Ridge-waveguide laser diodes emitting near 2.38 mu m have been fabricated f
rom GaInAsSb-GaSb type-II quantum-well (QW) structures grown by molecular b
eam epitaxy, These devices operated continuous-wave (CW) at room temperatur
e, what is obtained for the first time from a type-II QW laser. At 23 degre
es C threshold currents in the range 60-140 mA and CW output powers exceedi
ng 1 mW/facet were obtained. These lasers showed a tendency to operate in a
single longitudinal mode with a temperature red shift of 0.1 nm/degrees C
and a current red shift of 0.06 nm/mA.