8 December 1995 Nonlinear optical properties of a C70 film between 740 and 880 nm
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We use time resolved degenerate four-wave-mixing with femtosecond pulses to measure magnitude, phase, and dispersion of all nonzero components of the third order nonlinear optical susceptibility tensor (chi) (3)(-(omega) ; (omega) , (omega) , -(omega) ) of a polycrystalline C70 film. Rise and fall times of the nonlinearities measured are short compared to the (112 plus or minus 5 fs) pulses employed. Accordingly, the cw symmetry relation (chi 1111) equals 2 (chi 1212) plus (chi 1221) is experimentally found to be satisfied. The magnitude of (chi 1221) is measured to be (5.04 plus or minus 0.19) 10-13 esu relative to fused silica independent of wavelength. The ratio (chi 1212)/(chi 1221) is wavelength dependent and varies between 1.87 plus or minus 0.12 and 1.44 plus or minus 0.09. The magnitudes of phase angles for (chi 1111) and (chi 1212) are (120 plus or minus 22) degree(s) and (105 plus or minus 21) degree(s), respectively. The intensity dependence of the observed signals is cubic for intensities up to 20 GW/cm2 at all wavelengths. Good agreement between data derived from degenerate four-wave-mixing and third-harmonic generation in C70 as well as in C60 films is found.
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Friedrich P. Strohkendl, Friedrich P. Strohkendl, R. J. Larsen, R. J. Larsen, Theresa J. Axenson, Theresa J. Axenson, Larry Raymond Dalton, Larry Raymond Dalton, Robert W. Hellwarth, Robert W. Hellwarth, H. W. Sarkas, H. W. Sarkas, Zakya H. Kafafi, Zakya H. Kafafi, "Nonlinear optical properties of a C70 film between 740 and 880 nm", Proc. SPIE 2530, Fullerenes and Photonics II, (8 December 1995); doi: 10.1117/12.228116; https://doi.org/10.1117/12.228116

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