Figure 4
From: Dramatic enhancement of supercontinuum generation in elliptically-polarized laser filaments
Dependence of the on axis intensity, electron density and supercontinuum generation on propagation and initial ellipticity.
(a) Simulated peak intensity and (b) on axis electron density for initial polarizations of εin ≈ 0.4 (blue) εin ≈ 0.7 (green) and εin ≈ 1 (red), in Nitrogen. The distance 
is measured from the focusing lens, with the geometrical focus located at 
cm. (c) Time-dependent intensities of right- (solid lines) and left-handed (dashed lines) circular polarization components for input ellipticities of 
0.4, 0.7 and 1. 0 at 
Strong self-steepening is observed for 
. (d) Evolution of the supercontinuum power spectral density (PSD) with propagation distance. At the location of the second nonlinear focus (
), a large shift of the spectrum to higher frequencies is observed.
