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Wallplug efficiency of quantum cascade lasers: Critical parameters and fundamental limits
10.R. Terazzi, T. Gresch, M. Giovannini, N. Hoyler, N. Sekine, and J. Faist, Nat. Phys. 3, 329 (2007).
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Fundamental limits in the wallplug efficiency of quantum cascade lasers are derived in a rate equation model that uses global effective parameters. Free carrier absorption and thermal population of the lower state force a strong downward trend of this efficiency with increasing wavelength, that agrees well with experimental data taken from literature.
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