Abstract In this paper, we reported mixed garnet laser ceramic gain media with composition of 15 at.% Yb:LuxY3-xAl5O12 (x = 0, 0.75, 1.5, 3.0, Yb:LuYAG) fabricated by the solid state reactive sintering in vacuum. After being sintered at 1850 °C for 30 h, all the Yb:LuYAG ceramics have dense microstructure and high optical quality. The in-line transmittances of the 1.6 mm thick ceramics with x = 0, 0.75, 1.5 and 3.0 are 84.8%, 84.1%, 82.4% and 83.4% at 1100 nm wavelength, respectively. The influences of the Lu3+ content on the absorption and emission spectra were discussed. With the increase of Lu3+ content, the crystal field increases, causing a blue shift of position and bigger absorption coefficient of the about 938 nm absorption peaks. The main emission peaks for all Yb:LuYAG ceramics retain at 1030 nm. The samples have shown a high laser emission slope efficiency, near to exceeding 60% in optimized output coupling conditions. The comparable optical properties and excellent thermo-mechanical qualities mean that the Yb:LuYAG ceramics are promising gain media used for high power laser application.

中文翻译：

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Yb:LuxY3-xAl5O12透明陶瓷的制备、微观结构和光学性能

摘要 在本文中，我们报道了混合石榴石激光陶瓷增益介质，其组成为 15 at.% Yb:LuxY3-xAl5O12 (x = 0, 0.75, 1.5, 3.0, Yb:LuYAG)，通过真空固态反应烧结制备。在 1850 °C 下烧结 30 h 后，所有 Yb:LuYAG 陶瓷都具有致密的微观结构和高光学质量。x = 0、0.75、1.5 和 3.0 的 1.6 mm 厚陶瓷的在线透射率在 1100 nm 波长下分别为 84.8%、84.1%、82.4% 和 83.4%。讨论了Lu3+含量对吸收光谱和发射光谱的影响。随着Lu3+含量的增加，晶场增大，引起938 nm左右吸收峰位置蓝移和更大的吸收系数。所有 Yb:LuYAG 陶瓷的主要发射峰保持在 1030 nm。样品显示出高激光发射斜率效率，在优化的输出耦合条件下接近超过 60%。相当的光学特性和出色的热机械特性意味着 Yb:LuYAG 陶瓷是用于高功率激光应用的有前途的增益介质。