  We present results of stroboscopic microwave spectroscopy of radio-frequency
dressed optically pumped magnetometer. Interaction between radio-frequency
dressed atoms and a synchronously pulsed microwave field followed by Voigt
effect-based optical probing allows us to perform partial state tomography and
assess the efficiency of the state preparation process. To theoretically
describe the system, we solve the dynamical equation of the density matrix
employing Floquet expansion. Our theoretical results are in good agreement with
experimental measurements over a wide range of parameters and pumping
conditions. Finally, the theoretical and experimental analysis presented in
this work can be generalised to other systems involving complex state
preparation techniques.
