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<div style="color: rgb(0, 0, 0); font-family:
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times, serif; font-size: 12pt; text-align: center;"><strong><b><span
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src="cid:part1.D34790AF.1B08BFF8@ifs.hr"
data-mce-src="imap://ddominko@mail.ifs.hr:143/fetch%3EUID%3E/INBOX%3E40129?header=quotebody&part=1.1.2.2&filename=logo_IF_seminar.jpg"
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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>
</strong></div>
<div style="color: rgb(0, 0, 0); font-family:
"times new roman", "new york",
times, serif; font-size: 12pt; text-align: center;"><strong></strong> </div>
<div style="text-align: center;"><span style="color:
rgb(85, 145, 60); font-family: "times new
roman", serif; font-size: 12pt;"><span
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>
<div style="color: rgb(0, 0, 0); font-family:
"times new roman", "new york",
times, serif; font-size: 12pt; text-align: center;"> </div>
<div style="text-align: center;">
<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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<div style="color: rgb(0, 0, 0); font-family:
"times new roman", "new york",
times, serif; font-size: 12pt; text-align: center;"><span
style="font-size:small;font-family:'arial'"></span> </div>
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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<div style="color: rgb(0, 0, 0); font-family: arial,
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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