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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 01, 2018
- Source ID
- 10.1063/1.5027573
Entities
People
- Danielle Reyes
- Martin Richardson
- Matthieu Baudelet
- Shermineh Rostami Fairchild
Organizations
- Army Research Office
- Florida Institute of Technology
- University of Central Florida
- University of Central Florida College of Sciences