Double-resonance frequency shift in a hydrogen maser - art. no. 063405

We use the dressed-atom formalism to calculate the frequency shift in a hyd rogen maser induced by applied radiation near the Zeeman frequency, and fin d excellent agreement with a previous calculation made in the bare-atom bas is. The maser oscillates on the DeltaF=1, Deltam(F),=0 hyperfine transition , while the applied field is swept through the F=1, Deltam(F)=+/-1 Zeeman r esonance. We determine the effect of die applied field on the Zeeman levels using the dressed-atom picture, and then calculate the maser frequency shi ft by coupling the dressed states to the microwave cavity. Qualitatively, t he dressed-atom analysis gives a simpler physical interpretation of this do uble-resonance process, which has applications in precision hydrogen Zeeman spectroscopy, e.g., in fundamental symmetry tests.