Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 23: Poster: Atomic clusters (with MO)
A 23.2: Poster
Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais
Setup and characterisation of a THz-radiation source for a field-driven streaking experiment with rare gas clusters — •Jan Lahl1, Bernd Schütte2, Tim Oelze1, Arnaud Rouzée2, Marc Vrakking2, and Maria Krikunova1 — 1TU Berlin, Institut für Optik und Atomare Physik, Berlin, Germany — 2Max-Born Institut, Berlin, Germany
Novel light sources like high harmonics generation have triggered a wide range of experiments for studies of light-matter interaction. We are especially interested in electron dynamics in rare gas clusters initiated by extreme-ultraviolet pulses. A field-driven streak camera maps the temporal structure of the electron wave packet into a momentum distribution which can by experimentally measured. For the dynamics on a fs-timescale electric field oscillation periods in sub-ps range (THz frequency) are required. The THz radiation is generated in a LiNbO3 crystal based on optical rectification using near-infrared (NIR) fs-pulses. To meet the phase-matching condition the NIR pulse fronts are tilted by a diffraction grating. Characterisation of the THz is accomplished by electro-optic sampling in a ZnTe crystal. The intensity distribution of a beforehand splitted part of the same NIR beam is analysed with respect to the direction of its polarisation after passing the crystal. Due to its high intensity the THz radiation alters the polarisation of the crystal non-linearly which results in a deviation of the measured intensity distribution. The setup of the THz source will be shown as well as results of the characterisation. An outlook on the intended application in the streaking experiment will be presented.