单斜结构的Yb：KLu(WO4)2晶体光谱和激光性质的各向异性

Anisotropy in spectroscopic and laser properties of monoclinic Yb:KLu(WO_4)_2 crystal

研究了Yb:KLu(WO4)2晶体对非偏振抽运光的吸收以及连续波激光振荡性质.晶体结构的低对称性导致晶体光谱呈强烈各向异性,最强的吸收和发射都发生在平行于Nm主轴的偏振方向上.Ng切向晶体具有最高的非偏振抽运光吸收效率和最大的激光功率产生潜力,2mm长的晶体产生的最高连续波输出功率为11W,相对于吸收抽运功率,光—光转换效率为68%,而斜率效率则达80%.

We conducted an investigation into the polarized absorption and emission spectra,the absorption for unpolarized pump light,and the continuous-wave（cw） laser properties of the Yb：KLu（WO4）2 crystal.The low symmetry of the crystal leads to strong anisotropy in the crystal spectroscopy,the strongest absorption and emission occur in the polarization direction parallel to the N_m principal axis.The N_g-cut crystal has highest absorption efficiency for unpolarized pump light and largest potential for generating laser output power.With 11 W of cw output power produced by using a 2 mm thick crystal,the optical-to-optical conversion and slope efficiencies amount to 68% and 80%,respectively,with respect to the absorbed pump power.