Plasma dynamics of a laser filamentation-guided spark

Guillaume Point 1, 2, * Leonid Arantchouk 3, 2 Jérôme Carbonnel 2 André Mysyrowicz 2 Aurélien Houard 2
* Corresponding author
1 ONERA - The French Aerospace Lab [Palaiseau]
2 ILM - Interaction Laser-Matière
LOA - Laboratoire d'optique appliquée
3 LPP - Laboratoire de Physique des Plasmas
Abstract : We investigate experimentally the plasma dynamics of a centimeter-scale, laser filamentation-guided spark discharge. Using electrical and optical diagnostics to study monopolar discharges with varying current pulses we show that plasma decay is dominated by free electron recombination if the current decay time is shorter than the recombination characteristic time. In the opposite case, the plasma electron density closely follows the current evolution. We demonstrate that this criterion holds true in the case of damped AC sparks, and that alternative current is the best option to achieve a long plasma lifetime for a given peak current.
Keywords : nonlinear optics filamentation plasma discharge spark laser
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Submitted on : Friday, October 21, 2016 - 3:35:28 PM
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Guillaume Point, Leonid Arantchouk, Jérôme Carbonnel, André Mysyrowicz, Aurélien Houard. Plasma dynamics of a laser filamentation-guided spark. Physics of Plasmas, American Institute of Physics, 2016, 23 (9), pp.093505. ⟨10.1063/1.4962517⟩. ⟨hal-01385550⟩

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