Nonlinear optical response of water soluble C70 dendrimers

The nonlinear optical (NLO) response of some water soluble C70 dendrimers was studied under nanosecond and picosecond laser excitation in the visible (at 532 nm) and is compared with the response of pristine C70 dissolved in toluene. The NLO response of the dendrimers was found to be about seven times smaller than that of C70 under ns excitation, while no response was found under ps excitation. The second hyperpolarizability γ of both the C70 dendrimers and pristine C70 were determined and compared with other published results.