10．6GHz线宽保持随机光纤激光种子源

10.6 GHz Linewidth Maintained Random Fiber Laser Seed Source

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 which is based on master oscillator power amplifier structure, generating a seed source with narrow linewidth and stable temporal property is very important for suppressing nonlinear effects and obtaining multi-kilowatts power. The random fiber laser based on Rayleigh scattering and Raman gain has been widely investigated due to the superior performance on temporal stability. Taking 1018 nm fiber laser based on self- fabricated fiber grating as the pump source, a 10.6 GHz, 1067.6 nm random fiber laser as the seed source is achieved by adopting a half open cavity. A three-stage power amplifier structure boosts the seed to 42.8 W, the linewidtb is maintained during the power scaling process, which shows that the light source has a great potential to be used as the seed source of multi-kilowatts fiber amplifier.