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Schematic conduction band diagram of one stage of both active regions of the heterogeneous cascade with the moduli squared of the computed wave functions. Active region is simulated under an applied electric field of and active region under an applied electric field of .
Electroluminescence spectra of a square mesa sample at . The FWHM is and the frequency range over which is larger than .
Peak optical power and bias as functions of the injection current for a high-reflection coated long, wide chip. Inset: lasing spectra at under a bias of (linear scale).
The two extreme spectra of the EC-QCL. Inset time-resolved spectrum taken between 12 and after the beginning of the pulse.
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