报道了一种室温下高效率运行的激光二极管(LD)端面抽运Tm∶YAP连续波激光器。抽运源使用波长为795 nm的光纤耦合二极管激光器, Tm∶YAP晶体c轴切割, 掺杂原子数分数为3%, 尺寸为3 mm×3 mm×7 mm。当输出镜透过率T为10% 时, 获得8.12 W的1.94 μm连续波激光输出, 相对应的抽运功率为26.2 W, 阈值抽运功率为4.67 W, 斜率效率为52.1%, 光-光转换效率为31.0%。使用光栅单色仪测得激光器输出中心波长为1938. 2 nm, 谱线半峰全宽约为 2.9 nm。

High efficient continuous wave Tm∶YAP laser end-pumped by laser-diode (LD) is presented in this paper. In experiment, fiber-coupled LD at 795 nm is used to pump the Tm∶YAP crystal. The c-cut Tm∶YAP crystal with the dimensions of 3 mm×3 mm×7 mm is doped with the 3% Tm3+ (atomic fraction). Under the input pump power of 26.2 W, the highest output power reaches 8.12 W with 10% transmittance, and the laser threshold is 4.67 W, corresponding to slope efficiency of 52.1% and the optical conversion efficiency of 31.0%. The free running laser spectrum of Tm∶YAP is measured by using a grating monochromator, and the corresponding central wavelength is 1938.2 nm, with full width at half maximum of 2.9 nm.