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The indirect pump scheme is proposed to clarify its feasibility. The high device-performance of mid-infrared quantum-cascade lasers based on the proposed scheme is demonstrated: in particular, very high T0-values of 240~400 K around room temperature.
We demonstrate room temperature, CW operation of a 5.2 mum quantum-cascade laser with single phonon resonance-continuum depopulation structure, grown by MOVPE. The laser exhibits a simple ridge structure without high reflection coatings.
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