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Theory of the ultrafast nonlinear response of terahertz quantum cascade laser structures
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Band structure and wave functions for the investigated terahertz QCL (Ref. 13 ) at a bias drop of per period with the laser levels (4,5) marked (thick lines).

Image of FIG. 2.
FIG. 2.

Linear optical absorption spectra of the terahertz QCL from Ref. 13 at different temperatures and an operating bias of . The inset shows the gain peak for the two scattering processes treated independently, electron-phonon (dashed line) and electron-impurity interactions (solid line) at .

Image of FIG. 3.
FIG. 3.

(Left) Rabi flopping as well as population relaxation of the five subbands of the QCL from Ref. 13 for a pulse excitation with Gaussian pulse durations of (a) , (b) , and (c) . (Right) Electric field of the corresponding pulses.

Image of FIG. 4.
FIG. 4.

Temporal evolution of two subband densities for the situation in Fig. 3(a) showing the effect of the periodically coupled structure for (a) the undamped system and (b) the fully damped system. The dynamics including (thick lines) and excluding (thin lines) interperiodic coherences are shown.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Theory of the ultrafast nonlinear response of terahertz quantum cascade laser structures