Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 27: Poster: Photoionization

A 27.8: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

Dynamical Asymmetries of Electron Emission in CEP stable and two-color fields — •Martin Laux, Marcus Held, Yonghao Mi, Christian Ott, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

Photoelectron emission asymmetry in strong-field atomic photoionization plays a key role for the understanding of light-matter interaction in general. These asymmetries are caused by the spatial symmetry breaking within the laser pulse, as it happens e.g. in a few-cycle pulse with a fixed carrier-envelope phase (CEP). Another way to create an asymmetric laser field even for longer pulses is the superposition of a pulse with its second harmonic. Tuning the delay between the two colors or varying the CEP affects the asymmetry of photoelectron emission, but in qualitatively different fashions as confirmed by model calculations. A monolithic, robust, and phase-stable setup to create second harmonic light and allowing the continuous adjustment of the relative phase between the fundamental 800 nm and the frequency-doubled 400 nm pulses will be presented. Such dynamical two-color pulses are used for the study of dynamical asymmetry effects in photoionization of atoms and simple molecules with a reaction microscope.