Fan Chenchen, Xiao Hu, Yao Tianfu, Xu Jiangming, Chen Yizhu, Leng Jinyong, Zhou Pu
Opt Lett. 2021 Jul 15;46(14):3432-3435. doi: 10.1364/OL.431273.
In this Letter, we demonstrate a high-power Raman fiber amplifier with excellent beam quality based on graded-index fiber. The Yb-doped fiber laser (YDFL) and bandwidth-tunable amplified spontaneous emission (ASE) source are employed as the pump source to compare the laser performance separately. When the ASE with a bandwidth of 8 nm is employed, a maximum power of 943 W at 1130 nm is achieved, which is twice that pumped by YDFL. The beam quality factor at maximum output power is 1.6, with a brightness enhancement (BE) factor of 27. To the best of our knowledge, this is the best beam quality and BE factor based on pure Raman gain with output power of over 100 W.
在本信函中，我们展示了一种基于渐变折射率光纤的具有优异光束质量的高功率拉曼光纤放大器。采用掺镱光纤激光器（YDFL）和带宽可调谐放大自发辐射（ASE）源作为泵浦源，分别比较激光性能。当采用带宽为8 nm的ASE时，在1130 nm处实现了943 W的最大功率，这是由YDFL泵浦时功率的两倍。最大输出功率下的光束质量因子为1.6，亮度增强（BE）因子为27。据我们所知，这是基于纯拉曼增益且输出功率超过100 W时的最佳光束质量和BE因子。
