用于本地时标系统的铯原子喷泉钟研制  

Development of cesium fountain clock as local precision time and frequency standard

作　　者：李慧 杜远博 刘洪力 陆泽晃 LI Hui;DU Yuanbo;LIU Hongli;LU Zehuang(MOE Key Laboratory of Fundamental Physical Quantities Measurement&Hubei Key Laboratory of Gravitation and Quantum Physics,PGMF and School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China;MOE Key Laboratory of TianQin Mission,TianQin Research Center for Gravitational Physics,Frontiers Science Center for TianQin,CNSA Research Center for Gravitational Waves,Sun Yat-sen University(Zhuhai Campus),Zhuhai 519082,Guangdong China)

机构地区：[1]华中科技大学物理学院,基础物理量测量教育部重点实验室&湖北省引力与量子物理重点实验室&精密重力测量国家重大科技基础设施,湖北武汉430074 [2]中山大学(珠海校区),“天琴计划”教育部重点实验室,天琴中心&物理与天文学院,天琴前沿科学中心,国家航天局引力波研究中心,广东珠海519082

出　　处：《华中科技大学学报（自然科学版）》2022年第9期23-29,共7页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(11804108,11774108,11904113);国家重点研发计划资助项目(2017M612431)。

摘　　要：研制了一套铯原子喷泉钟系统作为精密重力测量国家重大科技基础设施的本地时标,并最终溯源到国际单位制“秒”定义.描述了铯原子喷泉钟的整体设计方案,包括真空物理系统、光学系统、微波综合链和电子学控制系统.实验上实现了原子的上抛和捕获,成功地扫描到Ramsey条纹.获得的Ramsey中心条纹线宽0.911(2)Hz,条纹对比度约为90.8%.通过将喷泉钟本地振荡器锁定到Ramsey中心条纹,并与氢钟比对,测得铯原子喷泉钟的频率稳定度为3.2×10^(-13)τ^(-1/2)(τ为测量时间).同时讨论了影响频率稳定度的各贡献项及后续提升方案.The development of a cesium fountain clock system to serve as the local time and frequency standard for the National Precise Gravity Measurement Facility was discussed.The design and construction of the entire fountain clock system was described,including the physical system,the optical system,the microwave frequency synthesizer,and the electronics control system.Experimentally,the cesium atoms are successfully launched and captured,and Ramsey fringes are obtained.The central Ramsey fringe has linewidth of 0.911(2)Hz,with a contrast of 90.8%.By locking the local oscillator to the central Ramsey fringe,and comparing with a hydrogen maser,a frequency stability of 3.2×10^(-13)τ^(-1/2)(τis the measurement time)has been achieved.The limiting factors of the frequency stability are also discussed with suggestions for further improvements.In addition,major uncertainty contributions are also being evaluated.

关 键 词：时频溯源装置 铯原子喷泉钟 Ramsey条纹 频率稳定度 氢钟 

分 类 号：P312.1[天文地球—固体地球物理学]