Hamburg 2009 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 49: Ultrakurze Pulse: Anwendungen II
Q 49.1: Vortrag
Donnerstag, 5. März 2009, 14:00–14:15, VMP 6 HS-A
Measurement and Optimization of Isolated Attosecond Pulse Contrast for Optical Streaking in Molecules — •Thomas Pfeifer1,2, Mark J. Abel1, Phillip M. Nagel1, Willem Boutu1, M. Justine Bell1, Daniel M. Neumark1, and Stephen R. Leone1 — 1University of California, Berkeley & Lawrence Berkeley National Lab, USA — 2Max-Planck-Institut für Kernphysik, Heidelberg, Deuschland
A fast and efficient method to measure the contrast of an isolated attosecond pulse, defined as the ratio between the energy in the main pulse and the energy in the satellite pulses in the neighboring half-cycles, is presented. The method is based on scanning the carrier-envelope phase (CEP) of a few-cycle high-harmonic driver pulse and measuring the photoelectron spectra produced by the combined action of the attosecond pulses and strong-field visible laser pulse in a second interaction region as a function of the CEP but at constant time delay. The data can then be used to immediately determine the contrast as a function of CEP and thus to find the particular CEP value that produces the maximal contrast, which is of major importance for attosecond experiments. We used the optimized isolated attosecond pulses for performing cycle-resolved optical streak-field measurements in molecules (SF6, N2).