一种铷原子钟超高信噪比物理系统的研究
收稿日期: 2023-03-02
网络出版日期: 2023-03-30
基金资助
中国科学院重点部署项目(ZDRW-KT-2021-2)
Investigation of an Ultra High Signal-to-noise Ratio Physics Package for the Rubidium Atomic Clock
Received date: 2023-03-02
Online published: 2023-03-30
在卫星导航、深空探测等尖端技术应用的需求牵引下，谱灯抽运铷原子钟的性能有了很大提升，其短期频率稳定度已达到小系数10-13τ -1/2水平．为能进一步提高铷钟稳定度并探索铷钟性能指标极限，本文在前期对物理系统（Φ40微波腔）结构的重新设计及实验验证的基础上，通过对物理系统的光学系统全面优化设计，改善了光谱灯及抽运光的性能，最终使物理系统信噪比获得了明显提升．测试及分析评估结果表明，新设计的物理系统的散粒噪声对铷钟稳定度的贡献为4.2×10-14τ -1/2，本文的研究结果为今后铷钟短稳实现5×10-14τ -1/2、长稳突破1×10-15进入~10-16奠定了基础．
崔家齐 , 刘康琦 , 李俊瑶 , 王芳 , 明刚 , 赵峰 , 梅刚华 , 钟达 . 一种铷原子钟超高信噪比物理系统的研究[J]. 波谱学杂志, 2023 , 40(4) : 462 -470 . DOI: 10.11938/cjmr20233056
Driven by the demand for satellite navigation and deep space exploration, the performance of lamp-pumped rubidium atomic clock has been greatly improved, and its short-term frequency stability has reached the level of a small coefficient of 10-13τ -1/2. To further improve the frequency stability of rubidium clock and explore its performance limit, this article is based on the redesign and experimental verification of the structure of the physical package (PP, Φ40 microwave cavity) in the early stage, with a comprehensively optimized design of the optical system of PP, the performance of the spectral lamp and pumping light has been enhanced. Finally, the SNR of PP has been significantly increased. The test and evaluation results showed that the contribution of the shot noise of the newly designed PP to the frequency stability of rubidium clock is 4.2×10-14τ -1/2. The results of this research lay the foundation for the short-term stability of rubidium clocks to achieve 5×10-14τ -1/2, and the long-term stability to break through 1×10-15.
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