TY - GEN
T1 - Refractive Index Modification Induced by Femtosecond Laser Filament
AU - Pokharel, Sagar
AU - Dogariu, Arthur
AU - Miles, Richard
AU - Tropina, Albina
N1 - Publisher Copyright:
© 2024 by Sagar Pokharel, Arthur Dogariu, Richard Miles, and Albina Tropina. Published by the American Institute of Aeronautics and Astronautics, Inc.
PY - 2024
Y1 - 2024
N2 - A self-consistent, multi-dimensional three-temperature plasma model for laser-induced nonequilibrium plasma is integrated with a semi-classical model for refractive index calculations to explore refractive index modifications in femtosecond laser-induced filaments. The investigation focuses on single filaments in nitrogen at atmospheric pressure, presenting a detailed analysis of the spatiotemporal evolution of the refractive index field during the filament’s decay. The fast temporal evolution in the refractive index at early times results from the exponential decay nature of electron density. Equally important factors include the dissociation and vibrational excitation of molecular nitrogen. A comprehensive analysis of the relative contributions to the refractive index among different components depends on the initial electron density, dissociation fraction, electron temperature, and the relaxation of electron energy to vibrational states. A thorough analysis is presented, spanning a range of plasma parameters, providing a quantitative understanding of the impact of thermodynamic nonequilibrium, dissociation, and hydrodynamic effects.
AB - A self-consistent, multi-dimensional three-temperature plasma model for laser-induced nonequilibrium plasma is integrated with a semi-classical model for refractive index calculations to explore refractive index modifications in femtosecond laser-induced filaments. The investigation focuses on single filaments in nitrogen at atmospheric pressure, presenting a detailed analysis of the spatiotemporal evolution of the refractive index field during the filament’s decay. The fast temporal evolution in the refractive index at early times results from the exponential decay nature of electron density. Equally important factors include the dissociation and vibrational excitation of molecular nitrogen. A comprehensive analysis of the relative contributions to the refractive index among different components depends on the initial electron density, dissociation fraction, electron temperature, and the relaxation of electron energy to vibrational states. A thorough analysis is presented, spanning a range of plasma parameters, providing a quantitative understanding of the impact of thermodynamic nonequilibrium, dissociation, and hydrodynamic effects.
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U2 - 10.2514/6.2024-2603
DO - 10.2514/6.2024-2603
M3 - Conference contribution
AN - SCOPUS:85195516735
SN - 9781624107115
T3 - AIAA SciTech Forum and Exposition, 2024
BT - AIAA SciTech Forum and Exposition, 2024
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - AIAA SciTech Forum and Exposition, 2024
Y2 - 8 January 2024 through 12 January 2024
ER -