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Q: Fachverband Quantenoptik und Photonik

Q 61: Poster Quanteneffekte

Q 61.9: Poster

Donnerstag, 22. März 2007, 16:30–18:30, Poster C

Non-linear processes in pulse propagation through closed-loop systems — •Robert Fleischhaker and Jörg Evers — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany

We discuss laser-driven atomic systems where the applied fields form a closed interaction loop. In general the properties of such closed-loop systems depend on the relative phase of the driving fields, which allows for a convenient manipulation of the optical properties. But on the other hand, these systems only reach a steady state in the long time limit, if the applied fields fulfill the so-called multiphoton resonance condition. If one of the laser fields is a pulsed probe field, then this condition is necessarily violated due to the finite frequency width of the probe pulse. To overcome this, recently the time-dependent properties of a four-level double-lambda type system have been investigated [1]. The time dependent solution to linear order in the probe field coupling has been found with the help of a Floquet decomposition. Using this formalism, here, we analyze non-linear effects in the probe field pulse propagation through closed-loop media. As an additional advantage of the Floquet decomposition, the various Floquet components can be interpreted as individual contributions to the medium response, thus providing insight into the physical origin of the results.

[1] M. Mahmoudi and J. Evers, Phys. Rev. A. in print (quant-ph/0609206)