Fig. 3: Ramsey CPT spectroscopy of the atomic beam. | Nature Communications

Fig. 3: Ramsey CPT spectroscopy of the atomic beam.

From: A chip-scale atomic beam clock

Fig. 3

a Schematic of two-zone Ramsey interrogation of the atomic beam. b Level diagram illustrating the CPT Λ-systems. c Spectroscopic signal observed in 2nd Ramsey zone shows three, MHz-width CPT features. d The central CPT feature contains the clock signal Ramsey fringe with ≈15 kHz width and ≈15% fluorescence contrast.

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