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The distant projection of high peak and average power laser beams in theatmosphere is a longstanding goal with a wide range of applications. Our earlyproof-of-principle experiments [Phys. Rev. X 4, 011027 (2014)] presented onesolution to this problem, employing the energy deposition of femtosecondfilaments in air to sculpt millisecond lifetime sub-meter length airwaveguides. Here, we demonstrate air waveguiding at the 50 meter scale, 60Xlonger, making many practical applications now possible. We employ a new methodfor filament energy deposition: multi-filamentation of Laguerre-Gaussian LG01"donut" modes. We first investigate the detailed physics of this scheme over ashorter 8 m in-lab propagation range corresponding to ~13 Rayleigh lengths ofthe guided pulse. We then use these results to demonstrate optical guiding over~45 m in the hallway adjacent to the lab, corresponding to ~70 Rayleighlengths. Injection of a continuous wave probe beam into these waveguidesdemonstrates very long lifetimes of tens of milliseconds.

Optical guiding in 50-meter-scale air waveguides