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* Corresponding author 1 ENSTA ParisTech École polytechnique CNRS LOA-ILM - Interaction Laser-Matière ENSTA ParisTech École polytechnique CNRS LOA - Laboratoire d-optique appliquée 2 CELIA - Centre d-Etudes Lasers Intenses et Applications

Abstract : The relaxation of a plasma grating resulting from the interference of two crossing laser filaments in molecular and atomic gases is studied experimentally. Dissipation of the grating fringes is dominated by ambipolar diffusion in atomic gases and by a combination of ambipolar diffusion and collision-assisted free electron recombination in molecular gases. A theoretical model of the grating evolution is developed and compared to experimental results. Good agreement with simulations allows extracting plasma properties such as electron density, diffusion and recombination coefficients in Ne, Ar, Kr, Xe, N 2 , O 2 , CO 2 and air at atmospheric pressure.

Keywords : Non-linear optics filamentation plasma grating ambipolar diffusion recombination

Author: Amélie Jarnac - Magali Durand - Yi Liu - Bernard Prade - Aurélien Houard - Vladimir Tikhonchuk - André Mysyrowicz -



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