Controll of secondary instabilities in broad-area lasers by external influence

Abstract

In this paper, we theoretically study the spatiotemporal dynamics of broad area lasers of dynamic class C. Such lasers are characterized by the development of Hopf instability, leading to pulsations of the output intensity, including chaotic ones. In the case of broad area lasers, spatial degrees of freedom additionally complicate the laser dynamics. Instabilities of homogeneous oscillations (secondary instabilities) lead to the formation of optical vortices, modulated standing waves and optical chaos. In this paper, we study the influence of external optical injection and modulation of the pump parameter on the spatiotemporal dynamics of a broad area laser. It is shown that injection of external radiation suppresses secondary instabilities, up to complete stabilization of radiation. We constructed bifurcation diagrams illustrating the parameter regions of the laser itself and the injected signal, at which secondary instabilities develop. Modulation of the pump parameter, on the contrary, "swings" secondary instabilities. We constructed bifurcation diagrams illustrating the regions of the laser parameters and the modulating signal, in which secondary instabilities develop. Thus, we showed that the combined use of external injection and modulation of the pump parameter allows controlling the development of secondary instabilities in broad area class C lasers. The results of the work can be used to develop next-generation optical neural networks.

Speaker

Anton Krents
Samara University, Lebedev Physical Institute
Russia

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