Abstract
Third-order optical nonlinearities in C60– and C70–toluene solutions were studied by using a time-delayed degenerate four-wave-mixing technique with 30-ps pulses at 0.532 μm in both parallel- and cross-polarization configurations. The concentration dependences of were measured for C60– and C70–toluene solutions. In order to explain the strange concentration dependence of in the C70 –toluene solution, the sign of the contribution from the C70 molecules was assumed to be opposite the sign of that from toluene.
© 1992 Optical Society of America
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