Abstract

We investigate the dephasing times in highly excited CdSe and CdS0.3Se0.7 nanocrystals by spectral hole burning throughout the gain region. The energy dependence of the dephasing time T2 is compared between quantum dots in the strong-confinement regime and bulklike microcrystals. T2 in strongly confined quantum dots remains rather constant, whereas the bulklike sample shows a continuous increase of T2 toward the transparency point. This observation is attributed to the different gain mechanisms in the strong and the weak quantum-confinement regimes.

© 1996 Optical Society of America

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