2～5μm中红外固体激光在民用和军事领域具有广阔的应用前景。发展这类新型激光器的关键之一是研发在中红外波段能够实现高效发射、物化性能稳定、同时成本低廉的基体材料。本项目拟采用热分解法制备前期的ZnS(ZnSe)：Cr2+纳米晶颗粒，然后采用熔融-急冷法，获得在硫系玻璃和光纤基体中镶嵌尺寸和空间分布均匀的ZnS(ZnSe)：Cr2+纳米晶；采用扫描电镜，高分辨透射电镜，拉曼光谱以及荧光光谱等技术，研究复合材料中纳米晶的掺杂浓度，尺寸和分布对中红外发光特性（如发光强度、荧光寿命和量子效率等）的影响；重点研究高纯度的纳米晶和低损耗光纤的制备工艺，进而通过降低复合材料中杂质含量，优化发光性能；综合评价材料的制备技术、显微结构和发光性能的关联，为进一步研发中红外可调谐激光新材料提供实验和理论依据。

2-5μm solid state mid-infrared lasers have the broad application in the military and civil area. One of the keys to the development of the laser is to attain new base materials possessing the high efficiency mid-infrared emission, stability physical properties and low-cost. In this project, ZnS(ZnSe)：Cr2+ nanocrystals are firstly prepared by thermal decomposition technique, then chalcogenide glass and fiber containing a uniform distribution ZnS(ZnSe)：Cr2+ nanocrystals are prepared by melt-quenching technique. According to the Scanning electron micrograph (SEM), High resolution transmission electron microscopy (HRTEM), Raman spectra and luminescence spectra, we investigate the influences of the doping concentration, sizes and distribution of nanocrystals on the mid-infrared emission, such as luminous intensity, fluorescence lifetime, quantum efficiency and so on; the investigation mainly focus on the preparation technology of high purity nanocrystals and low loss fibers, reduces the impurity content of nano-composite material, and then enhances the optical property; the correlation of preparation technology, microstructure and optical performance are synthetically evaluated, and furthermore to provide an experimental and theoretical basis for the development of the tunable mid-infrared laser materials.