Synchrotron infrared transmission spectroscopy of a quantum cascade laser correlated to gain models

What is it about?

We measure the broadband optical gain and absorption spectra between 0.1 and 0.7?eV in a two-phonon resonance design quantum cascade laser, with the infrared beam of a synchrotron light source, and correlate them to established simulation models, based on the density matrix formalism, and on the non-equilibrium Green's function theory. We show that accounting for the distribution of carriers in momentum space improves the description of the high-energy absorption from the excited states located

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