Large scale Tesla coil guided discharges initiated by femtosecond laser filamentation in air

The guiding of meter scale electric discharges produced in air by a Tesla coil is realized in laboratory using a focused terawatt laser pulse undergoing filamentation. The influence of the focus position, the laser arrival time, or the gap length is studied to determine the best conditions for efficient laser guiding. Discharge parameters such as delay, jitter, and resistance are characterized. An increase of the discharge length by a factor 5 has been achieved with the laser filaments, corresponding to a mean breakdown field of 2kV/cm for a 1.8m gap length. Consecutive guided discharges at a repetition rate of 10Hz are also reported.