Light-shift effects in a double-resonance magnetometer using a single elliptically polarized beam

In this study, we investigate a compact double-resonance scalar magnetometer employing a single detuned elliptically polarized laser beam. A multipass cavity is incorporated to enhance the Faraday rotation signal. We observe asymmetric atomic response line shapes and resonance frequency shifts under non-collimated beam propagation through the vapor cell, and attribute these effects to light shifts. Experimental measurements of these light-shift effects are presented and show agreements with numerical simulations. Moreover, we demonstrate that this light shift can be significantly suppressed using a compensation method developed in our earlier work.