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Q: Quantenoptik

Q 6: Atom Optics II

Q 6.6: Vortrag

Montag, 2. April 2001, 18:45–19:00, H 104

Multiple-photon exchange in atom optics: intensity- and density-dependent effects — •Konstantin Krutitsky, Peter Marzlin, and Jürgen Audretsch — Fakultät für Physik, Universität Konstanz, Fach M 674,Konstanz 78457, Germany

We present the rigorous microscopic quantum-field theory of the interaction of an ultracold Bose gas with the electromagnetic field of vacuum and laser photons. The main attention has been paid to the consistent consideration of dynamical dipole-dipole interactions in intense photon fields.

We have derived the general system of Maxwell-Bloch equations for atomic creation and annihilation operators and the propagation equation for the laser field, which can be used for the self-consistent analysis of various linear and nonlinear phenomena in atom optics at high densities of the atomic system and high intensities of the laser radiation.

A general procedure of the elimination of the excited state has been developed. The annihilation and creation operators of the excited state are represented in the form of a series expansion in powers of the inverse detuning, which corresponds to multiple-photon-exchange processes of different orders between the atoms.

Optical properties of an ultracold Bose gas are investigated and formula for the refractive index is derived. We discuss different possibilities of manipulation the propagation of the ultracold dense atomic beams with the aid of intense laser radiation.

K.V.K. would like to thank Alexander-von-Humboldt Stiftung for financial support.