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                    <p style="text-align:center;margin:0px"
                      align="center"><b><span
                          style="font-family:'century gothic' ,
                          sans-serif;color:#5f5f5f" lang="EN-GB">Institut
                          za fiziku, Bijenička cesta 46,</span></b></p>
                    <p style="text-align:center;margin:0px"
                      align="center"><b><span
                          style="font-family:'century gothic' ,
                          sans-serif;color:#5f5f5f" lang="EN-GB">predavaonica
                          u zgradi Mladen Paić</span></b></p>
                    <strong><b><span
                          style="font-size:14pt;font-family:'century
                          gothic' , sans-serif;color:#993300"
                          lang="EN-GB">srijeda, 25. 09. 2019. u 15:00
                          sati</span></b><br>
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                        style="font-size:21.3333px"><b><font face="times
                            new roman, serif">Light beams carrying
                            orbital angular momentum interacting with
                            cold atoms</font></b></span></span><font
                      face="times new roman, serif" color="#55913c"><span
                        style="font-size: 21.3333px;"><b></b></span></font></div>
                  <div style="text-align: center;"><font face="century
                      gothic, sans-serif"><span style="font-size:
                        18.6667px;"><b>dr. Hamid Reza Hamedi</b></span></font></div>
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                    "times new roman", "new york",
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                    <div style="text-align: center;"><font face="century
                        gothic, sans-serif"><span style="font-size:
                          14.6667px;"><b>Institute of Theoretical
                            Physics and Astronomy, Vilnius University,
                            Sauletekio 3, Vilnius LT-10257, Lithuania</b></span></font><span
                        style="font-size:small;font-family:'arial'"></span>   
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                  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]. <br>
                  <br>
                  [1] R. Pugatch, M. Shuker, O. Firstenberg, A. Ron, and
                  N. Davidson, Phys. Rev. Lett. 98, 203601 (2007).<br>
                  [2] H. R. Hamedi, J. Ruseckas, and G. Juzeliūnas,
                  Phys. Rev. A 98, 013840 (2018).<br>
                  [3] H. R. Hamedi, J. Ruseckas, E. Paspalakis, and G.
                  Juzeliūnas, Phys. Rev. A 99, 033812 (2019).<br>
                  [4] H. R. Hamedi, E. Paspalakis, G. Žlabys, G.
                  Juzeliūnas, and J. Ruseckas, Phys. Rev. A 100, 023811
                  (2019)<br>
                  [5] H. R. Hamedi, V. Kudriašov, J. Ruseckas, and G.
                  Juzeliūnas, Opt. Express 26, 28249-28262 (2018).<br>
                  <br>
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                  helvetica, sans-serif; font-size: 12pt; text-align:
                  left;"><b><span
                      style="font-size:12pt;font-family:'century gothic'
                      , sans-serif" lang="EN-GB"><b><span
                          style="font-size:11pt;font-family:'century
                          gothic' , sans-serif" lang="EN-GB"> </span></b></span></b><b><span
                      style="font-size:12pt;font-family:'century gothic'
                      , sans-serif" lang="EN-GB"><b><span
                          style="font-size:11pt;font-family:'century
                          gothic' , sans-serif" lang="EN-GB">Voditelji
                          seminara IF-a: <a moz-do-not-send="true"
                            href="mailto:balog@ifs.hr">Ivan Balog</a> i <a
                            moz-do-not-send="true"
                            href="mailto:ddominko@ifs.hr">Damir Dominko</a><br>
                        </span></b></span></b></div>
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    <pre class="moz-signature" cols="72">-- 
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: <a class="moz-txt-link-abbreviated" href="mailto:ddominko@ifs.hr">ddominko@ifs.hr</a></pre>
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