Hannover 2020 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 16: Interaction with strong or short laser pulses I
A 16.8: Vortrag
Mittwoch, 11. März 2020, 13:00–13:15, a320
Controlling collective enhancement of above threshold ionization by resonantly exciting helium droplets — •Rupert Michiels1, Mahmoud Abu-samha2, Lars Bojer Madsen3, Ulrich Bangert1, Marcel Binz1, Lukas Bruder1, Carlo Callegari4, Rowan Duim1, Raimund Feifel5, Michele Di Fraia4, Aaron Cristopher LaForge6, Paolo Piseri7, Oksana Plekan4, Kevin Charles Prince4, Richard James Squibb5, Stefano Stranges8, Daniel Uhl1, Andreas Wituschek1, Marcel Mudrich3, and Frank Stienkemeier1 — 1University of Freiburg, Germany — 2American University of the Middle East, Kuwait — 3Aarhus University, Denmark — 4Elettra-Sincrotrone Trieste, Italy — 5University of Gothenburg, Sweden — 6University of Connecticut, USA — 7Università degli Studi die Milano, Italy — 8University Sapienza Rome, Italy
Condensed matter, especially clusters and nanodroplets, holds the promise of enhancing high-order nonlinear optical effects due to their high local density. Here, we report on the observation of enhanced intensity from the emission of above threshold photoelectrons (ATI). ATI electrons are created by ionizing multiply excited helium nanodroplets in the 1s4p state using 400 nm laser radiation. The intensity of high-order ATI electrons is shown to be enhanced by several orders of magnitude when compared to excited helium in the gasphase. Furthermore, we show that the strength of the ATI enhancement can be tuned by changing the total number of excited atoms in the droplet.