Ytterbium‐doped calcium fluoride transparent ceramics is considered as a promising laser gain medium. How to prepare low scattering loss ceramics is the main challenge at present. In this study, a simple route of hot‐pressing method was introduced to fabricate high optical quality of Yb: CaF₂ laser ceramics with different concentration of Yb ions. The influence of Yb concentration on the particle sizes of the powders, microstructure, fluorescence spectra, output power, and laser emitting spectra of Yb: CaF₂ transparent ceramics was discussed. About 976 nm LD pumped CW laser operation has been demonstrated in 1, 2, 4, and 5 at.% Yb doped CaF₂ ceramics. A maximum average output power of 0.809 W was obtained for the 5 at.% Yb: CaF₂ ceramics with the slope efficiency was 26%.

中文翻译：

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Yb浓度对Yb：CaF2透明陶瓷的微观结构，光谱和激光性能的影响

掺tter氟化钙透明陶瓷被认为是有前途的激光增益介质。当前如何制备低散射损耗的陶瓷是主要的挑战。在这项研究中，介绍了一种简单的热压方法来制造高光学质量的Yb：具有不同Yb离子浓度的CaF ₂激光陶瓷。讨论了Yb浓度对Yb：CaF ₂透明陶瓷粉末的粒径，显微结构，荧光光谱，输出功率和激光发射光谱的影响。在1、2、4和5 at。％Yb掺杂的CaF ₂陶瓷中已经证明了约976 nm LD泵浦连续波激光操作。对于5 at。％Yb：CaF ₂获得的最大平均输出功率为0.809 W 陶瓷的斜率效率为26％。