Mehdi Etehadi Abari - Young Researchers and Elites Club, Science and Research Branch, Islamic Azad University, Tehran, Iran
Mahsa Sedaghat - Young Researchers and Elites Club, Science and Research Branch, Islamic Azad University, Tehran, Iran
Mohammad Taghi Hosseinnejad - Young Researchers and Elites Club, Science and Research Branch, Islamic Azad University, Tehran, Iran

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.

Laser plasma interaction Magnetized underdense plasma Variational principal approach method Laser spot size