Physics – Atomic and Molecular Clusters
Scientific paper
2009-09-21
Phys. Rev. A 81:013201, 2010
Physics
Atomic and Molecular Clusters
7 pages, 5 figures, text revised
Scientific paper
10.1103/PhysRevA.81.013201
Optimal control techniques combined with femtosecond laser pulse shaping are applied to steer and enhance the strong-field induced emission of highly charged atomic ions from silver clusters embedded in helium nanodroplets. With light fields shaped in amplitude and phase we observe a substantial increase of the Ag$^{q+}$ yield for $q>10$ when compared to bandwidth-limited and optimally stretched pulses. A remarkably simple double-pulse structure, containing a low-intensity prepulse and a stronger main pulse, turns out to produce the highest atomic charge states up to Ag$^{20+}$. A negative chirp during the main pulse hints at dynamic frequency locking to the cluster plasmon. A numerical optimal control study on pure silver clusters with a nanoplasma model converges to a similar pulse structure and corroborates, that the optimal light field adapts to the resonant excitation of cluster surface plasmons for efficient ionization.
Bornath Th
Döppner Tilo
Fennel Th.
G/"ode S.
Gerber G.
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