980 nm high power quantum dot lasers improved high temperature properties

Summary form only given. The inherent features of quantum dot lasers like their higher wavelength stability compared to quantum well lasers and a reduced lateral carrier diffusion make them especially interesting for high power applications such as the pumping of rare earth lasers or fiber amplifiers. Quantum dot lasers have already been shown to have the potential for high power applications at different wavelengths. We present quantum dot lasers with improved high temperature properties. To summarize, we have realized high power quantum dot lasers with output powers as high as 3.8 W from a single facet which is twice as high as previously reported values. The high internal quantum efficiency of about 90% and the low internal absorption level of the laser structure allow wall plug efficiencies above 50%. In addition, the lasers show very good high temperature properties and thus overcome a crucial drawback of existing devices. The presented lasers are the first high power quantum dot lasers suitable for industrial applications.