An Engineered High Performance Optically Pumped Compact Cesium Atomic Clock

As a primary frequency standard, the cesium atomic clock has a wide range of military and civilian applications. The cesium atomic clock realized by the optical pumping principle has a high atom utilization rate and has the potential to achieve higher performance. Our team focuses on the research and development of the optically pumped compact cesium atomic clock, and explores the advantages of optical pumping technology on the basis of the currently commercialized optically pumped compact cesium atomic clock. The mature cat-eye structure was used to further narrow the laser linewidth and realize the laser output with a linewidth less than 350kHz. The short-term and medium-term stability of the optically pumped compact cesium atomic clock was increased by more than 3 times to reach the level of 3.88 × 10−12τ−1/2. The high-stability constant current source realized by high-stability constant current source technology is combined with C field servo technology to make C field stability less than 1 × 10–4 level. At the same time, the mature liquid crystal phase retarder solution was used to stabilize the laser power amplitude, and the Allan deviation of the power stability test reached the level of 1 × 10–5/s. The long-term stability of the optically pumped compact cesium atomic clock was improved by improving the C field stability and laser power. Through testing, the long-term stability of the optically pumped compact cesium atomic clock has entered the level of less than 1 × 10–14/day. The frequency stability of the solution is increased 3 times higher than that of the 5071A high-performance product. Based on the technology and production of the existing commercial optically pumped compact cesium atomic clock, an engineering prototype has been realized, and now it has entered the stage of small batch trial production.