Národní úložiště šedé literatury Nalezeno 1 záznamů.  Hledání trvalo 0.01 vteřin. 
Shaping of light fields for control and correction of electron beams
Brada, Tomáš ; Bouchal, Petr (oponent) ; Hrtoň, Martin (vedoucí práce)
Electrons in an electron microscope are commonly controlled by static electric and magnetic fields. However, there is also the possibility to modify the electron trajectory through the ponderomotive potential created by a laser pulse. This work focuses on creating specially shaped laser beams for this purpose. The first part explains the principle of operation of a light-controlled electron microscope. This is followed by an introduction to the spatial light modulator, which will be used for beam shaping. Then, the search for a phase mask for the spatial modulator is discussed, including commentary on simulation methods for light propagation, a review of iterative algorithms for phase retrieval, and the development process of a custom algorithm. Finally, the developed algorithm is tested in an experiment.

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