Abstract

We investigate the optical Kerr nonlinearity and multiphoton absorption (MPA) properties of 4-N, N-dimethylamino-4’-N’-methyl-stilbazolium 2, 4, 6-trimethylbenzene-sulfonate (DSTMS) excited by femtosecond pulses at a wavelength of 1.43 µm, which is optimal for terahertz generation via difference frequency mixing. The MPA and the optical Kerr coefficients of DSTMS at 1.43 µm are strongly anisotropic, indicating a dominating contribution from cascaded second-order nonlinearity.

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