Broad gain bandwidth injectorless quantum-cascade lasers with a step well design Available to Purchase

The authors present a broad gain bandwidth injectorless quantum-cascade laser (QCL) with a “short period superlattice” design which provides an equivalent GaInAlAs alloy quantum step well in each active module. Devices employing the proposed step well design demonstrate an ultrabroadband gain spectrum of $480cm−1$ $(∼4μm)$ around the threshold at room temperature in pulsed mode. The fabricated $30μm$ wide and 4 mm long laser shows the lowest room temperature threshold current density of $1.1kA/cm2$ among the broad gain QCLs emitting at similar wavelengths and a high slope efficiency of 1.6 W/A at room temperature in pulsed mode.