Zn∶LiTaO_3的结构及其光学性能的研究

Growth and optical properties of lithium tantalum doped with zinc

本文采用提拉法生长Zn(3(mol)%,5(mol)%,7(mol)%)∶LiTaO3晶体。通过Zn∶LiTaO3晶体的紫外-吸收光谱和红外光谱测试结果来推测Zn2+对晶体结构的影响。ZnO掺杂3(mol)%,5(mol)%时,Zn2+取代反位钽的位置,从而使晶体中的光电导下降,晶体的抗光损伤性能得到改善。当ZnO掺杂达到7(mol)%时,Zn2+将晶体中的所有反位钽取代,并开始取代正常晶格的Li位,因此,晶体的抗光折变性能比纯的钽酸锂晶体提高了两个数量级。

Doping ZnO in LiTaO3 in 3（mol）%, 5（mol）%, 7（mol）%. ZnO：LiTaO3 were grown by the Czochraski method , We tested the absorption spctrum and studied the change mechanism of the UV-V absorption edge. When the ZnO concentration reached 3（mol）% and 5（mol ）% concentration, Zn^2＋ ions took all priority of replacing anti-site Ta （Ta^4＋Li）.In contrast, so its diffraction efficiency and erasure time decreased, its light scattering resistance im- proved, when the ZnO concentration reached 7（mol）%, all of the ions were completely replaced, and Zn^2＋ ions began to occupy the normal. Its light scattering resistance of samples increased significantly. It＇s two orders of magnitude higher than that of pure LiTaO3 crystals.