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We investigate the triggering and guiding of DC high-voltage discharges overa distance of 37 cm by filaments produced by ultraviolet (266 nm) laser pulsesof 200 ps duration. The latter reduce the breakdown electric field by half andallow up to 80% discharge probability in an electric field of 920 kV/m. Thishigh efficiency is not further increased by adding nanosecond pulses in theJoule range at 532 nm and 1064 nm. However, the latter statistically increasesthe guiding length, thereby accelerating the discharge by a factor of 2. Thiseffect is due both to photodetachment and to the heating of the plasma channel,that increases the efficiency of avalanche ionization and reduces electronattachment and recombination.

HV discharge acceleration by sequences of UV laser filaments with visible and near-infrared pulses