We show both theoretically and experimentally by degenerate four-wave mixing that the combined processes of optical rectification and the linear electro-optic effect contribute to the large effective third-order susceptibilities [14χ⁽³⁾(CS₂)] of the organic salt 4-N, Nˆ- dimethylamino-4^′ -N^′ -methylstilbazolium toluene-p- sulfonate (DAST). Furthermore, the knowledge of the cascaded contributions was used to determine absolute values of the third-order susceptibilities as well as their sign.

© 1999 Optical Society of America

[Optical Society of America ]

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