从掺杂稀土离子的发光角度考虑，具有六方结构的氟磷酸锶（S-FAP）低对称体系激光材料更具有潜在优势。但由于双折射效应，通常情况下该体系材料很难实现透明。针对该问题，本项目拟采用纳米晶陶瓷制备技术实现Nd：S-FAP陶瓷的透明化。通过对该体系Nd：S-FAP纳米粉体的组成与形貌控制、纳米结构透明陶瓷微结构控制及光谱性能的系统研究，探索出高纯、低团聚、组成形貌可控纳米Nd:S-FAP粉体的合成方法；弄清Nd:S-FAP纳米结构透明陶瓷的微结构演化过程、密实化过程及晶粒生长控制机制；分析Nd离子不同格位取代时的光谱特性；建立晶粒尺寸、残余空隙与光学透过率之间的相互关联；突破Nd:S-FAP纳米结构透明陶瓷的制备科学问题；实现Nd:S-FAP陶瓷的微结构控制及制备出高质量纳米结构透明陶瓷。为探索与发展低对称体系Nd:S-FAP激光透明陶瓷，乃至其他低对称体系激光透明陶瓷的制备提供理论与实验依据。

Strontium fluorophosphate (S-FAP) with hexagonal structure have more potential in the fields of laser system considering the luminescence properties of the doped rare earth ions. However, it is usually very difficult to achieve transparency in this group of low symmetry materials due to the birefringence effect. In order to solve this problem, nanocrystalline of Nd:S-FAP is proposed to achieve transparency in Nd3+ doped S-FAP ceramics in this project. By systematically studying the composition and morphology of the Nd:S-FAP nanopowders, microstructure and the spectra properties of the obtained Nd:S-FAP nanoceramics, the synthesis method of high-purity, low-agglomeration and controllable of composition and morphology of Nd:S-FAP nanopowders will be explored. The mechanism of evolution process of microstructure and densification, as well as the mechanism of control of the grain growth of preparing nanostructured Nd:S-FAP transparent ceramics will be clarified. Besides, the spectral properties of Nd ions substituted at different lattice sites will be analyzed. The correlation between transmittance and grains size and residual pores of the Nd:S-FAP transparent ceramics will be also established. The key scientific problem of fabrication ceramics with nano-structure will be break. Finally, control of the microstructure of Nd:S-FAP transparent ceramics and preparation of high optical quality of nanostructured Nd:S-FAP transparent ceramics will be realized. This project will provide experience in theory and practice for exploring and developing Nd:S-FAP laser ceramics, as well as for other laser ceramics with low symmetry system.