Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 61: Quanteneffekte: Lichtstreuung

Q 61.4: Talk

Friday, March 16, 2012, 11:15–11:30, V7.01

Multiple Scattering of Intense Laser Light by Cold Atoms — •Tobias Binninger, Thomas Wellens, Vyacheslav Shatokhin, and Andreas Buchleitner — Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg

An accurate description of multiple scattering of intense laser light by a cloud of cold atoms requires a combined treatment of the nonlinear atomic response to strong laser light and of the propagation of the scattered light fields through the atomic medium, since the latter determines the strength of the nonlinear saturation for atoms deep inside the bulk. For this purpose, we use a combination of two different methods: a pump-probe approach previously developed in our group for double scattering of laser light by two two-level atoms [1], and a diagrammatic theory for multiple scattering by classical nonlinear scatterers [2]. Thereby, we find a set of equations describing the spatial distribution and spectra of the diffusing part of the light intensity in the bulk of the medium after average over the disordered positions of the scatterers. We present results of numerical simulations for the solutions of this set of equations.

[1] T. Wellens, T. Geiger, V. Shatokhin, and A. Buchleitner, Phys. Rev. A 82, 013832 (2010)

[2] T. Wellens and B. Grémaud, Phys. Rev. Lett. 100, 033902 (2008).