4.3μm波段中红外激光在大气遥感、环境监测、生物医学及光电对抗诸多领域有重要的应用需求。但目前能够直接泵浦的4.3μm波段固体激光器，不论功率输出还是技术上都远落后于3μm以下波段的固体激光器。本项目以Dy3+掺杂氟化物晶体为研究对象，深入研究Dy3+:PbF2晶体4.3μm激光输出特性，通过1.7μm高亮度拉曼光纤泵浦吸收上转换和3.4μm级联振荡等能级调控手段，有效地抽空激光下能级粒子，抑制激光振荡自终止现象,深入研究能级调控以及掺敏化离子提高吸收效率降低热效应等基本科学问题，实现高功率连续波Dy3+:PbF2 4.3μm激光输出，探索4.3μm波段调Q短脉冲激光运转的可行性，为推进直接泵浦稀土离子4.3μm波段中红外固体激光器走向实用化探索新的技术路线。

The coherent sources with 4.3μm band range have potential applications in many fields, such as atmospheric remote sensing, environmental monitoring, biomedicine, opto-electronic countermeasures, and numerous military. However, the current direct pumping of 4.3μm band solid-state lasers with both power output and technology are far behind the 3μm below the band of solid-state lasers. In this project, based on Dy3+ ion doped fluoride crystal Dy3+:PbF2, we well demonstrated the 4.3μm mid-IR lasing characteristics from theoretical and experimental research. By means of energy level regulation such as 1.7μm pump absorption up-conversion and cascade oscillation, the lower level particles of laser can be effectively pumped out to suppress the self-termination of laser oscillation. In-depth study level regulation and mixed sensitizing basic scientific problems such as ion absorption efficiency reduce the heating effect, achieving high power continuous wave Dy3+:PbF2 4.3μm laser output, explore 4.3μm band Q -switched short pulse operation, to promote direct pump of rare earth ions 4.3μm band laser to the practical exploration of new technology.