Fig. 7
Cross-correlation coefficient of synchronized micropillar lasers. The plot shows the delay-dependent cross-correlation coefficient ρ(τ = t2′−t1′) of mutually coupled micropillar lasers with an additional mirror relay. In the delay range [−10 ns, 10 ns] the sum (bright yellow curve) of five peaks of the form A exp (−|τ−τcenter|/τcorr) are fitted to the data (black). The zero-lag peak is depicted in blue, the leader-laggard peaks where pillar 1′ or pillar 2′ is leading are depicted in red and green, respectively
