Guan Xianchao, Yang Changsheng, Gu Quan, Wang Weiwei, Tan Tianyi, Zhao Qilai, Lin Wei, Wei Xiaoming, Yang Zhongmin, Xu Shanhui
Opt Lett. 2020 Apr 15;45(8):2343-2346. doi: 10.1364/OL.388826.
Based on core- and in-band-pumped polarization-maintaining ${{\rm Tm}^{3 + }}$Tm-doped single-cladding fiber (PM-TSF, the core diameter is 9 µm) by a 1610 nm fiber laser and a distributed Bragg reflector seed laser, a linearly polarized single-frequency fiber laser (LP-SFFL) at 1950 nm with an output power of 55.3 W and a laser linewidth of 6.95 kHz is demonstrated. The output beam qualities of ${M}_x^2$Mx2 and ${ M}_y^2$My2 are measured to be 1.01 and 1.03, respectively. The slope efficiency with respect to the launched pump power is 71.0%, in comparison with a theoretical quantum efficiency of 82.6%. A polarization-extinction ratio of 19 dB and an optical signal-to-noise ratio of 58 dB are obtained from the 1950 nm LP-SFFL. To the best of our knowledge, to date, this is the highest power of 2.0 µm SFFL output directly from a strict single-mode active fiber. Our experiment offers a promising solution to the current limitations of the high-performance fiber lasers at 2.0 µm, which is particularly essential for coherent detection.
基于1610nm光纤激光器和分布式布拉格反射器种子激光器对纤芯和带内泵浦的保偏掺铥单包层光纤（PM - TSF，纤芯直径为9μm）进行泵浦，展示了一台输出功率为55.3W、激光线宽为6.95kHz的1950nm线偏振单频光纤激光器（LP - SFFL）。测得其x方向和y方向的光束质量因子$M_x^2$和$M_y^2$分别为1.01和1.03。相对于泵浦光注入功率的斜率效率为71.0%，与之相比理论量子效率为82.6%。从1950nm的LP - SFFL获得了19dB的偏振消光比和58dB的光信噪比。据我们所知，迄今为止，这是直接从严格单模有源光纤输出的2.0μm单频光纤激光器的最高功率。我们的实验为当前2.0μm高性能光纤激光器的局限性提供了一个有前景的解决方案，这对于相干探测尤为重要。
