期刊
NATURE PHOTONICS
卷 13, 期 1, 页码 41-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41566-018-0315-0
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资金
- Air Force Office of Scientific Research [FA9550-16-1-0139 DEF, FA9550-16-1-0088, FA9550-15-1-0272]
- Office of Naval Research Multidisciplinary University Research Initiative (MURI) grant [N00014-17-1-2705]
- Department of Energy [DE-SC0010064]
The diffraction-compensated propagation of high-power laser beams in air could open up new opportunities for atmospheric applications such as remote stand-off detection, long-range projection of high-energy laser pulses and free-space communications. Here, we experimentally demonstrate that a self-guided terawatt picosecond CO2 laser beam forms in air a single centimetre-scale-diameter megafilament that, in comparison with a short-wavelength laser filament, has four orders of magnitude larger cross-section and guides many joules of pulse energy over multiple Rayleigh distances at a clamped intensity of similar to 10(12) W cm(-2). We discover that this megafilament arises from the balance between self- focusing, diffraction and defocusing caused by free carriers generated via many-body Coulomb-induced ionization that effectively decrease the molecular polarizability during the long-wavelength laser pulse. Modelling reveals that this guiding scheme may enable transport of high-power picosecond infrared pulses over many kilometres in the 8-14 mu m atmospheric transmission window.
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