Noise Sources Evaluation of Compact Optically Pumped Cesium Beam Atomic Clock

SummaryThe short-term frequency stability of compact optically pumped cesium beam atomic clock is directly affected by signal-to-noise ratio of its Ramsey spectrum. In this paper, the noise sources of compact optically pumped cesium beam atomic clock are analyzed. On the basis of the parameters in our optically pumped cesium beam atomic clock, the noise contributions of different sources within 1Hz bandwidth are studied, and the corresponding signal-to-noise ratios are calculated. According to the evaluation results, one of the main noise sources of the compact optically pumped cesium beam atomic clock is the frequency noise of the detection laser.