Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 43: Poster II
Q 43.46: Poster
Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof
all-optical light beam steering beyond the paraxial approximation — •lida zhang1, Tarak N. Dey2, and Joerg Evers1 — 1Max-Planck-Institut f\"{u}r Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg — 2Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
We discuss all-optical steering of an optical beam. For this, we study light propagation in a suitable atomic medium driven beyond the paraxial approximation. Control fields are chosen such that they in essence optically create waveguide-like structures in the medium which allow to propagate the probe beam in a controlled way. We show that a branched waveguide can be implemented by employing control fields consisting of two parallel and one tilted Gaussian beams. This way, an input probe beam can be distributed between two output ports in an optically controlled way. The switching between the output ports can be controlled via the properties of the tilted coupling field. Interestingly, we find significant deviations from calculations in paraxial approximation already for light propagating in a single optically generated waveguide.