Copper nanoparticles were elaborated in an indium tin oxide matrix by ion implantation. The nonlinear refraction and absorption coefficients of the composite materials obtained were measured using the z-scan method with nanosecond pulses at the wavelength of . In addition to the conventional on-axis z-scan configuration, measurements were carried out in the off-axis scheme to get a better sensitivity. The mechanisms responsible for nonlinear refraction and absorption in these nanocomposite materials are discussed. By using the temporal trace of the signal in the off-axis configuration, we show the thermal lensing effect to be negligible as compared with pure electronic ones.
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