利用连续激光z扫描技术研究了两种新型金属有机配合物非线性材料在457nm、488nm和514nm三个激发波长下的热光效应。结合实验曲线和理论公式计算了这两种配合物溶液的热光系数dn/dT和热致非线性折射率n2的值。通过对比研究发现, 材料的热致三阶非线性光学性质依赖于材料的分子结构和激发波长, Cu配合物的热光系数和热致非线性折射率的数值较大, 且受激发波长的变化影响很小, 而Pd配合物的热致非线性随激发波长的增大而减小, 这主要是由两种化合物分子结构的差异导致其吸收光谱分布不同决定的。

Thermo-optical effects of two types of complexes are investigated using constant laser z-scan technique under 457nm, 488nm and 514nm excitation. Thermo-optical coefficients dn/dT and thermo-induced nonlinear refractive indexes n2 values are calculated by combination of experimental curves and theoretical formula. By comparing the results, it is found that the thermo-induced nonlinear optical properties are dependent on the molecular structures and excitation wavelength. The thermo-optical coefficient and thermo-induced nonlinear refractive index value of Cu complexes are higher, and are insensitive to the excitation wavelength. The thermo-induced nonlinear optical values of Pd complexes are decreased with the increase of the excitation wavelength. It is decided by the absorption spectra difference induced by the molecular structure.