Abstract Yb3+ ion was introduced as a sensitizer for commercial 980 nm pump source utilization in Yb3+/Dy3+ co-doped YAP crystal for the first time. An intense broadband 3 μm emission (Dy3+:6H13/2 → 6H15/2 transition) in Yb3+/Dy3+:YAP crystal was demonstrated. As compared with Dy3+ singly-doped YAP crystal under 802 nm OPO excitation, the larger emission cross-section (=4.25 × 10−21 cm2) and effective emission bandwidth (=316 nm) were obtained in Yb3+/Dy3+:YAP crystal under 979 nm OPO laser excitation, which make it favorable for tunable lasers. The energy transfer efficiency from Yb3+ to Dy3+ was obtained as high as 97.2%. The greatly reduced near-infrared emission of Yb3+:2F5/2 → 2F7/2 transition and largely shortened lifetime of Yb3+:2F5/2, also reveal the efficient energy transfer from Yb3+ to Dy3+. The energy transfer micro-parameters were calculated by spectral overlapping integral method, and the main energy transfer channel is determined. In addition, the energy dispersive X-ray spectroscopy, X-ray diffraction and Raman spectrum were measured in Yb3+/Dy3+:YAP crystal. Rietveld refinement was also employed to investigate the variation in lattice parameters in Yb3+/Dy3+:YAP crystal. It can be concluded that Yb3+/Dy3+:YAP is an excellent candidate for achieving mid-infrared laser.

中文翻译：

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在 979 nm 激发下，Yb3+/Dy3+:YAlO3 晶体中增强的宽带 3 μm 发射

摘要 首次在 Yb3+/Dy3+ 共掺杂 YAP 晶体中引入 Yb3+ 离子作为商业 980 nm 泵浦源利用的敏化剂。证明了 Yb3+/Dy3+:YAP 晶体中的强宽带 3 μm 发射（Dy3+:6H13/2 → 6H15/2 跃迁）。与 802 nm OPO 激发下的 Dy3+ 单掺杂 YAP 晶体相比，Yb3+/Dy3+:YAP 晶体在 979 下获得了更大的发射截面（=4.25 × 10−21 cm2）和有效发射带宽（=316 nm） nm OPO 激光激发，这使其有利于可调谐激光器。从 Yb3+ 到 Dy3+ 的能量转移效率高达 97.2%。Yb3+:2F5/2 → 2F7/2 跃迁的近红外发射大大减少，Yb3+:2F5/2 的寿命大大缩短，也揭示了从 Yb3+ 到 Dy3+ 的有效能量转移。采用光谱重叠积分法计算能量传递微参数，确定主要的能量传递通道。此外，在 Yb3+/Dy3+:YAP 晶体中测量了能量色散 X 射线光谱、X 射线衍射和拉曼光谱。Rietveld 精修也用于研究 Yb3+/Dy3+:YAP 晶体中晶格参数的变化。可以得出结论，Yb3+/Dy3+:YAP 是实现中红外激光的绝佳候选者。