Reduction of internal loss and thermal resistance in diode lasers with coupled waveguides

The results of studying edge-emitting quantum-well lasers with a layered design having coupled planar waveguides, capable of suppressing the generation of excited transverse modes, are presented. In this case, a low internal loss (0.4 cm$^{-1}$) is provided, combined with a small depth ($\sim$0.9 $\mu$m) of the active region, which results in a low thermal resistance of 6.0 (K/W) mm without a submount.