Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 59: Quanteneffekte (Lichtstreuung II)
Q 59.2: Vortrag
Donnerstag, 22. März 2007, 14:15–14:30, 5E
Light propagation beyond the multiphoton resonance condition — •Jörg Evers1 and Mohammad Mahmoudi1,2 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg — 2Physics Department, Zanjan University, P. O. Box 45195-313, Zanjan, Iran
The light propagation of a probe field pulse is studied in atomic media where the applied laser fields form a closed interaction loop [1]. Such systems have interesting properties, but only admit a time-independent analysis if the laser field detunings satisfy the so-called multiphoton resonance condition. This condition, however, is violated in light propagation in particular for short pulses with a large frequency width. To overcome this limitation, we solve the time dependent problem using a Floquet decomposition of the equations of motion, and identify the processes contributing to the medium response. We then show that our four-level double-Λ type model system allows for sub- and superluminal light propagation with small absorption or even gain, controlled by one of the coupling field Rabi frequencies.
[1] M. Mahmoudi and J. Evers, Phys. Rev. A. in print (quant-ph/0609206)