Abstract

The cubic polarizabilities, 〈γ〉, of over thirty substituted phthalocyanines have been previously measured at 1064 nm and/or at 597 nm. 〈γ〉 depends dramatically on the molecular structure and central metal atom.¹,² In this paper we report the concentration dependence of the temporal response of χ⁽³⁾_xxxx and χ⁽³⁾_xyyx of metal free tetrakis(cumylphenoxy)phthalocyanine (H₂Pc(CP)₄). Further, the nonlinear optical (NLO) response of several porphyrins, including one substituted with a long chain, carotenoid polyene are reported. For each of these materials the time and polarization dependences observed in degenerate four-wave mixing (DFWM) experiments show that optical pumping contributions enhance the NLO response.

© 1992 Optical Society of America