts; the fiber laser device has the advantages of being easy to manufacture, high in stability and flexible in production.

Description

technical field [0001] The invention relates to the technical field of fiber lasers, in particular to a modular beam combining quasi-continuous fiber laser. Background technique [0002] Fiber lasers have the advantages of good beam quality, high electro-optic conversion efficiency, small size, maintenance-free, long life, etc. In recent years, processing equipment based on fiber laser technology, such as laser marking machines, engraving machines, cutting machines, welding machines, etc. It is widely used in various industries. Although compared with traditional lasers, fiber lasers have many advantages, but their power is low, and most of them are small and medium power fiber lasers of hundreds of watts. Due to the influence of nonlinear effects such as abyss scattering and stimulated Raman scattering, as well as the limitations of factors such as thermal damage to the fiber core, the output power of a single fiber is relatively limited, and the highest output power is ab...

AI Technical Summary

Problems solved by technology

Although compared with traditional lasers, fiber lasers have many advantages, but their power is low, and most of them are small and medium power fiber lasers of hundreds of watts. Due to the influence of nonlinear effects such as abyss scattering and stimulated Raman scattering, as well as the limitations of factors such as thermal damage to the fiber core, the output power of a single fiber is relatively limited, and the highest output power is about 1500W.

Although the power can be further increased by using a doped fiber with a thicker core, the cost of the doped fiber with a thicker core is high and the power supply is limited, so this power boosting method is generally not used

In the technical fields of automobile manufacturing, shipbuilding, and aviation manufacturing, when lasers are used for cutting and welding of metal and non-metallic materials, the laser power is often required to reach the kilowatt level or more, so traditional fiber lasers cannot meet the requirements. Application requirements

For this reason, researchers consider modularizing multiple fiber lasers, and combine them into one output through the beam combining device, so that the power of the fiber laser can be increased. Currently, the more commonly used beam combining methods are: coherent combining, grating method and space Coupling, where: the coherent combination structure is complex and difficult to adjust, the grating method requires high system precision and poor stability; spatial coupling, the coupled laser is usually spatial light, and it is difficult to realize flexible production of lasers

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