Résumé
This paper develops a new generation of InAs/AlSb based quantum cascade lasers (QCLs) covering the 16-35 μm spectral region. The study targets high performance, in terms of output power, single mode operation and maximum operating temperature. Here, recent developments on InAs/AlSb based QCLs operating at wavelengths of 17-19 μm are reported. The maximum operating temperature achieved is 333 K at λ=17.9 μm. These values represent a new reference at long IR wavelengths. Distributed feedback (DFB) lasers featuring spectrally single mode operation are also reported.