信号光谱宽特性对单频光纤放大器SBS阈值的影响

Influence of Signal Spectral Width Characteristic on SBS Threshold of Single Frequency Fiber Amplifier

受激布里渊散射(SBS)效应是影响单频窄线宽光纤激光放大器功率提高的重要因素。以白噪声作为射频信号源,采用相位调制技术,设计并搭建了一套三级主振荡功率放大全光纤激光系统。分析和研究了信号光频谱宽度与光纤放大器系统SBS阈值之间的关系,通过改变白噪声信号的幅值,实现精确控制信号光谱宽,获得了中心波长为1030.93nm、线宽为0.9GHz、平均功率为90W的窄线宽准连续激光输出,相应的X方向与Y方向的光束质量因子分别为1.28和1.27。该研究为实现高功率单频窄线宽光纤激光器的产业化提供了可靠的理论和实验基础。

The stimulated Brillouin scattering （SBS） effect is an important factor affecting the power boost of single frequency narrow line width fiber laser amplifiers. Utilizing white noise as the radio frequency signal source, an all fiber laser system with three stage master oscillator power amplifier is designed and built by phase modulation technique. The relationship between the spectral widths of the signal light and the SBS thresholds of the fiber amplifier system is analyzed and studied. By changing the amplitudes of the white noise signal, the spectral widths of the signal can be accurately controlled, and the narrow line width quasi continuous laser output with a central wavelength of 1030.93 nm, a line width of 0.9 GHz and an average power of 90 W is obtained. The corresponding X direction and Y direction of the beam quality factors are 1.28 and 1.27, respectively. This research provides a reliable theoretical and experimental basis for the industrialization of high power single frequency narrow line width fiber lasers.