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

Interaction of high power circularly polarized short laser pulses with a cold underdense magnetized thin plasma lens is analyzed in the sub-relativistic regime. The magnetic field is applied along the direction of the laser field propagation. The evolution equation of the beam spot size is derived and solved by making use of the variational principle approach method. The theoretical investigations reveal that not only the magnetized plasma lens more sufficiently decreases the laser spot size, but also the lefthanded circularly polarized beam is more effectively focused by a magnetized plasma lens compared to the right-handed circularly polarized beam.