Investigation of the efficiency of incoherent external optical injection on stabilization of broad-area semiconductor VCSELs
Elizaveta A. Yarunova,1,2 Anton A. Krents 1,2 Nonna E. Molevich 1,2 1 Samara National Research University, Samara, Russia 2 Lebedev Physical Institute, Samara, Russia
Abstract
Broad-area semiconductor vertical-cavity surface-emitting laser (VCSELs) are exposed to modulation instability leading to chaotic filamentation in the transverse profile of the laser beam. It is shown that using weak optical injection it is possible both to transform chaotic filaments into regular stationary optical structures (stripes and hexagons) and to completely stabilize broad-area VCSELs. It is important that this effect has a threshold character. Taking into account the frequency detuning between the injected field frequency and cavity mode frequency does not destroy the stabilization effect. Increasing the modulus of frequency detuning leads to a slight increase in the amplitude of optical injection required for stabilization.The paper is based on the investigation of the system of differential equations describing VCSEL. The research is supported by the numerical solution of the system of differential equations and also confirmed by linear stability analysis of the homogeneous stationary solution.In addition, the mechanism of suppression of modulation instability is determined. It was found that stabilization in this case is achieved by injection-controlled changes in the magnitude of the stationary generation field, rather than by suppression of relaxation oscillations, as in the case of traveling wave and parametric instabilities.
Speaker
Elizaveta Yarunova
Lebedev Physical Institute, Samara, Russia
Russia
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