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Quantum cascade lasers are of high interest in the scientific community dueto unique applications utilizing the emission in mid-IR range. The possibledesigns of QCL are quite limited and require careful engineering to overcomesome crucial disadvantages. One of them is an active region (ARn) overheat,that significantly affects the laser characteristics in the pulsed operationmode. In this work we consider the effects related to the non-equilibriumtemperature distribution, when thermal resistance formalism is irrelevant. Weemploy the heat equation and discuss the possible limitations and structuralfeatures stemming from the chemical composition of the AR. We show that thepresence of alloys in the ARn structure fundamentally limits the heatdissipation in pulsed and CW regimes due to their low thermal conductivity.Also the QCL post-growths affects the thermal properties of a device only in(near)CW mode while it is absolutely invaluable in the pulsed mode

QCL active region overheat in pulsed mode: effects of non-equilibrium heat dissipation on laser performance