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, ‡}

(a) Stability of the magnetic C-field. The C-field value is calculated by measuring the drive current of the solenoid, which generates 2.346 μ T/mA. (b) Measured magnetically-induced clock frequency shift due to the second-order Zeeman shifts of the related energy levels. The measured data (black squares) are fitted approximately linearly (red line) in a small interval around 10 μ T, and the coefficient of the Zeeman shift is then calculated to be 48.0 mHz/ μ T 2 , which is close to the theoretical value of 42.7 mHz/ μ T 2 .