Hannover 2010 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 24: Poster: Quantum Control

MO 24.7: Poster

Donnerstag, 11. März 2010, 16:00–18:30, Lichthof

Evolutionary sculptured 3-dimensional photoelectron wave packets — Marc Krug, •Manuel Gerlach, Qingqing Liang, Tim Bayer, Jens Köhler, Matthias Wollenhaupt, and Thomas Baumert — Universität Kassel, Institut für Physik und CINSaT, Heinrich-Plett-Str. 40, D-34132 Kassel, Germany

We present an approach to sculpt 3-dimensional photoelectron wave packets resulting from the excitation and ionization of atomic potassium using polarization-shaped fs laser pulses. Polarization shaped pulses are generated employing a Fourier-transform pulse shaper providing full control over the ellipticity of all spectral pulse components. The projections of the photoelectron wave packets are measured by photoelectron imaging spectrometry [1]. In a first experiment an evolutionary algorithm is used to optimize the photoelectron distributions in order to match a predefined shape. The optimal photoelectron wave packet is analyzed employing a tomographic technique based on sequential measurement of projections from polarization shaped pulses rotated about the propagation axis [2]. This results in photoelectron angular distributions observed from different views. A tomography algorithm reveals the real 3-dimensional photoelectron angular distribution. The control mechanism of the atomic excitation is discussed by comparison of simulated results based on temporarily varying polarization states of the used laser light.
[1] M. Wollenhaupt et al., Appl. Phys. B 95: 245-259 (2009)
[2] M. Wollenhaupt et al., Appl. Phys. B 95: 647-651 (2009)