Abstract
We investigate the Autler-Townes splitting for Rydberg atoms dressed with linearly polarized microwave radiation, resonant with generic S 1 /2 <-> P 1 /2 and S 1 /2 <-> P 3 /2 transitions. The splitting is probed using laser light via electromagnetically induced transparency measurements, where the transmission of probe laser light reveals a two -peak pattern. In particular, this pattern is invariant under rotation of the microwave field polarization. In consequence, we establish S <-> P Rydberg transitions as ideally suited for polarization -insensitive electrometry, contrary to recent findings [A. Chopinaud and J. D. Pritchard, Phys. Rev. Appl. 16 , 024008 (2021)].