介绍了利用激光二极管双端泵浦高功率1.89 μm Tm:YLF激光器, 其线宽小于0.1 nm。腔内以Brewster角插入0.05 mm YAG F-P标准具强制起偏, 获得1.89 μm的水平偏振光, 再依次加入0.05 mm和0.3 mm YAG F-P标准具稳定输出波长, 实现窄线宽激光输出。当注入泵浦功率为137 W时, 获得了输出波长为1 889.3 nm 46 W的连续输出功率, 其斜率效率为45.1%。随着泵浦功率由20 W增加到137 W, 输出波长仅漂移了0.12 nm。当激光输出功率为15 W和30 W时, 对应的光束质量分别为1.7和2.2。

A high power diode-pumped Tm:YLF laser operating at 1.89 μm with FWHM line width less than 0.1 nm is introduced. The YAG Fabry-Perot etalons of 0.05 mm is inserted to polarize at Brewster angle in laser cavity, and 1.89 μm horizontal polarized light is obtained. Two Fabry-Perot etalons with 0.05 mm and 0.3 mm YAG are inserted successively for spectral narrowing and laser stabilization. Under incident pump power of 137 W, 46 W continuous output power with 1 889.3 nm output wavelength and 45.1% slope efficiency is achieved. The laser wavelength shift of only 0.12 nm with the incident pump power from 20 W to 137 W is observed. The beam quality factors at output power of 15 W and 30 W are 1.7 and 2.2 respectively.