Abstract
We employ a microprobe photoluminescence (PL) technique to determine the thermal resistance and wall-plug efficiency of narrow-ridge interband cascade lasers emitting at 3.8 μm. Using two different semiconductor epilayers as integrated thermometers, the local lattice temperature is extracted from the PL spectra and the wall-plug efficiency (ηw) derived from the slope of the temperature increase versus electrical power. The maximum ηw at 78 K is found to be 8.1±0.5%, and a fit to the lattice temperature gradient implies cross-plane thermal conductivities of 4.5–6.5 W/m K for the short-period InAs/AlSb superlattice cladding and of ≈1.5–4 W/m K for the active region.
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