- C. Weber, F. Banit, S. Butscher, and A. Knorr
- Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany
- A. Wacker
- Fysiska Institutionen, Lunds Universitet, Box 118, 22100 Lund, Sweden
(Received 9 March 2006; accepted 10 July 2006; published online 30 August 2006)
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. ©2006 American Institute of Physics
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