Self-focusing of a high-intensity laser pulse by a magnetized plasma lens in sub-relativistic regime

Interaction of high power circularly polarizedshort laser pulses with a cold underdense magnetized thinplasma lens is analyzed in the sub-relativistic regime. Themagnetic field is applied along the direction of the laserfield propagation. The evolution equation of the beam spotsize is derived and solved by making use of the variationalprinciple approach method. The theoretical investigationsreveal that not only the magnetized plasma lens moresufficiently decreases the laser spot size, but also the lefthandedcircularly polarized beam is more effectivelyfocused by a magnetized plasma lens compared to theright-handed circularly polarized beam.