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X. -M. Duan, T. Kimura, S. Okada, H. Oikawa, H. Matsuda, M. Kato, and H. Nakanishi
[Jpn. J. Appl. Phys., Vol.34, pp.L1161-L1163, 1995]
The second-order hyperpolarizabilities (b) of aromatic carboxylates were evaluated by the hyper Rayleigh scattering method at 1.064 mm and semiempirical molecular orbital calculation. The b values of methyl methoxybenzoate and its dimer in methanol solution were measured to be 22 and 49 x 10-30 esu, respectively, which are about 0.6 and 1.3 times that of p-nitroaniline. The calculation of b and dipole moment (m) of the methyl methoxybenzoate oligomers revealed an almost linear increase of these values with increasing number of repeating units up to trimers. Since the oligomers have a short cutoff wavelength of about 300 nm as well as large b and m, these compounds are calculated to be promising chromophores for second-order nonlinear optics.