Ramsey-coherent population trapping Cs atomic clock based on lin∥lin optical pumping with dispersion detection

Cheng Peng-Fei^{1, 2}, Zhang Jian-Wei^{2, 3, †}, Wang Li-Jun^{1, 2, 3, ‡}

Doppler-free absorption spectra of Cs D₁ line in the nonbuffered reference cell (upper black line) and the buffered clock cell (lower red line). The clock cell spectra record the bichromatic laser absorption characteristics. The two absorptions correspond to excited levels ∣ 6 2 P 1 / 2 , F ′ = 4 〉 and ∣ 6 2 P 1 / 2 , F ′ = 3 〉 , as marked.