Abstract
The progress of laser technology during the past twenty years made it possible to extend the time resolution of optical experiments down to picosecond and femtosecond time scales. In this paper, the state-of-the-art techniques of ultrafast optical spectroscopy are reviewed. It is shown, how these can be used to monitor directly dynamics of elementary excitations in semiconductor nanocrystals and how, in turn, understanding ultrafast carrier processes makes it possible to tailor the properties of these structures for application in photonics, nanoelectronics and spintronics.
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