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We study the dynamics of multimode semiconductor lasers with optical feedback. Our model takes into account explicitly spatial effects, which are included by considering spatial profiles for N longitudinal modes coupled to the space-dependent gain. We also consider the effect of carrier diffusion. We find that in the weak feedback regime the longitudinal modes display antiphase oscillations that lead to a nearly constant output intensity. This result is largely independent of the value of thedoi:10.1103/physreva.71.013818 fatcat:4jnfgfvqvbaydf5a7ghiwarmxq