Liu Yehui, Zhang Fangfang, Zhao Nan, Lin Xianfeng, Liao Lei, Wang Yibo, Peng Jinggang, Li Haiqing, Yang LuYun, Dai NengLi, Li Jinyan
Opt Express. 2018 Feb 5;26(3):3421-3426. doi: 10.1364/OE.26.003421.
We report a novel center-sunken and cladding-trenched Yb-doped fiber, which was fabricated by a modified chemical vapor deposition process with a solution-doping technique. The simulation results showed that the fiber with a core diameter of 40 µm and a numerical aperture of 0.043 has a 1217 µm effective mode area at 1080 nm. It is also disclosed that the leakage loss can be reduced lower than 0.01 dB/m for the LP mode, while over 80 dB/m for the LP mode by optimizing the bending radius as 14 cm. A 456 W laser output was observed in a MOPA structure. The laser slope efficiency was measured to be 79% and the M was less than 1.1, which confirmed the single mode operation of the large mode area center-sunken cladding-trenched Yb-doped fiber.
我们报道了一种新型的中心凹陷和包层刻槽掺镱光纤，它是通过改进的化学气相沉积工艺结合溶液掺杂技术制造的。模拟结果表明，芯径为40 µm、数值孔径为0.043的光纤在1080 nm处具有1217 µm²的有效模场面积。还发现，对于LP模式，通过将弯曲半径优化为14 cm，泄漏损耗可降低至低于0.01 dB/m，而对于LP模式则超过80 dB/m。在MOPA结构中观察到了456 W的激光输出。测得激光斜率效率为79%，M小于1.1，这证实了大模场面积中心凹陷包层刻槽掺镱光纤的单模运行。
