Core-band-pumped fiber laser

Abstract

The invention relates to a fiber core tandem pumped fiber laser. The fiber core tandem pumped fiber laser is characterized in that the fiber core tandem pumped fiber laser comprises a pump module (01), a resonant cavity module (02) and an amplification stage module (03), wherein the pump module (01) is in low-loss butt fusion with the resonant cavity module (02); the resonant cavity module (02) isin low-loss butt fusion with the amplification stage module (03); the pump module (01) includes a semiconductor laser (1), a semiconductor laser (2), ... , and a semiconductor laser N, wherein N is smaller than or equal to 20; N pump beam combiners (30) are provided, wherein N is smaller than or equal to 20; the pump beam combiners (30) are (N+1)*1 type pump beam combiners; and the pump beam combiners (30) comprise pump alarms (20). The fiber core tandem pumped fiber laser can realize fiber core tandem pumped and amplified output in a large-mode double-clad optical fiber. Since tandem pump light and signal light are generated in the same optical fiber, the introduction of a coupling device is not required. The fiber core tandem pumped fiber laser of the invention has the advantages of simplicity and high integration degree. With the fiber core tandem pumped fiber laser of the invention adopted, the fiber core tandem pumped and amplified output of the high-power fiber laser can be improved.

Description

Technical field [0001] The invention belongs to the field of lasers, in particular to the technical field of high-power all-fiber lasers. [0002] technical background [0003] All-fiber laser has the advantages of compact structure, high integration, excellent beam quality, high conversion efficiency and good heat dissipation performance. It has a wide application demand in industrial market and national defense and military field. With the increase of application demand, the power requirement of fiber laser is higher and higher. The power output of fiber laser directly pumped by semiconductor laser is limited by the limitation of power and brightness of semiconductor laser, and the limitation of thermal effect and nonlinear effect of fiber and fiber devices themselves. Co-band pumping is recognized as an effective way to improve the output power of single fiber laser. It converts the output light of a semiconductor laser with low brightness into a fiber laser with high brightnes...

AI Technical Summary

Problems solved by technology

In view of the low absorption efficiency of the 1018nm laser cladding by the ytterbium-doped double-clad laser, fiber core co-band pumping can be used to improve the absorption efficiency of ytterbium particles to 1018nm laser, but most of the current core co-band pumping structures are based on single-mode fiber or The implementation of optical fiber with small mode field is limited by the power of the fiber core coupling device. The laser power that can be imported is at the level of several watts to tens of watts, which is not conducive to the realization of high-power co-band pump amplification output.

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