We report measurements of the nonlinear (NL) refractive index n2 of lead-germanium films (LGFs) containing Cu and Cu2O nanoparticles (NPs). The thermally managed eclipse Z-scan technique with 150fs pulses from a laser operating at 800nm was used. The NL refractive index measured, n2=6.3×10−12cm2∕W has electronic origin and the NL absorption coefficient α2 is smaller than 660cm∕GW. The figure of merit n2∕λα2 is enhanced by more than two orders of magnitude in comparison with the result for the LGFs without the copper based NPs.

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