LEEM, PEEM and Pulsed Illumination Frank Meyer zu Heringdorf, University of Duisburg-Essen
One
of the strengths of photoemission microscopy is the possibility to
combine PEEM with a wide variety of illumination sources. This tutorial
focuses on the time structure of the illumination that introduces two
new aspects into PEEM. First, a compression of the illumination in time
can easily create pulses with peak powers of several hundred kilowatts
and enables nonlinear emission pathways. Second, the stroboscopic
illumination can be used in pump-probe experiments to create slow-motion
movies of ultrafast processes with a time resolution of a few
femtoseconds. The tutorial will discuss ultrashort laser setups that are
commonly used for nonlinear and pump-probe microscopy and will discuss
some of the experimental issues such as dispersion management and space
charge. The tutorial will close with some views on the current state of
using electron pulses for illumination. |
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