Figure 2
From: Dramatic enhancement of supercontinuum generation in elliptically-polarized laser filaments
Ellipticity dependence of filament plasma channel.
The experimentally measured intensity of the transverse plasma emission in N2 is plotted for various QWP angles, exhibiting an anomalous extension away from the focal lens when the QWP angle is set to 39 degrees, as indicated by the arrow. The length of the filament plasma channel (characterized by the distances at which the plasma emission intensity drops to 1/e2 of its maximal value) with the QWP angle set to 39 degrees (290 mm) is found to be more than 30% longer than for 45 degrees (220 mm) and more than 5% longer than for 0 degrees (270 mm).
