Applied Physics Letters · 2009 · 87 citations · 14 references
EngineeringElectrical EngineeringMaterials ScienceOptoelectronicsPhotonicsSemiconductor DevicesLaser PhysicsOptical ResonatorsPhotonic Integrated CircuitsSemiconductor HeterostructuresSemiconductor LasersWaveguidesCavity DesignHeterostructure DevicesHeterostructure LasersHigh-power Semiconductor LasersLaser Cavity DesignPower OutputQuantum Cascade LasersQuantum Cascade Structures
A quantum cascade laser structure based on three-phonon-resonance design is proposed and demonstrated. Devices, emitting at a wavelength of 9 μm, processed into buried ridge waveguide structures with a 3 mm long, 16 μm wide cavity and a high-reflection (HR) coating have shown peak output powers of 1.2 W, slope efficiencies of 1 W/A, threshold current densities of 1.1 kA/cm2, and high wall-plug efficiency of 6% at 300 K. A 3 mm long, 12 μm wide buried-heterostructure device without a HR coating exhibited continuous wave output power of as high as 65 mW from a single facet at 300 K.
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