Generation of long plasma channels in air by focusing ultrashort laser pulses with an axicon

Abstract : We show that by focusing ultrashort-pulsed laser beams in air with an axicon, relatively long plasma channels can be generated. The axicon generates Bessel-like beams, where the on-axis intensity stays high over distances much longer compared to focusing with conventional lenses. We developed a scheme to detect the presence of the plasma, based on its screening property. Using this scheme, we detected plasma channels longer than 1 m and 3.5 m generated by 8 mJ and 90 mJ input pulse energies, respectively. Our simulations show that axicon focusing can yield self-guided propagation with or without contribution of plasma, depending on the input pulse power.
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https://hal-polytechnique.archives-ouvertes.fr/hal-00457961
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Submitted on : Thursday, February 18, 2010 - 7:16:56 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:02 AM

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Selcuk Akturk, Bing Zhou, Michel Franco, Arnaud Couairon, André Mysyrowicz. Generation of long plasma channels in air by focusing ultrashort laser pulses with an axicon. Optics Communications, Elsevier, 2009, 282 (1), pp.129. ⟨10.1016/j.optcom.2008.09.048⟩. ⟨hal-00457961⟩

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