Abstract

The influence of solvent polarity on nonlinear optical properties of tris-(8-hydroxyquinoline)-aluminum (${\mathrm{Alq}}_3$) was investigated by the degenerate four-wave mixing method at the 532 nm. It was obtained that the effective values of the third-order nonlinear optical susceptibility (${\chi }_{\text{eff}}^{⟨3⟩}$) and the second-order hyperpolarizability (${\gamma }_{\text{eff}}$) of ${\mathrm{Alq}}_3$ depend on the solvent polarity. Additionally, it was found that ${\mathrm{Alq}}_3$ dissolved in dimethyl sulfoxide has the highest values of ${\chi }_{\text{eff}}^{⟨3⟩}$ and ${\gamma }_{\text{eff}}$. Furthermore, two Stegeman’s figures of merit were also calculated. The obtained results suggest that ${\mathrm{Alq}}_3$ is also promising material for application in all-optical signal processing devices.

© 2017 Optical Society of America

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