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X. -M. Duan, S. Okada, H. Oikawa, H. Matsuda, and H. Nakanishi
[Mol. Cryst. Liq. Cryst., Vol.267, pp.89-94, 1995]
The second-order hyperpolarizabilities (b) of two categories of organic ionic species were evaluated by the hyper Rayleigh scattering method. The |b| of (dimethylamino)stilbazolium analogues in methanol with long cut-off wavelength more than 600 nm, which can be used for electro-optic modulation, were evaluated to be in the order of 10-27 esu using 1064 nm light as a fundamental beam. Aromatic sulfonates in the second category were found to have comparatively large |b| values irrespective of short cut-off wavelength: In the case of sodium p-toluenesulfonate with cut-off of 280 nm, |b| in methanol was 2.2 x 10-29 esu and was about two thirds of p-nitroaniline with cut-off of 445 nm.