Relaxation oscillations in a semiconductor quantum-dot laser

We study relaxation oscillations in a semiconductor quantum-dot laser using the electron-hole asymmetry model [M. Abusaa et al., Phys. Rev. A 87, 063827 (2013)]. Two relaxation oscillations are found at simultaneous lasing in the ground and excited states in a wide range of quantum-dot laser parameters. One of these two relaxation oscillations is close to in-phase oscillation and the other may be antiphase oscillation at certain parameters.