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Study on the relationship of third-order optical non-linearity with molecular structure in aromatic organism

The third-order nonlinear optical susceptibility χ(3), nonlinear refractive index n2 and time response for for aromatic organism (naphthalene C10H8, anthracene C14H10, dibenzathracene C22H14 and dibenzopentracene C30H18) were measured with forward DFWM. The absorption spectra, excitation spectra and fluorescence spectra for them were given. The induced mechanism of the nonlinear effects, affecting factors and relation with the molecular structure were discussed.