Applied Physics Letters

We fabricated and tested a quantum well laser with asymmetric barrier layers. Such a laser has been proposed earlier to suppress bipolar carrier population in the optical confinement layer and thus to improve temperature-stability of the threshold current. As compared to the conventional reference laser structure, our laser with asymmetric barrier layers demonstrates reduced internal optical loss, lower threshold current density at elevated temperatures, and higher characteristic temperature (143 vs. 99K at 20 degrees C). (C) 2012 American Institute of Physics. [doi: 10.1063/1.3676085] Federal Target Program "Scientific and Scientific-Pedagogical Personnel of Innovative Russia" (arrangement no. 1.5 "Team research led by invited scientists," Grant No. 02.740.11.5161) (FLASH) from the Danish Council for Independent Research Grant No. 274-09-0247 European Commission for funding through the Marie Curie Incoming International Fellowship (Project No. 252890)