Filamentation in Kerr media from pulsed Bessel beams

Abstract : In contrast with filamentation of ultrashort laser pulses with standard Gaussian beams in Kerr media, three different types of Bessel filaments are obtained in air or in water by focusing ultrashort laser pulses with an axicon. We thoroughly investigate the different regimes and show that the beam reshapes as a nonlinear Bessel beam which establishes a conical energy flux from the low intensity tails toward the high intensity peak. This flux efficiently sustains a high contrast long-distance propagation and easily generates a continuous plasma channel in air.
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Submitted on : Monday, January 24, 2011 - 3:10:59 PM
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P. Polesana, Michel Franco, Arnaud Couairon, D. Faccio, P. Di Trapani. Filamentation in Kerr media from pulsed Bessel beams. Physical Review A, American Physical Society, 2008, 77 (4), pp.043814. ⟨10.1103/PhysRevA.77.043814⟩. ⟨hal-00558943⟩

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