中红外激光在通讯、遥感、医疗、军事等领域均有重要的应用价值和前景，是目前固体激光领域的研究热点。中红外激光技术发展的瓶颈在于激光材料。本项目针对具有应用潜力的Ho3+:CaF2透明陶瓷吸收峰不匹配现有商业激光二极管这一难题，提出在Ho3+:CaF2透明陶瓷中引入Yb3+敏化离子，旨在通过能量转移的方式提高Ho3+离子在3μm处的荧光效率。通过对热压烧结过程中Yb3+/Ho3+共掺CaF2透明陶瓷微结构控制及激光性能的系统研究，探索出高纯、超分散Yb3+/Ho3+共掺CaF2纳米粉体的可控合成方法；突破高光学质量CaF2透明陶瓷的关键制备技术，解决CaF2透明陶瓷的制备科学问题；解析Yb3+离子对Ho3+:CaF2透明陶瓷中红外光谱性能增强机制，实现高效率3μm激光输出。本项目的立项将会大力促进中红外固体激光器的发展，对我国发展具有实用价值和自主知识产权的CaF2透明陶瓷具有重要的现实意义。

Mid-infrared laser is the research focus in the field of solid-state laser at present because of its potential applications in the field of communication, remote sensing, medicine, military and so on. The bottleneck of development of mid-infrared laser technology is the laser materials. In order to solve the difficult problem that the absorption peaks of Ho3+:CaF2 transparent ceramics with great potential applications in mid-infrared lasers do not match the existing commercial laser diodes, co-doped with sensitized Yb3+ ion in Ho3+:CaF2 transparent ceramics to increase the luminescent efficiency of 3μm by the method of energy transfer. By systematically studying the control microstructure of Yb3+,Ho3+ co-doped CaF2 transparent ceramics fabricated by hot-pressed(HP) method and the laser performance of Yb3+,Ho3+ co-doped CaF2 transparent ceramics, the synthesis method of high-purity, low-agglomeration and uniform Yb3+,Ho3+ co-doped doped CaF2 nanopowders will be explored. The key technology of fabrication of high-optical quality of CaF2 transparent ceramics will be break and the scientific problems in the preparation of CaF2 transparent ceramics will be solved. This project will also analysis the enhancement mechanism of the infrared properties by analyzing the spectral properties to achieve the goal of laser output in the wavelength of 3 μm. This project will greatly promote the development of mid-infrared solid-state laser, and has important significance for the development of CaF2 transparent ceramics with practical value and independent intellectual property rights in China.