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用金属有机物热分解法（MOD法）制备了含镧PLT薄膜，用Z－scan技术测试其非线性光学性能.结果表明：低镧（≤25％，摩尔百分数）的PLT薄膜下显示非线性光学效应；高镧的PLT薄膜非线性光学效应较强．PLT30薄膜的非线性折射率高达0．3μesu（静电单位）．
The lanthanum-containing PLT thin films were prepared by thermal decomposition of metal organic compounds (MOD) and their nonlinear optical properties were tested by Z-scan technique.The results show that PLT films with low lanthanum (≤25%, mole%) show nonlinear optics Effect; high lanthanum PLT film nonlinear optical effect is strong. The nonlinear refractive index of PLT30 film is as high as 0.3 μesu (electrostatic units).