Abstract
Report of near-thresholdless lasing holds out the possibility of extremely low-power operation of quantum-well lasers. For low excitation densities, emission is expected to be excitonic in nature. It is well known that excitons in perfect structures with translational invariance are extended states. The present work investigates theoretically spontaneous emission by spatially extended excitons (SEE’s) in quantum wells embedded in optical microcavities and then considers the effect of localization of excitons by defects, such as well-width fluctuations. Such spatial coherence effects in optical microcavities have hitherto not been thoroughly investigated.
© 1993 Optical Society of America
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