我们生长了掺镁量分别为3.0mol%、5.0mol%、7.8mol%、9.0mol%的76mm高掺镁铌酸锂晶体,检测了这些晶体的生长条纹情况,并利用双光耦合配置测试了这些晶体在351nm紫外光下的光折变性能。从实验结果看,采用同成分共熔点铌锂配比的高掺镁铌酸锂晶体生长条纹比较多;虽然高掺镁铌酸锂晶体在可见光波段有很好的抗光折变能力,但是在紫外光下具有良好的光折变性能,可以作为优良的紫外光折变材料使用。同时,实验结果表明,掺镁量在5.0mol%的铌酸锂晶体具有最佳的紫外光折变性能。 We have grown 76mm highly doped magnesium lithium niobate crystals with 3.0, 5.0, 7.8 and 9.0 mol% Mg respectively. The growth stripes of these crystals were examined and tested using a two-optical coupling configuration Photorefractive properties of these crystals at 351 nm UV light. From the experimental results, using the same composition of eutectic point of lithium niobate ratio of high growth of magnesium lithium niobate crystal growth stripes are more; high Mg-doped lithium niobate crystal in the visible band has a good resistance to photorefractive ability, but at Under UV light has good photorefractive properties, can be used as excellent UV light conversion materials. At the same time, the experimental results show that lithium niobate with 5.0mol% Mg content has the best UV-to-UV transition properties.