The nonlinear (NL) response of lead-germanium oxide amorphous films was investigated using a Ti:saphire laser delivering pulses of ≈150fs at 800nm. The Kerr shutter technique was employed to reveal the time response of the nonlinearity that is smaller than 150fs. The sign and magnitude of the nonlinearity were obtained using a novel technique called thermally managed eclipse Z scan which allows the simultaneous characterization of cumulative and noncumulative NL effects. The NL refractive index of electronic origin, n2≈2×10−17m2∕W, and the NL absorption coefficient, α2≈3×103cm∕GW, were determined.
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Rátiva et al. (2007) studied this question.
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