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Long-range third-harmonic generation in air using ultrashort intense laser pulses

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6 Author(s)
Theberge, F. ; Centre d’Optique, Photonique et Laser and Département de Physique, de Génie Physique et d’Optique, Université Laval, Québec G1K 7P4, Canada ; Luo, Q. ; Liu, W. ; Hosseini, S.A.
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The generation of a powerful third-harmonic pulse in atmospheric air has been controlled over long-distance propagation using divergent and negatively chirped fundamental pulses. The cofilamentation of the high-intensity fundamental and third-harmonic pulses was observed over long propagation distance using the Lidar technique. The high peak intensity and the extremely broad spectral content generated by both fundamental and third-harmonic pulses imply promising applications for atmospheric remote sensing of pollutants and bioaerosols.

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Applied Physics Letters  (Volume:87 ,  Issue: 8 )