Low-threshold, continous-wave two-stack quantum-dot laser with reduced temperature sensitivity

Data are presented on continuous wave operation of two-stack quantum dot la sers designed with reduced temperature sensitivity in their threshold. The InAs quantum dots are designed to have a wide energy spacing (similar to 10 2 meV) between the ground and first excited radiative transitions. Selectiv ely oxidized stripe lasers have continuous wave threshold currents as low a s 1.2 mA for 2 mu m wide stripes and minimum threshold current densities of 26 A/cm(2) for 13-mu-m nide stripes. Broad area lasers have continuous wav e threshold current densities as:low as 40 A/cm(2), even for p-up mounting. Ground state lasing is:obtained-up to the highest temperature measured of 326 K.