[seminar] Podsjetnik na sutrašnji seminar na IF-u srijedu 25.09.2019. u 15:00h - Hamid Reza (Litva)

[Damir Dominko]

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*Institut za fiziku, Bijenička cesta 46,*

*predavaonica u zgradi Mladen Paić*

**srijeda, 25. 09. 2019. u 15:00 sati*
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*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*
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 [5].

[1] R. Pugatch, M. Shuker, O. Firstenberg, A. Ron, and N. Davidson, 
Phys. Rev. Lett. 98, 203601 (2007).
[2] H. R. Hamedi, J. Ruseckas, and G. Juzeliūnas, Phys. Rev. A 98, 
013840 (2018).
[3] H. R. Hamedi, J. Ruseckas, E. Paspalakis, and G. Juzeliūnas, Phys. 
Rev. A 99, 033812 (2019).
[4] H. R. Hamedi, E. Paspalakis, G. Žlabys, G. Juzeliūnas, and J. 
Ruseckas, Phys. Rev. A 100, 023811 (2019)
[5] H. R. Hamedi, V. Kudriašov, J. Ruseckas, and G. Juzeliūnas, Opt. 
Express 26, 28249-28262 (2018).

******Voditelji seminara IF-a: Ivan Balog <mailto:balog at ifs.hr> i Damir 
Dominko <mailto:ddominko at ifs.hr>**

-- 
Damir Dominko
Research associate
Institute of Physics Zagreb
Bijenicka cesta 46, 02-226
10000 Zagreb, Croatia
office: +385 1 469 8821
cell: +385958172990
e-mail: ddominko at ifs.hr

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