Abstract: We have carried out measurements of real and imaginary parts of second order hyperpolarizability $gamma of C60, C70, (Ph$-3$/P)$-2$/PtC60, ((C$-5$/H$-5$/)$-2$/Fe)$-2$/C60 and (C$-5$/H$-5$/)$-2$/CoC60 solutions and C60 films using the Z-scan technique with picosecond excitation at 527.5 and 1055 nm wavelengths. It was found that addition of ferrocene or cobaltocene to C60 molecule slightly influences its nonlinearity while Pt-group attachment increases total nonlinearity by an order of magnitude. Strong dependence of $gamma on wavelength and state of radiation polarization has been observed. Two-photon absorption as a dominant nonlinear process in investigated fullerenes under picosecond excitation at 527.5 nm wavelength is discussed. !30
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