抄録
A possibility of triggering lightning using laser is investigated. A long plasma channel is produced in atmospheric air when pulsed CO2 laser radiation is focused by a mirror. Length of plasma channels are measured for focal length of 10m, 20m, 30m, 45m and 60m respectively. A length of 30m plasma channel is produced when a energy. of 50 J unstable mode is focused by the mirror having 60m focal length. The propagated unstable mode patterns and intensities are calculated using the Fresnel diffraction integral, and compared with experimental results.
The plasma channel produced by the mirror of 10m focal length is applied for triggering electrical discharge. The arc which has the length of 1.8m is triggered and guided by the plasma channel, and some characteristics are obtained.
