Abstract
We present second-harmonic surface emission from distributed feedback GaAs∕AlGaAs quantum-cascade lasers with integrated intersubband nonlinearities. The devices show single mode fundamental and second-harmonic emission at wavelengths of 10.7 and 5.35μm, respectively. Only 5.35μm light is emitted from the surface, as the fundamental light is not coupling to radiating modes for the grating of our choice. The second-harmonic peak optical power via the surface at 78K is 150μW for a fundamental peak power of 1.1W.
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