InAsSb/AlAsSb double-heterostructure diode lasers emitting at 4 μm

Abstract
Double‐heterostructure InAsSb/AlAsSb diode lasers emitting at 4 μm have been fabricated. The laser structure was grown on GaSb substrates by molecular beam epitaxy. The devices exhibit continuous wave operation at temperatures up to 80 K, and pulsed operation up to 155 K. The lowest threshold current density is 33 A/cm2 obtained at 50 K, but the characteristic temperature is only 17 K.