Fig. 3: Pointing stability of the forward SC laser and filament as a function of the applied high voltage.

a SDEVs of the forward SC laser and filament pointing angles at 1 kHz. SDEVs of the scattering angles of forward SC light (b) and filament (c) under different laser repetition rates. Solid lines in (c) are fits for guiding the eyes. d Simulated result of the effective electric field applied on the filament as the voltage increasing