利用激光二极管(LD)直接抽运稀土离子或过渡金属离子的方式产生中红外激光可以大幅度降低系统的复杂程度，提高效率。而找到合适的基质材料和离子能级结构是实现LD 直接抽运产生中红外激光的关键。总结了相关研究进展和发展方向，主要包括高功率、高效率、激光二极管直接抽运的过渡金属离子掺杂II-VI 族材料激光器和稀土离子掺杂晶体、玻璃、光纤、陶瓷等材料的固态激光器，这些激光器的输出涵盖了2~5 μm 波段，具有结构简单、成本低等优点。其中过渡金属离子掺杂II-VI 族化合物，如Cr:ZnSe/ZnS，具有吸收和发射截面大、室温量子效率高、激发态吸收小等优点；而稀土离子掺杂材料，如Er3+/Tm3+/Ho3+:玻璃，具有能级丰富，可多波长抽运获得多波长发光等优点。通过对稀土离子在不同基质材料中晶格场结构能级调控有望实现波长可控的中红外激光输出。

Directly pumping rare-earth ions or transition metal ions doped laser materials can greatly reduce the complexity of laser system and improve the efficiency. Searching a suitable substrate material and ion energy level structure is key factor to realize the mid- infrared laser directly pumped by laser- diode (LD). Recently research progresses in mid- infrared solid- state laser of laboratory are introduced. This paper includes experimental research on the high power, high efficiency, LD direct pumping transition- metal ions doped II- VI materials laser and rare-earth ions doped crystals, glasses, fibers, and ceramics laser. Those lasers are featuring simple structure and low cost and covering 2~5 μm range wavelength. Cr2+-doped ZnSe and ZnS, featuring large absorption and emission cross-section, high quantum efficiency at room temperature and very low excited state absorption, are the most popular candiadate. Er3 +/Tm3 +/Ho3 +-doped glasses possess rich energy level to emission multi-wavelength. By controlling the structure of rare-earth ions lattice field in different materials, it can realize tunable mid-infrared laser output.