Hamburg 2009 – scientific programme

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MO: Fachverband Molekülphysik

MO 13: Molekülphysik Poster 1

MO 13.24: Poster

Tuesday, March 3, 2009, 16:30–19:00, VMP 8 Foyer

Implementation of the von Neumann basis in a genetic algorithm — •Stefan Ruetzel¹, Christoph Stolzenberger¹, Susanne Fechner¹, Frank Dimler¹, David J. Tannor², and Tobias Brixner¹ — ¹Institut für Physikalische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — ²Department of Chemical Physics, Weizmann Institute of Science, 76190 Rehovot, Israel

The representation of ultrashort laser pulses in phase space, i.e. in a joint-time-frequency representation, is a suitable way to simultaneously show both temporal and spectral features. Especially when using adaptive quantum control in combination with pulse shaping this type of representation can help to identify and to interpret the main features of the often complex structured pulses.

Recently we introduced the von Neumann representation based on a paper by John von Neumann and showed first experimental implementations of this technique. Here we present in more detail how to define and characterize ultrashort laser pulses in the von Neumann picture. We integrated the von Neumann representation into a genetic algorithm (GA) by encoding the temporal and spectral position as well as the amplitude and the phase of the von Neumann pulses into the GA gene values. The practicability of this basis was shown by simulations and the generated pulses were analyzed by spectral interferometry (SI).