study of the quantum efficiency of semiconductor quantum dot pulsed micro-laser

The interaction of the cavity electromagnetic field with the two-level emitter is described by cavity quantum electrodynamics (cqed). a pulsed micro-laser is an array of semiconductor quantum dots (qds) embedded in an optical micro-cavity. this is one of the basic tools of quantum information technology. in this study, the energy eigenvalues variations and the quantum efficiency of a micro-laser system includes a qd with a decay rate of 0.8μev embedded in the different micro-cavities, were investigated. the results show that with the increasing coherent interaction rate of micro-laser system, the energy eigenvalues variations of this optical system also increase. the quantum efficiency for this nano-optical system was studied. the results show the smaller micro-cavity decay rate, the higher quantum efficiency at smaller coherent interaction rate. then, the optimal value of the micro-cavity decay rate was obtained in order to achieve the maximum quantum efficiency. the calculation results showed that the highest quantum efficiency occurs for optical parameters γa=0.8μev, g=95μev, γc=177.7μev, and ηmax=0.991.