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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。
Stimulated Brillouin scattering (SBS) effect is an important factor affecting the power increase of a single-frequency narrow-line fiber laser amplifier. Taking white noise as RF signal source, phase modulation technology was used to design and set up a set of three main oscillator power amplification all-fiber laser system. The relationship between the spectral width of signal light and the SBS threshold of optical fiber amplifier was analyzed and studied. By changing the amplitude of white noise signal, the spectral width of signal was accurately controlled. The center wavelength was 1030.93nm and the linewidth was 0.9GHz. The average A narrow linewidth quasi-continuous laser with a power of 90W outputs a beam quality factor of 1.28 and 1.27 for the X and Y directions, respectively. This study provides a reliable theoretical and experimental basis for the industrialization of high power single-frequency narrow-linewidth fiber laser.