MOPA structure fiber laser device capable of restraining SBS effect

Abstract

The invention discloses a device for restraining the SBS effect in the amplification stage of an MOPA structure high-power narrow-linewidth fiber laser device. The device comprises pumping sources, coupling devices and a gain fiber, wherein the pumping sources are coupled into the gain fiber through the coupling devices at different positions of the gain fiber, and then spatial multipoint pumping is realized. The change of the number and spatial distribution of the pumping sources can affect the spatial distribution of the number of inverted population in gain media so as to affect the process of amplification of amplifier signal light and SBS scattered light, through reasonable design of the position and power of a pumping point, amplification of SBS scattered light can be weakened on the premise that the power of an amplifier is guaranteed, the SBS effect of the amplifier can be effectively restrained, and the output power of the narrow-linewidth fiber laser device can be improved.

Description

technical field [0001] The invention relates to a device for suppressing the SBS effect of an amplifier stage of an MOPA structure narrow-linewidth fiber laser, in particular to a device for suppressing the SBS effect of a high-power fiber amplifier by using space multi-point pumping. Background technique [0002] Fiber lasers have the advantages of high electro-optical efficiency and good beam quality. In recent years, they have been developed rapidly, and various indicators such as output power have repeatedly hit new highs, and their application range has continued to expand. Among them, narrow linewidth lasers have important application prospects in the fields of lidar, frequency conversion and coherent synthesis. The all-fiber laser based on the main oscillator power amplification (MOPA) structure has a compact structure and stable operation, and is an effective solution for the development of narrow-linewidth fiber lasers to high power. However, due to the stimulated ...

AI Technical Summary

Problems solved by technology

[0008] These methods have their own advantages and disadvantages, such as increasing the fiber radius, which is simple and easy to operate, but in order to ensure the beam quality of the laser, the radius increase is limited, and the suppression effect is not significant; the specially designed fiber structure is complex, and the design and production process It is quite difficult, so many designs and concepts only stay at the level of theoretical analysis, and there are no experimental reports and engineering applications

In practice, it is often necessary to combine multiple methods to work together to form a certain limit on the SBS effect of the amplifier.

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