NONLINEAR-OPTICAL PROPERTIES OF CDSE QUANTUM DOTS

The nonlinear optical properties of CdSe quantum dots are investigated using self-saturation and degenerate four-wave mixing techniques. The saturation of the room temperature absorption coefficient, for a wave length in the vicinity of the first exciton peak, is measured. The mea sured data can be predicted from a description of the quantum dot as a two level, homogeneously broadened, saturating system. The variation of the four-wave mixing reflectivity with intensity and with wavelengt h is reported. All four-wave mixing data are also consistent with the homogeneously-broadened two-level model.