High temperature continuous wave operation of Sb-based vertical external cavity surface emitting laser near 2.3 μm

International audienceThe growth conditions and the operation of a diode-pumped AlGaAsSb/GaInAsSb type-I quantum-well vertical cavity surface emitting laser emitting near 2.3μm in an external cavity configuration are reported. The epitaxial structure was grown in two steps on a GaSb substrate by molecular beam epitaxy. It is made of a GaSb/AlAsSb Bragg reflector, a GaInAsSb/AlGaAsSb multi quantum-well active region and an AlAsSb heatspreader layer. A TEM00 low-divergence laser continuous wave mode operation was demonstrated from 277K up to 350K. A characteristic temperature T0 as high as 74K was measured just below 300K. Threshold incident pump power as low as 600 W/cm2 at 277K and a maximum output power of 8.5mW at 288K was observed