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Comparatively Large Second-Order Hyper-polarizability of Aromatic Sulfonate Anion with Short Cutoff Wavelength

X. -M. Duan, S. Okada, H. Oikawa, H. Matsuda, and H. Nakanishi
[Jpn. J. Appl. Phys., Vol.33, pp.L1559-L1561, 1995]

The second-order hyperpolarizabilities (b) of ionic species of sodium p-toluenesulfonate (pTSNa) and its corresponding neutral derivative methyl p-toluenesulfonate (pTSMe) in methanol were evaluated to be 2.2 x 10-29 and 1.2 x 10-29 esu, respectively, using the hyper Rayleigh scattering method at 1064 nm. Since ionic pTSNa has short cutoff wavelength of 280 nm as well as comparatively large |b| value, i.e., about twice that of neutral pTSMe and about two-thirds that of p-nitroaniline, aromatic sulfonate ions are concluded to be worth investigating as potential chromophores for second-order nonlinear optics.

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