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受激布里渊散射(SBS)效应是影响连续波单频光纤激光放大器功率提升的重要因素,就传能光纤长度对连续波单频全光纤激光放大器SBS阈值功率的影响进行了实验研究。采用线宽为2.35kHz的非平面环形腔(NPRO)结构种子光源,搭建了两级级联单频连续波全光纤激光放大器,通过改变主放大器增益光纤与输出光隔离器之间传能光纤的长度,检测主放大器回光功率和光谱随输出激光功率的变化,分析了无源传能光纤长度对连续波单频全光纤激光放大器SBS阈值功率的影响,实验结果与理论计算结果相符。
The stimulated Brillouin scattering (SBS) effect is an important factor that affects the power of a continuous-wave single-frequency fiber laser amplifier. The influence of the length of the transmission fiber on the threshold power of a continuous-wave single-frequency all-fiber laser amplifier is studied experimentally. A two-stage cascaded single-frequency continuous-wave all-fiber laser amplifier was constructed by using non-planar ring cavity (NPRO) structured seed light with a linewidth of 2.35 kHz. By changing the power of the main amplifier gain fiber and the output optical isolator Length of the main amplifier to detect the return power of the main amplifier and the change of the spectrum with the output laser power. The influence of the length of the passive transmission fiber on the threshold power of the SBS single-frequency all-fiber laser amplifier is analyzed. The experimental results are consistent with the theoretical calculation results.