TY - GEN
T1 - Modeling of air breakdown by single-mode and multi-mode lasers
AU - Alberti, Andrea
AU - Munafò, Alessandro
AU - Pantano, Carlos
AU - Freund, Jonathan B.
AU - Panesi, Marco
N1 - Publisher Copyright:
© 2019, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2019
Y1 - 2019
N2 - We present a physics-based non-equilibrium plasma model for Laser Induced Breakdown (LIB). Here, we consider the influence of mode-beating pulse on the plasma generation. The system of chemically reactive Navier-Stokes equations describes the hydrodynamics and non-equilibrium effects are accounted for by means of a two-temperature model for heavy-particles and free-electrons. The non-equilibrium radiation model is based on a kinetic approach for the photons (radiative transfer equation formulation). Inverse Bremsstrahlung, multiphoton ionization, chemical kinetics and shock wave dynamics are taken into account. Simulations were conducted in quiescent ambient air at atmospheric pressure. The computed absorbed energy is in good agreement with the experiments for both the single-mode and multi-mode laser operating configuration; the kernel formation and dynamics depends on the mode-beating pulse shape, as observed experimentally. The kernel structure for the multi-mode configuration appears periodic, with the distance between the scattered spots being a function of the modulating frequency.
AB - We present a physics-based non-equilibrium plasma model for Laser Induced Breakdown (LIB). Here, we consider the influence of mode-beating pulse on the plasma generation. The system of chemically reactive Navier-Stokes equations describes the hydrodynamics and non-equilibrium effects are accounted for by means of a two-temperature model for heavy-particles and free-electrons. The non-equilibrium radiation model is based on a kinetic approach for the photons (radiative transfer equation formulation). Inverse Bremsstrahlung, multiphoton ionization, chemical kinetics and shock wave dynamics are taken into account. Simulations were conducted in quiescent ambient air at atmospheric pressure. The computed absorbed energy is in good agreement with the experiments for both the single-mode and multi-mode laser operating configuration; the kernel formation and dynamics depends on the mode-beating pulse shape, as observed experimentally. The kernel structure for the multi-mode configuration appears periodic, with the distance between the scattered spots being a function of the modulating frequency.
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U2 - 10.2514/6.2019-1250
DO - 10.2514/6.2019-1250
M3 - Conference contribution
AN - SCOPUS:85083941629
SN - 9781624105784
T3 - AIAA Scitech 2019 Forum
BT - AIAA Scitech 2019 Forum
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - AIAA Scitech Forum, 2019
Y2 - 7 January 2019 through 11 January 2019
ER -