Abstract

We performed degenerate four-wave mixing experiments in the nanosecond time domain on C₆₀ and C₇₀ toluene solutions, using 4.5-ns pulses at 365 nm. The results obtained suggest that a thermal mechanism is responsible for the long-lived component of the third-order optical nonlinearity. Thermally induced third-order susceptibilities ${\chi }^3=2.1\times {10}^{-18}\hspace{0.5em}{\mathrm{m}}^2 {\mathrm{V}}^{-2}$ and $1.6\times {10}^{-18}\hspace{0.5em}{\mathrm{m}}^2 {\mathrm{V}}^{-2}$ were obtained for C₆₀ toluene and C₇₀ toluene, respectively. Evidence of oscillatory acoustic modes in the nonlinear medium is presented.

© 1997 Optical Society of America

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