A 2 μm laser has important applications and prospects in various fields such as LIDAR, material processing, environmental monitoring, and space communication, as well as fundamental researches. Being designed for the room-temperature operation, our Tm:YLF laser with L flat concave resonator incorporates a laser-diode end-pump setup, in which a volume Bragg grating and double Fabry–Pérot etalons serve as a line-width limiting element. With an injection power of 49.58 W, a maximum output power of 17.78 W is achieved with a center wavelength of 1908.55 nm and a linewidth limited from 2 to 0.1 nm. A corresponding slope efficiency of 42.89% and an optical–optical conversion efficiency of 35.86% are obtained.

2μm激光器在激光雷达，材料加工，环境监测和空间通信以及基础研究等各个领域具有重要的应用和前景。我们的Tm：YLF激光器具有L型平凹谐振腔，专为室温操作而设计，集成了激光二极管端泵装置，其中体积布拉格光栅和双重Fabry–Pérot等温线用作线宽限制元件。注入功率为49.58 W，中心波长为1908.55 nm，线宽限制为2至0.1 nm，可实现最大输出功率17.78W。相应的斜率效率为42.89％，光-光转换效率为35.86％。