Hannover 2016 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 11: Posters 2: Novelties in Molecular Physics: Femtosecond Spectroscopy, Quantum Control, Electronic Spectroscopy, Biomolecules and Photochemistry

MO 11.6: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

Robust control of molecular excitation using GDD-TOD-shaped femtosecond laser pulses — •Hendrike Braun¹, Tim Bayer², Cristian Sarpe¹, Matthias Wollenhaupt², and Thomas Baumert¹ — ¹Universität Kassel, Institut für Physik und CINSaT, 34132 Kassel, Germany — ²Carl von Ossietzky Universität Oldenburg, Institut für Physik, 26129 Oldenburg, Germany

We report on adiabatic population control in molecules using intense shaped femtosecond laser pulses. The laser pulses employed are spectrally phase-shaped using a combination of second and third order dispersion [1]. The resulting pulses offer a variety of different temporal amplitude and phase shapes to optimally adapt to the laser-induced intramolecular excitation dynamics [2,3]. Third order dispersion (TOD) results in temporally asymmetric pulses featuring gentle slopes as well as rapidly varying amplitude profiles. Group delay dispersion (GDD) provides time-dependent frequency sweeps being essential for adiabatic control scenarios [4]. In our experiments we investigate the interaction of GDD-TOD-shaped pulses with potassium molecules serving as a prototype system for coherent control scenarios. We support our experimental studies by quantum dynamics simulations in order to model the interaction processes and extract the quantum control mechanisms at play.

[1] J. Schneider et al., Phys. Chem. Chem. Phys. 13, 8733 (2011)

[2] H. Braun et al., J. Phys. B 47, 124015 (2014)

[3] T. Bayer et al., Adv. Chem. Physics, accepted

[4] N. Vitanov et al., Annu. Rev. Phys. Chem. 52, 763 (2001)