Explosion and Dynamic Transparency of Low-Density Structured Polymeric Targets Irradiated by a Long-Pulse KrF Laser

The hydrodynamics of plasma formed in the interaction 100 ns UV KrF laser pulses with foam targets volume densities from 5 to 500 mg/cm3 was studied. Initial and dynamic transmittance at 248 nm wavelength were measured. At intensities about 1012 W/cm2, propagation rates radiation through reached 80 km/s, while stream velocities both front rear sides approximately same, ~ 75 which confirms a volumetric absorption within target thickness explosive nature formation expansion.