Propagation of Gaussian laser beam through magnetized cold plasma with increasing density ramp

Abstract

Propagation of Gaussian laser beam in magnetized cold plasma with upward increasing density ramp is investigated. The slowly increasing plasma density ramp profile n(ξ)=notan(ξ/d) is taken similar to Sadighi-Bonabi et al. [12]. Such density profile is quite useful in decreasing the beam width parameter which leads to strong self-focusing. Strong self-focusing is reported on account of combined role of plasma density ramp and magnetic field for extra ordinary mode than ordinary mode at optimized intensity (αoEoo2=0.6). The comparison has been reported both in the presence and absence of plasma density ramp at optimized magnetic field (ωc/ωo=0.3) and intensity (αoEoo2=0.6). The selection of proper density ramp and static magnetic field results in strong self-focusing which might be useful in various potential applications such as laser driven accelerators and ICF.