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Experimental setup consisting of three main parts: ET: etalon; SAS: saturated absorption spectrometer; CSA: confocal spectrum analyzer; PD: photodiode; PO: polarization orthogonalizer; FPD: fast photodiode; DPD: digital phase detector; FC: frequency counter; : microwave spectrum analyzer.
(a) Fractional transmission through the rubidium cell near the CPT resonance: (b) Phase shift between the 3.036 GHz beat signal before and after the rubidium cell.
(a) Microwave spectrum of the beat signal when the two modes are phase locked to the CPT dispersion. (b) Allan deviation of the beat signal. The upper trace is when the two modes are free running and the lower trace is when phase locked to the CPT.
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