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Theory of the ultrafast nonlinear response of terahertz quantum cascade laser structures

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5 Author(s)
Weber, C. ; Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany ; Banit, F. ; Butscher, S. ; Knorr, A.
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Using density matrix theory, the linear and ultrafast nonlinear optical properties of a recently developed terahertz quantum cascade laser are investigated. All relevant excitation regimes, from coherent Rabi flopping up to the scattering dominated stationary response, are covered by the theory. It is shown that the coherence transfer between different periods is important to describe optical effects.

Published in:

Applied Physics Letters  (Volume:89 ,  Issue: 9 )