Abstract
AbstractDetailed experimental and theoretical investigations on coherence properties of high‐β(In,Ga)As/GaAs quantum dot‐based microcavity lasers are presented. Power dependent micro‐photoluminescence measurements on the fundamental mode of the studied micropillar cavities exhibited a smooth transition from spontaneous into stimulated emission with a strong linewidth narrowing around the onset of lasing. This is accompanied by a steep increase in the coherence time of the fundamental mode emission, as derived from first‐order field correlation measurements which revealed a gradual change in theg(1)(τ) lineshapes from Gaussian‐like to more exponential. In addition, systematic coherence time measurements on various micropillars demonstrated that devices with smaller spontaneous emission coupling factorβreveal longer coherence time of the lasing emission. All experimental results are fully verified by an enhanced microscopic theory which describes the lasing properties of quantum dot (QD) micropillars. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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