【摘要】 研究一个四能级量子点耦合到单模光学腔中的量子系统,利用系统的主方程作数值模拟计算微腔中单量子点的激光输出强度随非相干泵浦的变化关系.结果显示量子点在泵浦作用下激光的输出有一个阈值;且量子点和腔模耦合强度增强时,产生激光的阈值明显减小,输出激光的峰值却增大.当泵浦作用继续增强到一定程度,因激光能级间的相干性被过强的非相干泵浦所破坏,单量子点激光输出变为零----出现了淬灭现象.更多还原

【Abstract】 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.更多还原