【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^-13τ^-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．更多还原

【Abstract】 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^-13τ^-1/2（τ is 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.更多还原