Nondegenerate four-wave mixing is analyzed with respect to biexcitonic contributions in the third-order nonlinear susceptibility . The presence of biexcitons causes a distinct asymmetry in the frequency dependence of self-diffraction. By measurement of the dependence of the intensity of the self-diffracted signal on detuning between the two incident laser beams, the biexciton binding energy is determined to be for cadmium sulfur quantum dots of embedded in glass. Thus, even for weakly confined II–VI quantum dots with , a confinement-induced enhancement of was found.
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