Abstract
We report on the first detailed measurements of ion energy distributions from microdroplet targets under ultrashort (100 fs), intense (10(16) Wcm(-2)) laser irradiation. Protons with kinetic energies of up to 20 keV are produced in a strongly anisotropic microexplosion. Modeling of the incident electromagnetic field indicates strong spatial variations over the surface of the microdroplet. Detailed numerical modeling shows that nonuniform heating on a submicron scale causes temperature inhomogeneities and nonradial pressure gradients, which drive an energetic nonspherical expansion.
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