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A room-temperature continuous-wave operating midinfrared light emitting device
An optimized light source for the 45 µm wavelength region with a continuous-wave output power of 2 mW at ambient temperature is introduced. The device is based on a narrow-gap lead salt semiconductor chip, which is optically pumped by a standard high-power diode laser array. Surface patterning is employed and leads to an up to sixfold increase in out-coupling efficiency compared to untreated chip surfaces. A model is presented that explains this enhancement of the light extraction. Output efficiencies of 4×104 are achieved.