We use an effective-index self-consistent dynamical model for vertical-cavity surface-emitting lasers (VCSELs) with cylindrical symmetry to show that self-sustained pulsations can appear in VCSELs with a small radius of the current aperture and a small built-in effective-index step. The appearance of these self-sustained pulsations is due to carrier-induced antiguiding: The waveguiding is improved during the front slope of the optical pulse as a result of the carrier depletion and is worsened on the back slope of the optical pulse because of the restoration of the carrier density.
© 2004 Optical Society of America
(140.5960) Lasers and laser optics : Semiconductor lasers
(190.4420) Nonlinear optics : Nonlinear optics, transverse effects in
(250.7260) Optoelectronics : Vertical cavity surface emitting lasers
Krassimir Panajotov, Guy Van der Sande, Hugo Thienpont, and Irina Veretennicoff, "Self-pulsation in vertical-cavity surface-emitting lasers as a result of the interplay between carrier-induced antiguiding and built-in index guiding," J. Opt. Soc. Am. B 21, 1192-1198 (2004)