LD双端同向偏振泵浦Tm∶YLF激光器

LD double ended co-polarization pumped Tm∶YLF laser

基于同向偏振泵浦技术,实现了LD双端同向偏振泵浦Tm∶YLF激光器的1.9μm高效输出。在激光器实际运行状态下,对晶体内温度分布进行了模拟仿真并开展实验研究。实验采用偏振分束器和半波片,使两束不同方向的泵浦光转换为同向偏光振注入晶体。晶体掺杂浓度为3%.at,尺寸为3 mm×3 mm×14 mm。激光器采用长度为80 mm的“L”形平凹腔。输出镜透过率T=15%,曲率半径R=150。当泵浦功率为47.42 W时实现了14.72 W的功率输出。波长为1907.6 nm,线宽为1.26 nm。光束质量为M^(2)_(x)=3.19和M^(2)_(y)=3.29,斜效率为37.24%,光-光转化效率为31%。

Based on the co-polarization pumping technology,the 1.9μm high-efficiency output of LD double ended co-polarization pumped Tm∶YLF laser is realized.The temperature distribution of Tm∶YLF crystal pumped by LD double end co-polarization was simulated and experimentally studied.The experiment used a split beam splitter to convert the pump light into the homogeneous polarization injection and built an L-shaped plano-concave cavity laser by 80 mm length.The crystal doping concentration was 3 at.%and the size were 3 mm×3 mm×14 mm,the transmittance of the output mirror is 15%.The power output achieved 14.72 W when the pump power is 47.42 W.At this time,the wavelength of the beam is 1907.6 nm,the linewidth is 1.26 nm,the mass is M^(2)_(x)=3.19 and M^(2)_(y)=3.29,the slope efficiency is 37.24%,and the light-to-light conversion efficiency is 31%.