Double resonance frequency shift in a hydrogen maser
M. A. Humphrey, D. F. Phillips, R. L. Walsworth
Abstract
We use the dressed atom formalism to calculate the frequency shift in a hydrogen maser induced by applied radiation near the Zeeman frequency, and find excellent agreement with a previous calculation made in the bare atom basis. The maser oscillates on the DeltaF = 1, DeltamF = 0 hyperfine transition, while the applied field is swept through the F = 1, DeltamF = 1 Zeeman resonance. We determine the effect of the applied field on the Zeeman levels using the dressed atom picture, and then calculate the maser frequency shift by coupling the dressed states to the microwave cavity. Qualitatively, the dressed-atom analysis gives a new and simpler physical interpretation of this double resonance process, which has applications in precision hydrogen Zeeman spectroscopy, e.g., in fundamental symmetry tests.
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