Seminar: Light beams carrying orbital angular momentum interacting with cold atoms dr. Hamid Reza Hamedi
Institute of Theoretical Physics and Astronomy, Vilnius University, Sauletekio 3
Vilnius LT-10257, Lithuania
25.09.2019. u 15:00h
IF - predavaonica u zgradi Mladen Paić

The interaction of coherent light with atomic systems allow observation of several important and interesting quantum interference effects such as coherent population trapping (CPT), electromagnetically induced transparency (EIT) and stimulated Raman adiabatic passage (STIRAP). These phenomena are based on the coherent preparation of atoms in a so-called dark state which is immune against the loss of population through the spontaneous emission. On the other hand, light can carry an orbital angular momentum (OAM). Such light beams have helical (twisted) wavefronts that spiral along the beam direction much like a corkscrew. A number of interesting effects appear when this type of optical beams interact with the atomic systems. Among them optical vorticities of slow light have caused a considerable interest, as the OAM brings a new degree of freedom in manipulation of the optical information during the storage and retrieval of the slow light [1]. We have devoted some attention to the interplay of light carrying OAM and atomic systems. During this talk, I will review some of our recent works on different scenarios for the exchange of optical vortices in atom-light coupling setups [2-4]. I will try to talk also about a scenario for detection of the structured light by measuring the absorption profile of a weak nonvortex probe beam in a highly resonant five-level atom-light coupling setup.

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