Abstract
We report an experimental investigation of third-order optical nonlinearities of Ge nanocrystals (NC)'s embedded in silica matrix using femtosecond laser pulses at 780-nm wavelength. Both the nonlinear absorption and nonlinear refraction index of the Ge NC's have been measured using the Z-scan method and the dynamics of the absorptive nonlinearity has been investigated with the pump-probe technique. The mechanisms responsible for the observed nonlinear response are also discussed.
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