Chen Yizhu, Fan Chenchen, Yao Tianfu, Xiao Hu, Leng Jinyong, Zhou Pu, Nemov Ilya N, Kuznetsov Alexey G, Babin Sergey A
Opt Lett. 2021 Mar 1;46(5):1185-1188. doi: 10.1364/OL.416740.
A brightness-enhanced random Raman fiber laser (RRFL) with maximum power of 306 W at 1120 nm is demonstrated. A half-open cavity is built based on a graded-index (GRIN) passive fiber and single high-reflective fiber Bragg grating written in it directly. Due to the beam cleanup effect in the GRIN fiber enhanced in the half-open RRFL cavity, the output beam quality factor is improved from 9.15 (pump) to 1.76-2.35 (Stokes) depending on power, while the pump-Stokes brightness enhancement (BE) factor increases proportionally to output power reaching 6.1 at maximum. To the best of our knowledge, this is the highest power GRIN RRFL with BE.
展示了一种在1120nm处最大功率为306W的亮度增强型随机拉曼光纤激光器（RRFL）。基于渐变折射率（GRIN）无源光纤构建了一个半开放腔，并在其中直接写入单个高反射光纤布拉格光栅。由于在半开放RRFL腔中增强的GRIN光纤中的光束净化效应，输出光束质量因子根据功率从9.15（泵浦）提高到1.76 - 2.35（斯托克斯），而泵浦 - 斯托克斯亮度增强（BE）因子与输出功率成比例增加，最大值达到6.1。据我们所知，这是具有亮度增强的最高功率GRIN RRFL。
