Polarization responses of generated vector beam in a magnetic-driven atomic system

Abstract

In this paper, the double-V atomic system that split under a magnetic field is manipulated by helical Ince-Gaussian (HIG) beams with opposite orbital angular momentum (OAM). With the controlling of HIG beams, the atomic vapor acts as a spatially varying circular birefringent medium, whose optical response to external magnetic fields is emphatically discussed. Results show that, the polarization properties of the probe field have a linear variation with the weak magnetic field, which provides a method to measure the slight change in the external magnetic field. It is also demonstrated that the polarization separation of the probe field can be realized by manipulating the magnitude or direction of the magnetic field. The dynamic polarization of the probe field in this work is expected to have potential applications in magnetic detection.