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A: Fachverband Atomphysik

A 38: Atomic Clusters IV

A 38.2: Vortrag

Freitag, 6. März 2009, 14:15–14:30, VMP 6 HS-C

Optimal Control of the Ionization of embedded Silver Clusters in Strong Femtosecond Laser Fields — •Nguyen Xuan Truong¹, Paul Hilse², Sebastian Göde¹, Andreas Przystawik¹, Tilo Döppner¹, Thomas Fennel¹, Thomas Bornath¹, Josef Tiggesbäumker¹, Manfred Schlanges², Gustav Gerber³, and Karl Heinz Meiwes-Broer¹ — ¹Institut für Physik, Universität Rostock, D-18051 Rostock — ²Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, D-17489 Greifswald — ³Physikalisches Institut, Universität Würzburg, D-97074 Würzburg

Optimal control techniques combined with femtosecond laser pulse shaping are applied to enhance the strong-field induced emission of highly charged atomic ions from silver clusters isolated in helium nanodroplets. We report on a substantial increase of the yield of Ag^z+ (z≥10) with the optmized pulses when comparing to single bandwidth-limited or down-chirped pulses at constant fluence. A remarkable simple double-pulse structure containing a low-intensity pre-pulse and a stronger post-pulse turns out to produce the highest atomic charge states up to z=20. A numerical control experiment based on a modified version of the nanoplasma model converge to a similar pulse envelope, underlining the leading role of plasmons in the generation of highly charged ions from intense laser-cluster interaction.