Numerical calculation of atmospheric breakdown threshold induced by laser

In order to get the plasma in air for aircraft stealth, this paper calculates the breakdown threshold of atmosphere from semi-classic theory. The main subjects include the connection between the breakdown threshold and atmosphere pressure, and the connection between the breakdown threshold and laser duration. At the same time, the paper has a keen study on the breakdown time of different laser intensity. Besides, the discussion on the effect of initial electron in air is also included in all above analysis, the data indicate that under the influence of the electron, the threshold for long wavelength incident laser falls distinctly, but there is not any change for short wavelength laser (0.355 μm).