RESILIENT GAUSSIAN SELF-FOCUSED LASER-BEAM IN THE MANIFESTATION OF THE UPWARD PLASMA-DENSITY RAMP

Abstract

This paper describes a Gaussian laser-beam's strong self-focusing scheme. In a plasma is added
upward plasma-density ramp. To derive the differential equation that determines the progress of
the spot size of the laser-beam with the propagation length, paraxial theory in the WKB
approximation has been used. According to the laser parameters, for example, initial laser-beam
length, initial laser-beam strength and plasma-density, a careful analysis is carried out on
strong self-focusing. The results obtained numerically mean that the self-focusing is better with
an increase in laser-beam initial spot width. In addition, the presence of an upward plasmadensity ramp within the plasma-charged cone lead to a decrease in the laser-beam spot size
resulting in a better self-focus