High-power all-fiber laser based on multi-core fiber

Abstract

The invention discloses a high-power all-fiber laser based on a multi-core fiber. The laser comprises a seed source, a pumping source, a pumping beam gathering device, an end cap and a multi-core fiber. The multi-core fiber comprises a wrapping layer whose two ends are stripped and multiple fiber cores. Ends of the fiber cores are mutually welded so that one single fiber core is formed. The part outside the wrapping layer of the single fiber core is provided with an input end and an output end. The input end is welded to the seed source and the output end is welded to the end cap. The wrapping layer is welded to the output end of the pumping beam gathering device. The laser performs multipass amplification on laser signals; pumping coupling absorption efficiency is high; stability and reliability of the laser system are high; and compared with the prior art, while a certain factor of the multi-core fiber is ensured, the multi-core fiber has a quite big wrapping layer diameter. Thus, while the pumping laser has certain brightness, quite high-power pumping coupling is achieved.

Description

technical field [0001] The invention relates to the technical field of high-power fiber lasers, in particular to a high-power all-fiber laser based on multi-core fibers. Background technique [0002] In recent years, with the development of high-brightness semiconductor pumping technology and double-clad fiber manufacturing process, the output power of fiber laser has increased rapidly. In 2002, the output of 1kW was achieved, and in 2009, it reached the threshold of 10kW. At present, fiber lasers have been widely used. There are many technical obstacles to further increase the power of single-fiber near-single-mode fiber lasers, and the difficulty in increasing the pump coupling power has become one of the main technical obstacles. There are two solutions for higher power pump coupling, one is to increase the brightness of the pump source, and the other is to increase the pump-receiving area of ​​the laser while maintaining the pump absorption intensity. [0003] The conc...

AI Technical Summary

Problems solved by technology

However, due to the low pump coupling absorption efficiency of this configuration, the laser cannot achieve high conversion efficiency

At the same time, the pumping optical path of this structure is a spatial structure, resulting in the entire laser system not being an all-fiber structure, which cannot guarantee the high stability and reliability of the laser system.

Therefore, in the development of high-power fiber lasers, disk-shaped fiber lasers have not achieved greater development.

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