Turn-on experiments are important for the characterization of the laser dynamical response. We study the turn-on of a quantum dot (QD) laser when lasing occurs at both ground (GS) and excited (ES) states. Depending on the amplitude of the current pulse, the laser may either turn-on simultaneously at both states or with a significant nanosecond-scale delay between GS and ES outputs. We address this effect to the slow passage through the GS and ES bifurcation transitions as the pump current increases. Scaling laws are determined experimentally and analytically from rate equations for either small or large pump currents.
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