钆镱共掺杂铝酸钇晶体的生长及性能研究

Growth and Properties of Gd^(3+)/Yb^(3+) Co-Doped Yttrium Aluminate Crystals

采用单晶提拉法成功生长出优质的Gd^(3+)/Yb^(3+)共掺铝酸钇晶体。对晶体的结构、分凝系数、光谱和激光性能进行了表征,结果表明:所生长的晶体空间群为Pnma,属于正交晶系,Yb^(3+)的分凝系数为1.13。从偏振吸收和荧光光谱发现,b偏振方向时,晶体在980 nm处吸收截面为2.14×10^(-20) cm^(2),适用于InGaAs激光二极管泵浦;在1044 nm处的发射截面为0.39×10^(-20) cm^(2),荧光寿命为1.638 ms。此外,对b切向的Gd/Yb∶YAP晶体进行激光实验,在1μm处实现连续激光输出,斜率效率为23.5%,最大输出功率可达0.51 W。

High-quality Gd^(3+)/Yb^(3+) co-doped yttrium aluminate crystal was successfully grown by the Czochralski method.The crystal structure,segregation coefficient,spectrum and laser performance were characterized.The results show that the grown crystal space group is Pnma,which belongs to the orthorhombic system,and the segregation coefficient of Yb^(3+) is 1.13.According to the polarization absorption and fluorescence spectra,it is found that the absorption cross section of the crystal at 980 nm is 2.14×10^(-20) cm^(2) in the b polarization direction,which is suitable for InGaAs laser diode pumping.At the same time,the emission cross section at 1044 nm is 0.39×10^(-20) cm^(2) and the fluorescence lifetime is 1.638 ms.In addition,a laser experiment was performed on the Gd/Yb∶YAP crystal in the b tangential direction,and the continuous laser output achieves at 1μm,the slope efficiency is 23.5%,and the maximum output power reaches 0.51 W.