Abstract
Because of the excellent long-term stability of cesium beam atomic clocks, they are widely used in the field of punctuality. The research of cesium beam atomic clocks is to optimize and improve their stability gradually. In order to improve the stability of our optically pumped cesium beam atomic clock, we have optimized the circuit system in the atomic clock, including the microwave source and other circuits. Compared to the result in 2020 year, the final stability has been improved by nearly 30%. It shows that circuit noise is an important source which affects the signal-to-noise ratio in compact optically pumped cesium beam clocks. It is necessary to consider and reduce the influence of circuit noise in the design and manufacture of atomic clocks.
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