Abstract
Third‐order nonlinear optical responses in single walled carbon nanotubes have been investigated by means of pump‐probe spectroscopy with various excitation conditions. In the excitation spectra of nonlinear susceptibilities probed at the E22 transition energy of the (8, 4) tube, an additional peak is observed at ∼0.2 eV above the E22 transition energy. It is found that the phonon‐assisted transition is involved in the third‐order nonlinear optical processes.
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