Résumé
Stimulated emission (SE) at multiple wavelengths up to 20.3 μm (14.7 THz) is demonstrated from HgCdTe based quantum well heterostructures. The mitigation of Auger processes resulting from the energy spectrum in structures under study is exemplified. By studying the carrier lifetime we show that further increase in SE wavelength is feasible and discuss the promising routes towards the 5 - 15 THz frequency domain, where quantum cascade lasers are scarce and HgCdTe lasers may be competitive to the prominent emitters.