Abstract
The third order optical non-linearities χ (3) of some excited diphenyl-polyene derivatives (t-stilbene, 1,4 diphenyl-butadiene, 1,6 diphenyl-hexatriene, 1,8 diphenyl-octatetraene) have been studied using Degenerate Four Wave Mixing (DFWM) and Optical Kerr Effect (OKE) on a sub-picosecond time-scale. Strong enhancements of χ (3) between ground and excited states are observed for some compounds and discussed taking into account the symmetry of excited states and resonance conditions. The dynamics of χ (3) has been measured and may show fast or slow regimes, depending on the compound. The spectral dependence of the real and imaginary part of the optical non-linearity have been measured.
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