Leaky-mode buried-heterostructure AlGaAs injection lasers

Leaky-mode buried-heterostructure injection lasers are fabricated and operated successfully under pulse bias at room temperature. The lasers consist of a thin active layer confined by parallel n- and p-AlxGa1−xAs layers with a high mole fraction of AlAs (x=0.4) and perpendicular p−-AlyGa1−yAs layers with a low mole fraction of AlAs (y=0.25). It is shown that most of the laser power can be coupled out into the low-loss perpendicular layers and emitted from the end facets, resulting in highly collimated beams with a beam divergence of about 1°.