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Spectroscopic analysis and laser simulations of Yb3+/Ho3+ co-doped lead-germanate glass
Optical Materials Express ( IF 2.8 ) Pub Date : 2020-10-12 , DOI: 10.1364/ome.404375
Mamoona Khalid , D. G. Lancaster , Heike Ebendorff-Heidepriem

The potential of a Yb3+/Ho3+ co-doped lead-germanate glass as a laser gain medium around 2 µm is investigated by spectroscopic measurements and rate equation modelling. The glass, based on the molar composition of 56GeO2-31PbO-4Ga2O3-9Na2O and co-doped with 1.5 mol% Yb2O3 and 0.4 mol% Ho2O3, possesses a broad Ho3+ emission spectrum covering ∼1.8 µm to 2.2 µm for the Ho3+:5I7→5I8 transition, and a long 5I7 fluorescence lifetime of (7.74 ± 0.03) ms. We estimate a competitive 2 µm quantum efficiency (76%) compared to other germanate glasses. The intensity parameters are calculated to be Ω2 = 3.0×10−20 cm2, Ω4 = 1.2×10−20 cm2 and Ω6 = 2.0×10−20 cm2. The energy transfer analysis from Ho3+ to OH group represents a low Ho3+-OH clustering factor (γ = 0.15) compared to phosphate and other germanate glasses. Applying these parameters to the laser model predicts > 15% laser slope efficiency for cavity losses ≤ 0.5 dB using 976 nm pumping. The results show that this Yb3+/Ho3+ co-doped lead-germanate glass is a promising candidate for efficient lasing around 2 µm.

中文翻译:

Yb3+/Ho3+共掺杂锗酸铅玻璃的光谱分析和激光模拟

通过光谱测量和速率方程建模研究了 Yb3+/Ho3+ 共掺杂锗酸铅玻璃作为 2 µm 左右激光增益介质的潜力。该玻璃基于 56GeO2-31PbO-4Ga2O3-9Na2O 的摩尔组成并与 1.5 mol% Yb2O3 和 0.4 mol% Ho2O3 共掺杂,具有宽的 Ho3+ 发射光谱,对于 Ho3+:5I7 而言,覆盖范围为~1.8 µm 至 2.2 µm 5I8 跃迁,以及 (7.74 ± 0.03) ms 的长 5I7 荧光寿命。与其他锗酸盐玻璃相比,我们估计具有竞争力的 2 µm 量子效率 (76%)。强度参数计算为 Ω2 = 3.0×10−20 cm2,Ω4 = 1.2×10−20 cm2 和 Ω6 = 2.0×10−20 cm2。与磷酸盐和其他锗酸盐玻璃相比,从 Ho3+ 到 OH 基团的能量转移分析代表较低的 Ho3+-OH 聚类因子 (γ = 0.15)。将这些参数应用到激光模型中,对于使用 976 nm 泵浦的腔损耗 ≤ 0.5 dB,预测 > 15% 的激光斜率效率。结果表明,这种 Yb3+/Ho3+ 共掺杂锗酸铅玻璃是有效的 2 µm 左右激光的候选材料。
更新日期:2020-10-12
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