Zhang Lei, Jiang Huawei, Cui Shuzhen, Feng Yan
Opt Lett. 2014 Apr 1;39(7):1933-6. doi: 10.1364/OL.39.001933.
An integrated ytterbium-Raman fiber amplifier architecture is proposed for power scaling of a Raman fiber laser. It is an ytterbium (Yb) fiber amplifier seeded with a double or multiple wavelength laser and followed by a passive Raman fiber. The bluest wavelength light gets amplified in the Yb fiber and the power is transferred to redder wavelengths in the following Raman fiber. A proof of principle experiment demonstrates a 300 W all-fiber linearly polarized single mode amplifier at 1120 nm with an optical efficiency of 70%, limited only by available pump power. The amplifier consists of 4 m of Yb-doped fiber and 20 m of germanium-doped fiber, and seeded with a laser emitting at 1070 and 1120 nm. The power evolution of the 1070 and 1120 nm light inside the amplifier is investigated, both numerically and experimentally. The possibility of power scaling to over kilowatt levels is discussed.
提出了一种用于拉曼光纤激光器功率扩展的集成镱拉曼光纤放大器架构。它是一种镱（Yb）光纤放大器，由双波长或多波长激光器注入种子光，随后接一根无源拉曼光纤。波长最蓝的光在Yb光纤中被放大，功率在后续的拉曼光纤中转移到波长更红的光上。原理验证实验展示了一个在1120 nm波长处输出300 W全光纤线性偏振单模放大器，光效率为70%，仅受可用泵浦功率限制。该放大器由4 m掺镱光纤和20 m掺锗光纤组成，并由发射波长为1070 nm和1120 nm的激光器注入种子光。对放大器内部1070 nm和1120 nm光的功率演变进行了数值和实验研究。讨论了功率扩展到千瓦以上水平的可能性。
