High-power narrow-linewidth fiber laser based on rayleigh scattering and working method thereof

Abstract

The invention relates to a high-power narrow-linewidth fiber laser based on rayleigh scattering and a working method thereof. The laser comprises a pump laser, a wavelength division multiplexer, a YAG-SiO2 doped fiber, a first fiber circulator, a polarization controller, a second fiber circulator, a YAG-SiO2 fiber, a variable optical attenuator and a faraday rotation mirror which are arranged along the light path. The first fiber circulator is also connected with high-reflectivity fiber Bragg gratings. The output end of the first fiber circulator is also connected with a fiber coupler. One output end of the fiber coupler is connected with the wavelength division multiplexer. The other output end of the fiber coupler is the output end of the whole laser. The wavelength division multiplexer,the YAG-SiO2 doped fiber, the first fiber circulator, the polarization controller, the second fiber circulator and the fiber coupler form a ring cavity together.

Description

technical field [0001] The invention relates to a high-power narrow-linewidth fiber laser based on Rayleigh scattering and a working method thereof, belonging to the technical field of fiber lasers. Background technique [0002] High-power narrow-linewidth single-frequency fiber laser can achieve high output power while ensuring that the laser has good temporal and spatial coherence, low noise, compact structure, and good beam quality. It is widely used in industrial production, scientific research, and national defense. have important applications. For example, high-power narrow-linewidth single-frequency fiber lasers can be used in beam synthesis, lidar, gravitational wave detection, optical fiber communication, nonlinear frequency conversion, photoelectric countermeasures and other fields. [0003] In the production process of high-power single-frequency fiber laser, due to the characteristics of small core area and long length of the fiber, it is easy to produce nonline...

AI Technical Summary

Problems solved by technology

The method of segmented tapering is not only complicated in manufacturing process, but also the stability of the non-uniform optical fiber after tapering decreases, and the transmission loss increases

In order to accumulate stimulated Rayleigh scattering, inhomogeneous fibers on the order of hundreds of meters are usually used, which greatly limits the performance of lasers

[0005] The method of reducing the length of the gain fiber can lower the threshold value, but the doping concentration level of the commonly used silica matrix gain fiber cannot be further increased due to the concentration quenching effect of rare earth ions, so the pump absorption coefficient is generally biased. Low, reducing the length of the gain fiber will also reduce the conversion efficiency of the laser and affect its output power

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