Dresden 2011 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie

Q 57.72: Poster

Thursday, March 17, 2011, 16:30–19:30, P1

Optical vortices of slow light using tripod scheme — •Algirdas Mekys, Julius Ruseckas, and Gediminas Juzeliunas — Institute of Theoretical Physics and Astronomy, Vilnius University, A. Goštauto 12, LT-01108 Vilnius, Lithuania

We consider propagation, storing and retrieval of slow light in a resonant atomic medium of cold atoms illuminated by two control laser beams of larger intensity [1,2]. The probe and two control beams act on atoms in a tripod configuration of the light-matter coupling. The first control beam is allowed to have an orbital angular momentum. Application of the second vortex-free control laser ensures the lossless (adiabatic) propagation of the probe beam at the vortex core where the intensity of the first control laser goes to zero. Storing and release of the probe beam is accomplished by switching off and on the control laser beams leading to the transfer of the optical vortex from the first control beam to the regenerated probe field. A part of the stored probe beam remains frozen in the medium in the form of atomic spin excitations, a number of which increases with increasing the intensity of the second control laser. We analyze such losses in the regenerated probe beam and provide conditions for the optical vortex of the control beam to be transferred efficiently to the restored probe beam.

[1] A. Raczynski, J. Zaremba, and S. Zielinska-Kaniasty, Phys. Rev. A, 75, 013810 (2007).

[2] J. Ruseckas, A. Mekys, and G. Juzeliunas, Opt. Spektrosc. 108, 438 (2010).