Revival of femtosecond laser plasma filaments in air by a nanosecond laser

Abstract : Short lived plasma channels generated through filamentation of femtosecond laser pulses in air can be revived after several milliseconds by a delayed nanosecond pulse. Electrons initially ionized from oxygen molecules and subsequently captured by neutral oxygen molecules provide the long-lived reservoir of low affinity allowing this process. A Bessel-like nanosecond-duration laser beam can easily detach these weakly bound electrons and multiply them in an avalanche process. We have experimentally demonstrated such revivals over a channel length of 50 cm by focusing the nanosecond laser with an axicon.
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Submitted on : Friday, March 12, 2010 - 7:53:42 PM
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Bing Zhou, Selcuk Akturk, Bernard Prade, Yves-Bernard André, Aurélien Houard, et al.. Revival of femtosecond laser plasma filaments in air by a nanosecond laser. Optics Express, Optical Society of America, 2009, 17 (14), pp.11450. ⟨10.1364/OE.17.011450⟩. ⟨hal-00457966⟩

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