Abstract
A very convenient method is proposed to determine the electro-optic (EO) constants and relevant nonlinear susceptibilities. It was applied to polycarbonate films doped with 4-diethylamino-4′-nitrostilbene (DEANS). The real and imaginary parts of the third-order nonlinear susceptibility X (3) (−ω;ω, 0,0) of the film with several concentrations of DEANS were obtained between 600 and 800 nm. The magnitude of relevant X (3) is proportional to the concentration of DEANS. The mechanism of the EO effect of these samples is discussed, in terms of the restricted orientation of doped molecules.
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