Investigation of a gas breakdown process in a laser-plasma experiment

This paper is mainly concerned with Nd:YAG laser induced plasmas in air at different pressures. A modelling of the formation of laser plasmas is presented. The preionization phase is described using time differential equations that are solved in the basis of the Crank-Nicolson second order scheme. M...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2004-10, Vol.37 (19), p.2686-2702
Main Authors: Soubacq, S, Pignolet, P, Schall, E, Batina, J
Format: Article
Language:English
Subjects:
Exact sciences and technology
Laser-plasma interactions
Optical (ultraviolet, visible, infrared) measurements
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma diagnostic techniques and instrumentation
Plasma production and heating
Plasma production and heating by laser beams
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Summary:This paper is mainly concerned with Nd:YAG laser induced plasmas in air at different pressures. A modelling of the formation of laser plasmas is presented. The preionization phase is described using time differential equations that are solved in the basis of the Crank-Nicolson second order scheme. Moreover, the following dynamic phase, described as a strong shock wave expanding out of the focal volume, is simulated by using a two-dimensional compressible flow calculation code. The evolution of pressure, temperature, densities and velocities are analysed and compared with experimental measurements. The mean electron density of the plasma measured through an interferometric method leads to ( ), which correlates with computed results.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/37/19/012