Liu Jun, Liu Peng, Wang Jun, Xu Xiaodong, Li Dongzhen, Zhang Jian, Nie Xinming
Jiangsu Key Laboratories of Advanced Laser Materials and Devices, School of Physics and Electronics Engineering, Jiangsu Normal University, Xuzhou 221116, China.
Key Laboratory of Transparent Opto-Functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
Materials (Basel). 2018 Mar 22;11(4):475. doi: 10.3390/ma11040475.
In this paper, we report the fabrication of high-quality 5 at. % Er ions doped SrF₂ transparent ceramics, the potential candidate materials for a mid-infrared laser-gain medium by hot-pressing at 700 °C for 40 h using a chemically-derived powder. The phase structure, densification, and microstructure evolution of the Er:SrF₂ ceramics were systematically investigated. In addition, the grain growth kinetic mechanism of Er:SrF₂ was clarified. The results showed lattice diffusion to be the grain growth mechanism in the Er:SrF₂ transparent ceramic of which highest in-line transmittance reached 92% at 2000 nm, i.e., very close to the theoretical transmittance value of SrF₂ single crystal. Furthermore, the emission spectra showed that the strongest emission band was located at 2735 nm. This means that it is possible to achieve a laser output of approximately 2.7 μm in the 5 at. % Er ions doped SrF₂ transparent ceramics.
在本文中，我们报道了采用化学衍生粉末通过在700℃下热压40小时制备出高质量的5原子%铒离子掺杂的SrF₂透明陶瓷，这是一种用于中红外激光增益介质的潜在候选材料。对铒掺杂SrF₂陶瓷的相结构、致密化和微观结构演变进行了系统研究。此外，阐明了铒掺杂SrF₂的晶粒生长动力学机制。结果表明，晶格扩散是铒掺杂SrF₂透明陶瓷中的晶粒生长机制，其在2000nm处的最高线内透过率达到92%，即非常接近SrF₂单晶的理论透过率值。此外，发射光谱表明最强发射带位于2735nm处。这意味着在5原子%铒离子掺杂的SrF₂透明陶瓷中有可能实现约2.7μm的激光输出。
