Our use of a microphone array has enabled single-shot measurements of femtosecond filament longitudinal structure and energy deposition [1]. Here we study the effect of pulse duration on filament length and axial structure.
Femtosecond filaments deposit energy into air, leading to localized density depressions. We employ this effect with a multi-filamenting LG01 beam to generate long-lived air waveguides that guide high average power beams up to ~50m.
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