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(X-ray diffraction rocking curves of the MOVPE-grown terahertz QCL. Satellite peaks are visible up to the 15th order attesting for the very stable growth rate along the whole structure. Inset: atomic force microscopy image of the epitaxial layer surface showing a step bunched pattern with . The vertical color scale spans .)
(Output peak power vs injected current curves recorded at different temperatures for a laser bar long and wide processed with a Schottky-like top contact. Laser emission up to is observed in pulsed regime with a threshold current density at . In the inset the threshold current density vs the operating temperature is plotted. A characteristic temperature is extracted.)
(Current vs voltage curve and output peak power vs injected current curves for a laser bar long and wide. The top contact metallic layer was partially alloyed. A maximum operating temperature of is observed.)
(Spectral evolution of the lasing emission observed for two different bias levels from a QCl sample long and wide. The spectra were recorded, respectively, at and .)
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