DFWM measurements of third-order susceptibility of single-wall carbon nanotubes grown without catalyst

Non-linear optical response of single-wall carbon nanotubes, produced without catalyst, was investigated. Third-order susceptibility Degenerate Four Wave Mixing measurements have been performed on thick film of nanotubes deposited onto quartz substrate. Results are presented as measured in the nanosecond time scale at 532 nm. The second-order hyperpolarizability γ was estimated to be as large as 1.6 × 10−29 e.s.u.