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题名	铷喷泉钟组的系统搭建与性能评估
作者	董日昌
文献子类	博士
导师	魏荣
关键词	原子频标 atomic frequency standard 铷原子喷泉钟 rubidium atom clock 误差评估 uncertainty evaluation 受激拉曼双光子跃迁 the stimulated Raman two-photon transition 实时噪声补偿 the real-time noise compensation
其他题名	Construction and performance evaluation of the Rubidium atomic fountain clock group
英文摘要	本论文介绍了本人在SIOM（上海光机所）量子光学实验室所做的工作，主要包括85Rb喷泉钟系统搭建和前期物理实验，87Rb喷泉钟系统升级及后期误差评估与性能改进。 基于实验室研制87Rb喷泉钟的经验，我们设计并搭建了国际上第一台也是目前唯一的一台85Rb喷泉钟。目前各相关的子系统包括真空系统、光学系统、微波系统、电子学系统和控制采集系统已搭建完毕，完成总装并进行了前期物理实验，实现俘获冷原子云原子数108量级，得到了TOF信号。 为了提高87Rb喷泉钟的性能，我们对其物理系统做了一次升级改造，更换了Ramsey作用区的微波腔，降低了腔Q值，改善了真空环境和Ramsey作用区的温度场环境；另外设计了新的本地振荡器（Local Oscilator, LO）控制电路，提高了电压控制精度，最终实现87Rb喷泉钟短期稳定度为2.7×10-13τ-1/2，30000s积分时间稳定度达到1.6×10-15。 在评估87Rb喷泉钟不确定度过程中，我们实现了基于受激拉曼双光子跃迁的弱磁敏磁场测量技术，基于跃迁谱线强度的磁场方向测量技术和基于偏置电流实时补偿磁场起伏技术。不仅实现了喷泉钟内磁场强度、方向的精密测量，满足了磁场相关不确定度评估的需要，并且动态改善了原子云磁场起伏，降低了磁场导致的频移不确定度。另外，我们提出了两种改善喷泉钟稳定度的方案，Hyper-Ramsey技术和实时噪声补偿技术。; The construction of an 85Rb atomic fountain clock and the early physical experiment, the system upgrade and the uncertainty evaluation of an 87Rb atomic fountain clock were presented in this thesis. Based on the experience of developing an 87Rb atomic fountain clock, we designed and built currently the first and the only one of 85Rb atomic fountain clock in the world presently. Now each related subsystems, including vacuum system, optical system, microwave system, electronic system and control system have been built up. Moreover, the overall assembly and the early physical experiment were finished with more than 108 cold atoms, and the time-of-flight signal has been observed. In order to improve the performance of 87Rb atomic fountain clock, we have made a physical system upgrade, replaced the microwave cavity of the Ramsey zone, decreased its Q value, elevated the vacuity and the temperature uniformity. In addition, we designed new control circuit with higher accuracy for the local oscillator. Finally, a short-term stability of 2.7×10-13τ-1/2 and 1.6×10-15 @30000s were reached. In the process of evaluating the 87Rb atomic fountain clock, we invented the magnetic field measurement technologies based on the stimulated Raman two-photon transition and weak magnetic-sensitive property, the magnetic field direction measurement technology based on the transition line strength, and the real-time magnetic field compensation technology based on bias current modulation. Not only the direction of the magnetic field and the intensity in the fountain clock were precision measured to meet the need of the magnetic field related to the uncertainty evaluation, but also the magnetic field homogeneity was dynamicly improved, reducing the related uncertainty of frequency shift. Finally, we put forward two schemes for the stability improvement, including the Hyper-Ramsey technology and the real-time noise compensation technology.
学科主题	光学
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/30971]
专题	中国科学院上海光学精密机械研究所
作者单位	中国科学院上海光学精密机械研究所
推荐引用方式 GB/T 7714	董日昌. 铷喷泉钟组的系统搭建与性能评估[D].

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