抄録
Electrical discharge guided by a 100J/2GW pulse CO2 laser is reviewed. A long air break-down plasma channel is produced by using a Multi-Active CHannel (MACH) focusing mirror which has two focal lengthes. The plasma channel has been used to guide electrical discharge over a distance of 6m in laboratory air at an applied potential of-1.2MV. A successive plasma channel produced by the laser is more effective for discharge guiding than the chains of break plasma beads. A stepped leader was obserbed with a streak camera for laser guided discharge. The mean propagation velocity of the stepped leader was 105-106m/s.
