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Series in Quantum Electronics
edited by
Henry Baltes, Peter Günter, Ursula Keller,
Fritz K. Kneubühl †, Walter Lukosz,
Hans Melchior, Markus W. Sigrist
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Vol. 59 Matthias Weger, Attosecond Velocity-Map-Imaging: Design, Setup and Angular
Streaking Experiments. 1st edition 2013. XXII, 100 pages, € 64,00. |
Tunneling is a
very fundamental phenomenon in quantum mechanics. The question of the duration
of the tunneling process itself has been raised before. Experiments give
different outcomes and different theories predict different tunneling times. In
strong field physics tunneling time has been measured to amount to 12as with an
error bar including zero tunneling delay.
This thesis
describes the extension of the attosecond angular
streaking technique using a Velocity Map Imaging Spectrometer. The apparatus
for strong field experiments in the attosecond regime
has been designed for various strong-field experiments. It has been set up and
tested in the course of this thesis.
Angular streaking
measurements are presented. The accessible intensity range for this class of
experiments is extended to lower intensities and the measurement accuracy
improved.
In the
previously examined intensity range a tunneling delay of 36as was measured, independently
of the exact electrical field strength in the laser focus. For lower electrical
field strengths, an increase of the delay time was measured. However, it is not
entirely clear, whether the tunneling picture is still applicable in this
regime.
About the author:
Matthias Weger received his diploma in physics in 2007 from Julius-Maximilians-Universität in Würzburg working on High Harmonic Generation. He joined the
Institute of Quantum Electronics at ETH Zurich in the same year, continuing to
work in strong field physics in Ursula Keller's group. His research interests
include attosecond streaking experiments, especially
angular attosecond streaking (attoclock).
Other interests lie in scientific instrumentation such as novel oprical parametric amplifiers and electron momentum
spectrometers.
Keywords: .
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