Fabrication and Characterizations of Yb:YAG Transparent Ceramics Using Alcohol-water Co-precipitation Method
Fabrication and Characterizations of Yb:YAG Transparent Ceramics Using Alcohol-water Co-precipitation Method
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DOI：
10.15541/jim20200231
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发表时间：
2021
影响因子：
1.7
通讯作者：
X. Huang;Yumin Liu;Yang Liu;Xiaoying Li;Yagang Feng;Xiaopu Chen;P. Chen;Xin Liu;Tengfei Xie;Li-xiang Jiang
中科院分区：
文献类型：
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作者：
X. Huang;Yumin Liu;Yang Liu;Xiaoying Li;Yagang Feng;Xiaopu Chen;P. Chen;Xin Liu;Tengfei Xie;Li-xiang Jiang
Yb：YAG透明陶瓷具有吸收和发射波段宽、增益高、热负荷低、荧光寿命长、量子效率高等优点，在高功率固体激光器中具有很大的应用潜力。因此Yb：YAG透明陶瓷逐渐受到人们的重视。本研究优化了粉体的性能并制备了高透明的Yb:YAG陶瓷。以碳酸氢铵为沉淀剂, 分别以纯水或乙醇/水混合物为溶剂, 采用共沉淀法合成了5at%Yb:YAG纳米粉体。所有在1250 °C煅烧4小时的粉末均显示出纯YAG相。与纯水溶剂法相比，醇-水溶剂法制备的5at%Yb：YAG粉体具有更小的平均晶粒尺寸和更低的团聚度。以乙醇-水为溶剂，在无烧结助剂的条件下，采用真空烧结法成功制备了5at%Yb：YAG透明陶瓷。研究了在1500-1825 °C烧结20 h和1800 °C烧结10-50 h时陶瓷的显微结构和同轴透过率。除1825 °C烧结20 h的样品外，其余样品均为均匀的显微结构。在1800 °C烧结50 h的样品在1100 nm和400 nm（2.2 mm厚度）处的透射率最高，分别为78.6%和76.7%。计算得到的吸收截面和发射截面分别为5.03×10 cm（937 nm）和13.48×10 cm（1031 nm）。因此，采用乙醇-水为溶剂，采用粉末法制备出了具有高透光率和均匀微观结构的Yb：YAG陶瓷。
Yb doped YAG transparent ceramics have great potential as gain medium for high-power solid-state lasers due to many advantages, such as broad absorption and emission bands, high gain, low thermal loading, long fluorescence lifetime and high quantum efficiency. So Yb:YAG transparent ceramics have gradually been paid more attention. In this work, we aimed at optimizing the properties of powders to fabricate highly transparent Yb:YAG ceramics. 5at%Yb:YAG nano-powders were synthesized via the co-precipitation method by using ammonium hydrogen carbonate as the precipitant, and pure water or alcohol-water mixture as the solvent. All powders calcined at 1250 °C for 4 h exhibit a pure YAG phase. Compared to the one with pure water solvent, the 5at%Yb:YAG powder synthesized with alcohol-water solvent exhibits smaller average crystallite size and lower agglomeration degree. 5at%Yb:YAG transparent ceramics were successfully fabricated by vacuum sintering without sintering additives from the obtained powder with alcohol-water solvent. The microstructure and in-line transmittance of the ceramics sintered at 1500–1825 °C for 20 h and 1800 °C for 10–50 h were investigated. All ceramic samples show a homogeneous microstructure except for that sintered at 1825 °C for 20 h. The sample sintered at 1800 °C for 50 h shows the highest in-line transmittance of 78.6% at 1100 nm and 76.7% at 400 nm (2.2 mm thickness). The calculated absorption and emission cross sections are 5.03×10 cm at 937 nm and 13.48×10 cm at 1031 nm, respectively. Therefore, Yb:YAG ceramics with high optical transparency and uniform microstructure have been fabricated from powder with alcohol-water solvent.