Fabrication and Characterization of 5.2 um Quantum-Cascade Lasers Grown by Molecular-Beam Epitaxy

We present the results on the fabrication and time-resolved spectral characterization of 5.2 um range quantum-cascade laser. 40 stages of active region are based on strain-compensated In0.6Ga0.4As/In0.44Al0.56As heteropair. The mutli-mode lasing was demonstrated in the 5.09-5.21 um spectral range for lasers with four-cleaved facets. The estimated values of the threshold current density and voltage at 80 K were about 1.1 kA/cm
²
and 15 V, respectively. The maximal lasing temperature for lasers with four-cleaved facets was about 210 K.