Molecular structure, vibrational features and nonlinear optical properties of the dye Bis [4-(Dimethylamino) phenyl] Methaniminium Chloride have been studied. The detailed structural and optical properties were studied by spectroscopic techniques such as FT-IR, FT-Raman, UV-visible combined with theoretical DFT method. Using the Z-scan technique, third-order nonlinear properties like nonlinear absorption, nonlinear refraction, third-order susceptibility and second-order hyperpolarizability were measured experimentally in different solvents with different concentrations and intensities, confirms the third-order response. The optical limiting property of the dye was also studied. The overall results confirms the titled dye can be a suitable material for nonlinear optical applications.

研究了染料双[4-（二甲氨基）苯基]氯化亚甲基铵的分子结构，振动特征和非线性光学性质。通过光谱技术，如FT-IR，FT-Raman，UV-可见光结合理论DFT方法研究了详细的结构和光学性质。使用Z扫描技术，在不同浓度和强度的不同溶剂中，通过实验测量了三阶非线性特性，如非线性吸收，非线性折射，三阶磁化率和二阶超极化率，证实了三阶响应。还研究了染料的光学极限性质。总体结果证实了该标题染料可以是用于非线性光学应用的合适材料。