We propose a new model for passive mode locking that is a set of ordinary delay differential equations. We assume a ring-cavity geometry and Lorentzian spectral filtering of the pulses but do not use small gain and loss and weak saturation approximations. By means of a continuation method, we study mode-locking solutions and their stability. We find that stable mode locking can exist even when the nonlasing state between pulses becomes unstable.
© 2004 Optical Society of America
Andrei G. Vladimirov, Dmitry Turaev, and Gregory Kozyreff, "Delay differential equations for mode-locked semiconductor lasers," Opt. Lett. 29, 1221-1223 (2004)