A tunable atomic line filter without sacrificing transmission based on the combination of selective pump and magnetic field

Abstract

This paper presents a theoretical model of an atomic line filter based on optical anisotropy which is induced by the combination of the selective pump and an external magnetic field. By analyzing the pumping process, we carefully elucidated the influence of the selective pump and magnetic field on the pumping process, and furthermore on the tunability and peak transmission of the filter. Different from the previously reported filter, our numerical results suggest that this type of filter has a large-scale tunability at the transmission peak position without sacrificing transmission, which is very important in free-space optical communication and lidar systems subjected to large Doppler shift.