Mid-infrared properties of quantum dot lasers

Inter-sublevel transitions in InGaAs/AlGaAs quantum dots (QDs) in the mid-infrared (MIR) wavelength range are investigated by means of absorption and optically and electrically pumped emission spectroscopy. Charging dependent energy shifts of inter-sublevel transitions observed in calorimetric absorption spectra are attributed to few-particle effects in the QDs. MIR emission from near-infrared QD lasers is observed in the MIR lasing mode below threshold, which is confirmed by a theoretical modelling of such a bipolar lasing device. In contrast, spontaneous MIR emission is recorded for optically pumped Qds.

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