Abstract
The excitation of the electric and self-generated magnetic field by pondermotive force during propagation of 100 ps laser pulse in air are investigated experimentally. Measurements of electron density distribution with high temporal (100 ps) and spatial resolution (<1 μm) by interferometry and absorption photography are presented. It is shown that under certain conditions a hollow current channel can be generated. The azimuthal magnetic field in the micro-channel was determined by Faraday rotation of a probing laser beam to 7.6 MG. The charged partical densities in channel exceed 6⋅1020 cm−3. Ion acceleration in a pinched annular current channel up to 6 MeV analogous to a micro-“plasma focus” conditions may be realized just at length of 100 μm.
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