Abstract
Radio frequency (RF) electromagnetic radiation over range of 30∼800 MHz from laser induced breakdown of air are investigated. The RF radiation, under different laser energies, laser polarization directions and detect position are measured. It is found that a much stronger RF signals emitted from air plasma was observed at moderate laser pulse energy in our case. The measured RF signal of air plasma is found to depend on laser polarization direction and pulse energy, and the spatial distribution of RF radiation is anisotropy. Underlying physics responsible for laser parameter-dependent RF emission, rich in emission lines and anisotropy of spatial distribution of RF emission of the laser induced air plasma are discussed.
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