Abstract
Empirical relationships for the velocity of laser-driven flyer plates versus radiant exposure have been found for a number of single layer and multiple layer thin (<4 μm) film targets. Single layer Al and multiple layer targets were evaluated with an optical time-of-arrival (TOA) technique for measuring flyer plate velocity. The materials employed in the multiple layer targets included metallic layers of Al, Mg, and Cu and dielectric layers of Al2O3, MgF2, and ZnS. The TOA velocity measurements were compared for various target constructions. Choice of layer thickness for the targets was based on the laser Gurney model. It was found that Mg/MgF2/Cu and Al/Al2O3 multiple layer targets were the most efficient, producing flyer plate velocities of about 4.4 mm/μs and 3.6 mm/μs, respectively, for a radiant exposure of approximately 15 J/cm2. For some multiple layer targets, dielectric failure was detected as the radiant exposure level was increased. Flyer plate breakup was also detected for some of the multiple layer targets.
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