Articles you may be interested inInvestigation of thermal properties of mid-infrared AlGaAs/GaAs quantum cascade lasers J. Appl. Phys. 112, 043112 (2012); 10.1063/1.4746791 Lasing-induced reduction in core heating in high wall plug efficiency quantum cascade lasers Appl. Phys. Lett. 94, 041101 (2009); 10.1063/1.3073044Optical and thermal characteristics of narrow-ridge quantum-cascade lasers

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We demonstrated an unambiguous quantum dot cascade laser based on InGaAs/GaAs/InAs/InAlAs heterostructure by making use of self-assembled quantum dots in the Stranski-Krastanow growth mode and two-step strain compensation active region design. The prototype generates stimulated emission at λ ~ 6.15 μm and a broad electroluminescence band with full width at half maximum over 3 μm. The characteristic temperature for the threshold current density within the temperature range of 82 to 162 K is up to 400 K. Moreover, our materials show the strong perpendicular mid-infrared response at about 1,900 cm-1. These results are very promising for extending the present laser concept to terahertz quantum cascade laser, which would lead to room temperature operation.PACS42.55.Px; 78.55.Cr; 78.67.Hc