Improved CW operation of quantum cascade lasers with epitaxial-side heat-sinking

First results on the epilayer-side mounting of quantum cascade (QC) lasers are presented. Operated;in continuous-wave (CW) mode, these lasers are supe rior to substrate-bonded devices. The maximum CW temperature is raised by 2 0 K (up to 175 K), and, at comparable heat sink temperatures, the performan ce with respect to threshold current, output power, and slope efficiency is greatly improved for the epilayer-side mounted devices. QC-laser-specific mounting procedures are discussed in this letter, such as the high reflecti vity coating of the back-facet and the front-facet cleaving after mounting, Modeling of the temperature distribution inside the QC laser shows a stron g temperature gradient within the active waveguide core, which partly expla ins the still low maximum CW operating temperatures.