We present investigations on the coherence of the emission from the fundamental mode of an AlGaInAs/GaAs quantum-dot microcavity laser. We measure the first-order field-correlation function $g^{(1)}(\tau )$ with a Michelson interferometer, from which we determine coherence times of up to $20\mathrm{ns}$ for the highest pump powers. To fully characterize the coherence properties of the cavity emission, we apply a phenomenological model that connects the first- and second-order correlation functions. Hereby it is possible to overcome the limited sensitivity of the streak camera used for photon-correlation measurements, and thus to extend the accessible excitation-power range for $g^{(2)}(\tau )$ down to the thermal regime.

© 2011 Optical Society of America

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