Fig. 2
Input–output characteristics of two QD-micropillar lasers used in mutual coupling experiments. Experimental (dots) and numerical (lines) injection current dependence of output power, emission frequency and linewidth for the strong modes (SM) and weak modes (WM) of pillar P1 (panels a, c, and e) and pillar P2 (panels b, d, and f). Dashed areas indicate the operation regime for the mutual coupling experiments which require emission linewidths smaller than one gigahertz (yellow area) and can be achieved for injection currents exceeding 20 μA. The calculated intracavity photon number presented in panels a and b ranges from about 1 and 20 in the relevant current regime and was determined numerically by our theory
