Mainz 2017 – scientific programme

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A: Fachverband Atomphysik

A 22: Attosecond Science

A 22.7: Talk

Wednesday, March 8, 2017, 16:15–16:30, N 2

The ion microscope as a tool for quantitative measurements in the extreme ultraviolet — •Nikolaos Tsatrafyllis^1,2, Boris Bergues³, Hartmut Schröder³, László Veisz^3,4, Emmanouil Skantzakis¹, David Gray¹, Bálazs Bodi^1,5, Sergei Kühn⁶, George Tsakiris³, Dimitris Charalambidis^1,2,6, and Paraskevas Tzallas^1,6 — ¹Foundation for Research and Technology - Hellas, Institute of Electronic Structure & Laser, Heraklion (Crete), Greece — ²Department of Physics, University of Crete, Heraklion (Crete), Greece — ³Max-Planck-Institut für Quantenoptik, Garching, Germany — ⁴Department of Physics, Umea University, Umeå, Sweden — ⁵Wigner Research Center for Physics, Budapest, Hungary — ⁶ELI Attosecond Light Pulse Source, Szeged, Hungary

We demonstrate a tool for quantitative measurements in the extreme ultraviolet (EUV) spectral region measuring spatially resolved atomic ionization products at the focus of an EUV beam. The ionizing radiation is a comb of the 11th-15th harmonics of a Ti:Sapphire femtosecond laser beam produced in a Xenon gas jet. The spatial ion distribution at the focus of the harmonics is recorded using an ion microscope. Spatially resolved single- and two-photon ionization products of Argon and Helium are observed. From such ion distributions single- and two-photon generalized cross sections can be extracted by a self-calibrating method. The observation of spatially resolved two-EUV-photon ionization constitutes an initial step towards future single-shot temporal characterization of attosecond pulses.