报道了平均功率超过百瓦的单频掺铥全光纤结构主振荡功率放大器。使用线宽小于100 kHz、中心波长为1.97 μm的单频种子源进行级联放大, 主放大器的斜率效率为50%。监测放大器的回光功率和光谱, 没有发现受激布里渊散射以及其他非线性效应。通过增加泵浦功率, 可以获得更高功率的掺铥单频放大输出。

We demonstrate a monolithic single frequency Tm-doped fiber amplifier with output power of 51.5 W. A single frequency fiber laser at 1.97 $\mathrm {\mu} $m is amplified by a cascaded master oscillator power amplifier (MOPA) system with all-fiber configuration. The optical-to-optical conversion efficiency of the main fiber amplifier is 45%. No amplified spontaneous emission (ASE) or stimulated Brillouin scattering (SBS) effect is observed in the fiber amplifier. The output power could be further scaled by launching more pump power.