Abstract
Investigations of a spatial density distribution at the focus of an intense picosecond Nd:YAG laser pulse ( λ=1064 nm) near a metallic target in air have been performed by interferometry and absorption photography with high temporal and spatial resolution (50 ps, <1 μm). An effect of microchanneling and an intense shock-wave formation in laser-produced plasma were observed. Estimations show that the current density in the microchannel is of the order of 10 10 A/cm 2, followed by the generation of a self-magnetic field in the narrow channel having a magnitude of 7 MG. When the power density of laser radiation was reduced to a value of the order of 9×10 9 W/cm 2 a significant change in electron density distribution has been estimated: a shock wave with a strong boundary front vanished, an electron density failed under the value of the order of 10 18 cm −3.
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