The Study of a Single Quantum Dot Laser's Particular Output Property in Microcavity

The quantum system under investigation is a four-level QD(quantum dot)coupled a single mode of an optical microcavity.By the numerical calculation method of the quantum-optical master equations the intensity of a single QD laser's evolution with the variation of the incoherent pumping rate was investigated.The results display that there is a threshold for Laser's output under the action of the incoherent pumping.The stronger of the coupling strength between the QD and mode,the smaller of threshold,and the larger peak value of Laser's output.At the sufficiently high pump rates the lasing turns off to zero,because the coherence between the laser levels is destroyed.Self-quenching behavior appears.