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23 September 1994 Third-order hyperpolarizabilities of soluble organometallic compounds
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The molecular hyperpolarizabilities (gamma) of several soluble organometallic compounds have been determined by third-harmonic generation in solution at 1.064 and 1.907 micrometers fundamental wavelengths. Both, the real and imaginary parts of (gamma) have been determined from the concentration dependence of the harmonic intensity. Values between 10-33 and 10-32 esu have been found, depending on excitation wavelength and metal substitution. Results have been discussed with reference to those recently measured by us for metal-free (H2Pc) and copper (CuPc) phthalocyanines. Quantitative analysis have been carried out, based on four-level model expressions for the dispersion of (gamma) . Experimental values have been described in terms of two excited one-photon allowed levels (corresponding to transitions associated with bands observed in the linear optical spectrum at around 0.3 and 0.9 micrometers ) and a one-photon forbidden (two photon allowed) level placed between both transitions.
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Maria Angeles Diaz-Garcia, Fernando Agullo-Lopez, M. G. Hutchings, P. F. Gordon, and Francois Kajzar "Third-order hyperpolarizabilities of soluble organometallic compounds", Proc. SPIE 2285, Nonlinear Optical Properties of Organic Materials VII, (23 September 1994);

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