We have demonstrated an industrial 6 kW single-stage end-pumped all-fiber laser oscillator based on a conventional large mode area ytterbium-doped fiber (YDF) with 30 μm core diameter and 600 μm inner-cladding diameter. As a result, the fiber oscillator achieved a maximum output power of 6.07 kW at a central wavelength of ∼1080 nm with a slope efficiency of ∼65.8%. The power of Raman Stoke light was 21.6 dB smaller than the signal light at the output power of 6.07 kW. For industrial application, the stimulated Raman scattering effect was further suppressed by employing a 50 μm-core delivery fiber, and no sign of dynamic transverse mode instability comes into view during the whole experiment. The power stability measurement at ∼6 kW operation was carried out for continuous 2 h, and the power fluctuation was within 0.31%. To the best of our knowledge, this is the first detailed demonstration of industrial 6 kW high-stability single-stage all-fiber laser oscillator based on conventional YDF. The results provide a significant guidance for the construction of more than 6 kW output power single-stage end-pumped all-fiber laser systems.

我们已经证明了基于传统的大模场面积掺镱光纤（YDF）用30工业6千瓦单级端面泵浦全光纤激光振荡器μ米纤芯直径和600 μ中号内包层直径。结果，光纤振荡器在〜1080 nm的中心波长处获得了6.07 kW的最大输出功率，斜率效率为〜65.8％。在输出功率6.07 kW时，拉曼斯托克灯的功率比信号灯小21.6 dB。对于工业应用，受激拉曼散射效果通过采用50进一步抑制μ在整个实验过程中，没有观察到m芯传输光纤，也没有动态横向模态不稳定性的迹象。连续约2 h在〜6 kW操作下进行功率稳定性测量，功率波动在0.31％以内。据我们所知，这是首次基于传统YDF的工业6 kW高稳定性单级全光纤激光振荡器的详细演示。结果为构建超过6 kW输出功率的单级端泵全光纤激光器系统提供了重要指导。