"Sub cycle non-sequential double ionization and excitation processes of xenon with polarization gated pulses"

  • Date: Dec 16, 2013
  • Time: 12:30 PM - 12:30 PM (Local Time Germany)
  • Speaker: Professor Bernd Witzel, Université Laval, Canada: Centre d´optique, photonique et laser (COPL); Department of Physics, Engineering Physics and Optics
  • Room: Herbert Walther Lecture Hall
  • Host: MPQ
"We have studied short pulse laser ionization (< 7 fs, 750 nm) and excitation with polarization-gated laser pulses. The laser pulse used is composed of a circular section at the beginning and the end of the pulse and an experimentally-defined linearly polarized central part. Due to quantum mechanics selection rules (Dm ±1), multiphoton excitation of Rydberg states with high angular momentum are only possible with linearly polarized light. We show that polarization gating allows us to study excitation and ionization with quasi sub-cycle laser pulses. The method allows us to determine the shortest temporal window needed for the excitation processes. We have used polarization gated pulses to measure non-sequential ionization as a function of the gate duration."
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