Raman fiber laser

Abstract

The invention discloses a Raman fiber laser. The Raman fiber laser comprises a high-reflectivity fiber grating, a Raman laser seed source, an optical fiber laser pumping source and a Raman laser amplifier which are connected in sequence, wherein the Raman laser seed source comprises a reflection end cascade grating string, a Raman gain fiber and an output end cascade grating string which are connected in sequence, the reflection end cascade grating string is connected with the high-reflectivity fiber grating, the optical fiber laser pumping source comprises a semiconductor pumping laser, an optical fiber side surface beam combiner, a reverse output grating, an ytterbium-doped optical fiber and a forward output grating which are connected in sequence, the semiconductor pumping laser is connected with the output end cascade grating string, and the forward output grating is connected with the Raman laser amplifier. The Raman fiber laser has the advantages of being simple in structure, high in pump laser utilization efficiency, high in Raman optical fiber laser conversion efficiency and the like.

Description

technical field [0001] The invention relates to the field of optical fiber and laser technology, in particular to a Raman fiber laser with high conversion efficiency and high power. Background technique [0002] In recent years, fiber lasers have been developed rapidly, including power, beam quality, and all-fiber structures. This enables the rapid application and development of fiber lasers in the fields of industry, national defense and scientific research. [0003] However, limited by the intrinsic properties of the fiber material, the substantial increase in fiber power only occurs in a specific wavelength window. For example, the single-mode output power of ytterbium-doped fiber lasers at 1 micron wavelength has grown from 10kW in 2009 to 100kW now, while the power of other wavelengths has not increased significantly. This severely limits the development of fiber lasers in other wavelength applications. For example, in the resection of lung metastases, Dr. Rolle and ...

AI Technical Summary

Problems solved by technology

The traditional Nd:YAG solution for generating 1318.8nm lasers has small gain, low conversion efficiency, difficulty in obtaining high power, and a relatively large system

Although the semiconductor laser can greatly improve the light-to-light conversion efficiency and obtain a compact laser system, its beam quality is poor

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