An InP-based quantum cascade laser heterostructure emitting at 3.76 μm is grown with gas-source molecular beam epitaxy. The laser core is composed of strain balanced In0.76 Ga0.24 As/ In0.26 Al0.74 As. Pulsed testing at room temperature exhibits a low threshold current density (1.5 kA/ cm2) and high wall plug efficiency (10%). Room temperature continuous wave operation gives 6% wall plug efficiency with a maximum output power of 1.1 W. Continuous wave operation persists up to 95 °C.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)