Modelling of optical Kerr effects on the static and dynamic behaviors of quantum cascade laser

The effect of optical Kerr nonlinearity on the static and dynamic behaviors of quantum cascade laser operating in the mid-infrared is theoretically investigated. Our model is based on three-level rate equations including the dependence of the loss on photon number in the cavity. The optical stability domain that allows for the determination of current injection is derived within the premises of our model. The analytical solutions of eigenvalue equation allowing the investigation of stability analysis are obtained. Furthermore, nonlinear effects influence significantly the dynamics of photons in cavity and electrons in the upper laser level.

Research Highlights► A rate equation model of QC laser with optical Kerr nonlinearity is investigated. ► Optical Kerr nonlinearity can affect the optical stability domain dramatically. ► A linear stability analysis shows that the QC laser develops instabilities. ► The dynamic transient can be modified by varying optical Kerr nonlinearity.