Suppression of light shifts in pulsed CPT atomic clock using combined error signal in Ramsey spectroscopy

This study details the experimental use of a combined error signal (CES) method in Ramsey spectroscopy with a pulsed Rb CPT atomic clock to counteract light shift frequencies. By employing a linear combination of two error signals, generated during different free evolution times in a pulse sequence, this method effectively neutralizes field shift impacts. The precise calibration of coefficient allows for an error signal that remains constant despite varying field shifts. Experimentally, this technique has proven to reduce the effects of fluctuations in optical radiation and modulating microwave signal power, which can significantly enhance the long-term stability of atomic frequency standards.