Background reservoir: its crucial role for long-distance propagation of femtosecond laser pulses in air
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- Liu, W., Gravel, JF., Théberge, F. et al. Appl. Phys. B (2005) 80: 857. doi:10.1007/s00340-005-1805-6
We report an experiment to demonstrate the crucial effect of the so-called background reservoir during the propagation of femtosecond laser pulses in air. The background reservoir was blocked by allowing only the filament to pass through a pinhole generated by the filament itself in an aluminum foil. We observed that the filamentation process is terminated immediately after the pinhole. Consequently, to achieve long-range filamentation, it is necessary to maintain the dynamic energy exchange between the reservoir and the self-foci.