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<sup>(3)</sup>(CS<sub>2</sub>)] of the organic salt 4-<i>N</i>, <i>Nˆ</i>- dimethylamino-4<sup>′</sup> -<i>N</i><sup>′</sup> -methylstilbazolium toluene-<i>p</i>- 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
Ch. Bosshard, I. Biaggio, St. Fischer, S. Follonier, and P. Günter, "Cascaded contributions to degenerate four-wave mixing in an acentric organic crystal," Opt. Lett. 24, 196-198 (1999)