Morris, D.T.Pint, C.L.Arvidson, R.S.Luttge, A.Hauge, R.H.Belyanin, A.A.Woods, G.L.Kono, J.2013-05-022013-05-022013Morris, D.T., Pint, C.L., Arvidson, R.S., et al.. "Midinfrared third-harmonic generation from macroscopically aligned ultralong single-wall carbon nanotubes." <i>Physical Review B,</i> 87, (2013) American Physical Society: 161405(R). http://dx.doi.org/10.1103/PhysRevB.87.161405.https://hdl.handle.net/1911/71090We report the observation of strong third-harmonic generation from a macroscopic array of aligned ultralong single-wall carbon nanotubes (SWCNTs)with intensemidinfrared radiation. Through power-dependent experiments, we determined the absolute value of the third-order nonlinear optical susceptibility !(3) of our SWCNT film to be 5.53 × 10−12 esu, three orders of magnitude larger than that of the fused silica reference we used. Taking account of the filling factor of 8.75% for our SWCNT film, we estimate a !(3) of 6.32 × 10−11 esu for a fully dense film. Furthermore, through polarization-dependent experiments, we extracted all the nonzero elements of the !(3) tensor, determining the magnitude of the weaker tensor elements to be #1/6 of that of the dominant !(3) zzzz component.engArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articlehttp://dx.doi.org/10.1103/PhysRevB.87.161405