Résumé
Monte Carlo markovian models of a dual-mode semiconductor laser with quantum well (QW) or quantum dot(QD) active regions are proposed. Accounting for carriers and photons as particles that may exchange energy inthe course of time allows an ab initio description of laser dynamics such as the mode competition and intrinsiclaser noise. We used these models to evaluate the stability of the dual-mode regime when laser characteristicsare varied: mode gains and losses, non-radiative recombination rates, intraband relaxation time, capture time inQD, transfer of excitation between QD via the wetting layer. . . As a major result, a possible steady-sate dual-mode regime is predicted for specially designed QD semiconductor lasers thereby acting as a CW microwave orterahertz-beating source whereas it does not occur for QW lasers.