Collisionless energy absorption in the short-pulse intense laser-cluster interaction

Details Collisionless energy absorption in the short-pulse intense laser-cluster interaction Collisionless energy absorption in the short-pulse intense laser-cluster interaction

2006-07-21

arxiv.org/abs/physics/0607185v1

Physics

Atomic and Molecular Clusters

12 pages, 13 figures, RevTeX4

Scientific paper

10.1103/PhysRevA.74.063202

In a previous Letter [Phys. Rev. Lett. 96, 123401 (2006)] we have shown by means of three-dimensional particle-in-cell simulations and a simple rigid-sphere model that nonlinear resonance absorption is the dominant collisionless absorption mechanism in the intense, short-pulse laser cluster interaction. In this paper we present a more detailed account of the matter. In particular we show that the absorption efficiency is almost independent of the laser polarization. In the rigid-sphere model, the absorbed energy increases by many orders of magnitude at a certain threshold laser intensity. The particle-in-cell results display maximum fractional absorption around the same intensity. We calculate the threshold intensity and show that it is underestimated by the common over-barrier ionization estimate.

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