Optimizing the ionization and energy absorption of laser-irradiated clusters

Details Optimizing the ionization and energy absorption of laser-irradiated clusters Optimizing the ionization and energy absorption of laser-irradiated clusters

2008-01-08

arxiv.org/abs/0801.1231v1

Physics

Plasma Physics

10 page, 8 figures, RevTeX

Scientific paper

10.1063/1.2896578

It is known that rare-gas or metal clusters absorb incident laser energy very efficiently. However, due to the intricate dependencies on all the laser and cluster parameters it is difficult to predict under which circumstances ionization and energy absorption is optimal. With the help of three-dimensional particle-in-cell simulations of xenon clusters (up to 17256 atoms) we find that for a given laser pulse energy and cluster an optimum wavelength exists which corresponds to the approximate wavelength of the transient, linear Mie-resonance of the ionizing cluster at an early stage of negligible expansion. In a single ultrashort laser pulse, the linear resonance at this optimum wavelength yields much higher absorption efficiency than in the conventional, dual-pulse pump-probe set-up of linear resonance during cluster expansion.

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