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<p>Dear colleagues,</p>
<p>It is my pleasure to invite you to Seminar of Institute of
Physics of Charles University, entitled:</p>
<p> <b>Optical control of free electron beams – from inelastic
scattering to quantum coherent interaction</b>
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<p>Speaker: <a moz-do-not-send="true"
href="https://physics.mff.cuni.cz/kchfo/ooe/kozak/">RNDr. Martin
Kozák, Ph.D.</a>
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<br>
Time: Tuesday 1.11.2021 from 14:00<br>
<br>
Place: Seminar room of Institute of Physics F285 (atelier) ,
second floor, Ke Karlovu 5, Prague</p>
<p><i>Abstract:</i><i><br>
</i></p>
<p><i>The natural time scales of electron wave packet dynamics in
atoms, molecules, and solids lie in the attosecond time domain
(1 as=10^−18 s). On the other hand, the spatial dimensions of
electron orbitals are of the order of tens of picometers
corresponding to the resolution of state-of-the-art electron
microscopes. The combination of atomic spatial and attosecond
temporal resolutions can be provided by highly coherent pulsed
electron beams with density profiles modulated in the time
domain by the interaction with coherent light fields.<br>
</i></p>
<i>In this talk I will discuss the interaction of electrons with the
ponderomotive potential of an optical travelling wave generated by
two-color laser fields in vacuum. I will show that such process
can efficiently accelerate sub-relativistic electrons and in the
same time it can serve for generation and detection of attosecond
electron pulse trains. Apart from classical scattering regime,
this technique offers an opportunity for quantum coherent
modulation of electron wavefunction in time domain, which can be
considered as a generalization of Kapitza-Dirac experiment. By
using tailored light fields, more advanced spatio-temporal shaping
of electron wavepackets is possible, such as generation of
isolated attosecond electron pulses or electron vortex states.</i><br>
<p>With my best regards</p>
Jaroslav Hamrle
<pre class="moz-signature" cols="72">--
------------------------------------------------------------------
Mgr. Jaroslav Hamrle, Ph.D.
Institute of Physics, room F232
Faculty of Mathematics and Physics
Charles University
Ke Karlovu 5
121 16 Prague
Czech Republic
tel: +420-95155 1340
email: <a class="moz-txt-link-abbreviated" href="mailto:hamrle@karlov.mff.cuni.cz">hamrle@karlov.mff.cuni.cz</a>
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