Focusing short CO2 laser pulses into air reveals rich ionization physics that is best explained by solid-state theories and results in centimetre-scale-diameter megafilaments that transport joules of energy.
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Steinmeyer, G. Megafilaments in the mid-infrared. Nature Photon 13, 7–8 (2019). https://doi.org/10.1038/s41566-018-0329-7
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DOI: https://doi.org/10.1038/s41566-018-0329-7