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Quantum dot (QD) lasers, with record low- threshold currents, have now been realized in several laboratories.1 Carriers in such lasers are electrically pumped into barriers around the dots. Thereafter, they are captured into the dots and relax via the QD energy levels to the lower lying lasing levels. The mechanisms for injecting electrons and holes into the QD and the time scale on which these processes occur are not fully known. These will however to a large extent determine the dynamical properties of lasers and other QD based devices.
© 2001 Optical Society of America
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