Zeng Lingfa, Xi Xiaoming, Ye Yun, Zhang Hanwei, Wang Xiaolin, Pan Zhiyong, Wang Zefeng, Xu Xiaojun
Opt Lett. 2020 Oct 15;45(20):5792-5795. doi: 10.1364/OL.404893.
In order to balance the mitigation of transverse mode instability and stimulated Raman scattering effect in the high power fiber lasers, a specially designed Yb-doped fiber, named spindle-shaped Yb-doped fiber, was fabricated with a core/cladding diameter of 20/400 µm at both ends and 30/600 µm in the middle. Based on this fiber, an all-fiber laser oscillator was built and over 3 kW near-single-mode ( factor ∼1.3) laser was achieved with an optical-to-optical conversion efficiency of 78.4%. While operating at the maximum power, the transverse mode instability is well mitigated and the stimulated Raman scattering effect is well suppressed (>34 lower than signal laser). Further power scaling is promising by optimizing the structure of the Yb-doped fiber.
为了平衡高功率光纤激光器中横向模式不稳定性的缓解和受激拉曼散射效应，制备了一种特殊设计的掺镱光纤，称为纺锤形掺镱光纤，其两端的纤芯/包层直径为20/400 µm，中间为30/600 µm。基于这种光纤，构建了全光纤激光振荡器，实现了超过3 kW的近单模（M²因子约为1.3）激光，光光转换效率为78.4%。在最大功率运行时，横向模式不稳定性得到了很好的缓解，受激拉曼散射效应得到了很好的抑制（比信号激光低>34 dB）。通过优化掺镱光纤的结构，进一步提高功率是有希望的。
