Wallplug efficiency of quantum cascade lasers: Critical parameters and fundamental limits
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(Color online) Wallplug efficiency as a function of photon energy. Filled squares: experimental values in continuous wave from Refs. 3–9 Solid disk: pulsed values from Refs. 7,12,18–20 The solid line represents the prediction from expression (6) with the key parameters derived from Ref. 12. The influence of a shorter or longer in-plane dephasing time is shown by the two dotted curves. Long dashed lines represent the prediction from the model scaled by a factor of 0.4.
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