Demonstration of (gimel approximate to 11.5-mu m) GaAs-based quantum cascade laser operating on a peltier cooled element

We demonstrate an average power of 2 mW at lambda approximate to 11.5 mum a nd 233 K, for a GaAs-based quantum cascade laser mounted on a Peltier coole r Furthermore, a maximum operating temperature of 285 K has also been demon strated. These results are attributed to the excellent intrinsic thermal ch aracteristics of these lasers and good heat management, achieved through th e structural design and epi-side down mounting. Measurements show a thermal resistance of 6.7 K/W at 233 K, in good agreement with our models.