Opt Lett. 2018 Jul 1;43(13):3080-3083. doi: 10.1364/OL.43.003080.
A continuous-wave erbium-doped ytterbium-free fiber laser generates a record-breaking pump-power-limited output power of 656 W at ∼1601 nm when cladding pumped by 0.98 μm diode lasers. The slope efficiency was 35.6% with respect to launched pump power, and the beam quality factor (M) was ∼10.5. This M value excludes a fraction ∼25% of the power that emerged from the cladding, which we attribute in part to mode coupling between the 146 μm core and 700 μm inner cladding. Whereas these parameters are adequate for in-band tandem pumping of Tm-doped fiber lasers, we predict that an output power of over 1 kW is possible through pumping with state-of-the-art 0.98 μm diode lasers, even with a smaller core that allows for improved beam quality.
连续波掺铒镱自由光纤激光器在 0.98μm 半导体激光器抽运包层时，于 1601nm 处获得了 656W 的创纪录的受泵浦功率限制的输出功率。相对于注入的泵浦功率，斜率效率为 35.6%，光束质量因子（M）约为 10.5。这个 M 值排除了约 25%的从包层中出射的功率，我们部分归因于 146μm 纤芯和 700μm 内包层之间的模式耦合。虽然这些参数对于 Tm 掺杂光纤激光器的带内串联泵浦已经足够，但我们预测，通过使用最先进的 0.98μm 半导体激光器进行泵浦，即使使用允许提高光束质量的较小纤芯，也有可能获得超过 1kW 的输出功率。
