Faraday-Ramsey rotation measurement in a thin cell as an analogy to an atomic beam

Atomic beams offer measurement capabilities for hot vapors but often require complex, bulky systems, limiting miniaturization. This study explores hot vapors in thin cells (L=30,5 μm) as a simplified analogy to atomic beams. Coherence is maintained only for atoms moving parallel to the cell walls, as wall collisions randomize spin. By filtering non-parallel atoms, we mimic atomic beam behavior and observe the Faraday-Ramsey effect. Rubidium atoms are optically pumped with linearly polarized resonance radiation, evolving in a perpendicular magnetic field and probed via Faraday rotation. We believe that thin cell technology is paving the way for the miniaturization of atomic beam-based sensors.