We demonstrate room temperature midinfrared electroluminescence from intersublevel transitions in self-assembled InAs quantum dots. The dots are grown in GaAs/AlGaAs heterostructures designed to maximize current injection into dot excited states while preferentially removing electrons from the ground states. As such, these devices resemble quantum cascade lasers. However, rigorous modeling of c...

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Quantum Cascade lasers In article number 2100242, Barbara Schneider and co-workers present strong microwave injection in quantum cascade laser frequency combs as a means for controlling the lasing state. Varying modulation power enables us to broaden shift spectral output well modify phase profile. Moreover, fast gain dynamics enable rapid switching between separate regions with just single dev...

Quantum cascade ~QC! lasers, based on intersubband transitions in semiconductor quantum wells, are characterized by ultrafast ~picosecond! carrier lifetimes. An important consequence of this unique property is the expected absence of relaxation oscillations in the transient response of these devices. Here, we discuss and experimentally verify this prediction by measuring the modulation response...

We describe a prototype instrument using a Peltier cooled quantum cascade laser for precise measurement of stable carbon (C/C) isotopologue ratios in atmospheric CO2. Using novel optics and signal processing techniques in a compact instrument, we are able to detect the difference between sample and reference with a precision of 0.1‰ (2σ std error of mean of 11 samples) in 10 minutes of analysis...