Further power scaling and stable laser performance were demonstrated in the Yb/Ce codoped aluminosilicate fiber fabricated through low-temperature chelate gas phase deposition technique. The molar ratio of Ce/Yb was designed and optimized to be 0.58 for low background loss, effective photodarkening suppression, and no additional thermal load. The background loss of this active fiber was 4.7 dB/km and its photodarkening loss at equilibrium was as low as 3.9 dB/m at 633 nm. Benefiting from low-temperature deposition technique, the fiber showed uniform core composition devoid of clustering and central ‘dip’ of refractive index profile and 0.19 mol% Yb2O3 was homogeneously dissolved into the fiber core plus with 0.41 mol% Al2O3, 0.11 mol% Ce2O3, and 0.32 mol% SiF4. Based on a master oscillator power amplifier laser setup, 5.04 kW laser output at 1079.80 nm was achieved with a slope efficiency of 81.1%. Stabilized at 5kW-level laser for over 60 minutes, the output power presented almost no power degradation, directly confirming a noticeable photodarkening mitigation.

中文翻译：

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Yb/Ce 共掺铝硅酸盐光纤，具有高激光稳定性，适用于多千瓦级激光器

通过低温螯合气相沉积技术制造的 Yb/Ce 共掺杂铝硅酸盐纤维进一步证明了功率缩放和稳定的激光性能。Ce/Yb 的摩尔比被设计和优化为 0.58，以实现低背景损失、有效的光暗抑制和无额外热负荷。这种有源光纤的背景损耗为 4.7 dB/km，其平衡光暗化损耗在 633 nm 处低至 3.9 dB/m。受益于低温沉积技术，光纤显示出均匀的纤芯成分，没有聚集和折射率分布的中心“倾角”，0.19 mol% Yb2O3 均匀溶解在光纤纤芯中，另外还有 0.41 mol% Al2O3、0.11 mol% Ce2O3、和 0.32 mol% SiF4。基于主振荡器功率放大器激光器设置，1079 时的 5.04 kW 激光输出。以 81.1% 的斜率效率实现了 80 nm。稳定在 5kW 级激光 60 分钟以上，输出功率几乎没有出现功率下降，直接证实了明显的光暗化缓解。