Transition From Linear- To Nonlinear-Focusing Regime Of Laser Filament Plasma Dynamics

Abstract

Laser filament properties, including the plasma induced by the filamenting pulse in the medium, depend on the numerical aperture (NA) of the focusing optics used to create them. Recent studies of this dependence have revealed two distinct linear and non-linear filamentation regimes. High-resolution spatial and temporal electron density measurements are presented demonstrating the transition from the linear to nonlinear focusing regime. This study shows that the dominance of geometrical focusing in the linear (high NA) regime produces plasma with high peak densities and large plasma diameters, while filamentation in the nonlinear regime, equivalent to long distance filamentation, leads to low peak densities and small plasma diameters.

Publication Date

8-7-2018

Publication Title

Journal of Applied Physics

Volume

124

Issue

5

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1063/1.5027573

Socpus ID

85051071722 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85051071722

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