Atomic Stabilization of Electromagnetic Field Strength Using Rabi Resonances

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Abstract
For nearly fifty years, atomic resonances have been employed to stabilize electromagnetic field frequency. Here, a dynamical Rabi resonance, associated with an alkali atom's ground state hyperfine transition, is used to stabilize electromagnetic field strength: A 7% sinusoidal variation was superimposed on a microwave field's strength, and through atomic stabilization this variation was reduced to 0.1%. Although the method is demonstrated with microwave fields, the technique could also be employed to stabilize optical fields via Rabi resonances associated with electronic transitions in atoms or molecules.

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