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在基于主振荡放大结构的光纤放大器中,窄线宽、时域稳定的种子源对抑制非线性效应和获得数千瓦窄线宽的激光输出至关重要。随机光纤激光器基于瑞利散射和拉曼增益,在时域稳定性上独具优势,近年来得到了广泛研究。将基于自研光纤光栅搭建的1018nm光纤激光作为抽运源,采用半开放腔随机激光形式输出1067.6nm激光,并基于窄带光栅滤波和三级放大结构,实现了42.8 W、10.6GHz线宽的激光输出,线宽在放大过程中保持不变,此光源特别适合作为数千瓦级窄线宽光纤放大器的种子源。
In a fiber amplifier based on a main oscillator amplification structure, a narrow-linewidth, time-domain seed source is crucial to suppress non-linear effects and obtain a laser output with a narrow linewidth of several kilowatts. Based on Rayleigh scattering and Raman gain, stochastic fiber lasers have unique advantages in time domain stability and have been widely studied in recent years. The 1018nm fiber laser based on self-study fiber gratings was used as the pumping source, and 1067.6nm laser was output by the semi-open cavity laser and the laser with 42.8W and 10.6GHz linewidth was realized based on narrow-band grating filtering and three-stage amplification. The output, linewidth remains constant during amplification, and this light source is particularly suitable as a seed source for thousands of watts of narrow linewidth fiber amplifiers.