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Longitudinal dependence of the charge collected from laser filaments in air, following the typical charge distribution in filaments. Error bars: one standard deviation over 150 measurements.
Power dependence of the charge collected in air with or without laser-droplet interaction. (a) Self-guided filaments generated by a slightly chirped pulse. (b) Focused beam . Error bars: one standard deviation over 500 measurements.
Chirp dependence of the charge emission by air and water droplets under illumination by strongly focused laser pulses of 24 mJ energy. Right scale: relative increase in the collected charge due to the laser-droplet interaction.
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