Abstract The novel Ho,Pr:CaGdAlO4 crystal was grown successfully by the Czochralski method. The crystal structure, segregation, absorption and luminescence properties were investigated in detail. The concentration of Pr3+ and Ho3+ ions are 0.76 × 1020 cm−3 and 3.49 × 1020 cm−3, respectively. The effect of Pr3+ co-doping on the ~2.86 μm emission of Ho3+ was analyzed. The fluorescence intensity of Ho,Pr:CaGdAlO4 is three times higher than that of Ho:CaGdAlO4. The efficiency of energy transfer from Ho3+: 5I7 to Pr3+: 3F2 energy level was calculated to be 96.2%, which restrains the self-termination effect to a large extent in Ho,Pr:CaGdAlO4 crystal. The absorption cross-section at 1146 nm is 0.83 × 10−20 cm2 with the FWHM of 19 nm. The fluorescence branching ratio, emission cross-section and measured fluorescence lifetime at 2.86 μm are 12.7%, 2.38 × 10−20 cm2 and 0.194 ms, respectively. All these results suggest that Ho,Pr:CaGdAlO4 crystal is promising candidate for the 2.86 μm laser application pumped by the 1150 nm Raman fiber laser.

中文翻译：

---

来自 Ho,Pr:CaGdAlO4 晶体的增强型 2.86 μm 发射

摘要 采用直拉法成功生长了新型Ho,Pr:CaGdAlO4晶体。详细研究了晶体结构、偏析、吸收和发光特性。Pr3+ 和Ho3+ 离子的浓度分别为0.76 × 1020 cm-3 和3.49 × 1020 cm-3。分析了 Pr3+ 共掺杂对 Ho3+~2.86 μm 发射的影响。Ho,Pr:CaGdAlO4 的荧光强度是 Ho:CaGdAlO4 的三倍。从Ho3+:5I7到Pr3+:3F2能级的能量转移效率计算为96.2%，这在很大程度上抑制了Ho,Pr:CaGdAlO4晶体的自终止效应。1146 nm 处的吸收截面为 0.83 × 10−20 cm2，FWHM 为 19 nm。2.86 μm 处的荧光分支比、发射截面和实测荧光寿命为 12.7%, 2. 分别为 38 × 10−20 cm2 和 0.194 ms。所有这些结果表明，Ho,Pr:CaGdAlO4 晶体是 1150 nm 拉曼光纤激光器泵浦的 2.86 μm 激光应用的有希望的候选者。