Author Affiliations
Abstract
1 Key Laboratory of Quantum Optics, and Center for Cold Atom Physics, Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences, Shanghai 201800, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
We report the recent progress of our pulsed optically pumped (POP) vapor cell rubidium clock with dispersive detection. A new compact physics package is made. A rubidium cell with a high precision buffer gases mixing ratio is obtained, and the temperature controlling system is renovated to reduce fractional frequency sensitivity to temperature variation. The resolution of the servo control voltage is also optimized. With these improvements, a clock frequency stability of 3.53×10 13 at 1 s is obtained, and a fractional frequency stability of 4.91×10 15 is achieved at an average time of τ=2000 s.
020.2930 Hyperfine structure 020.7490 Zeeman effect 350.4010 Microwaves Chinese Optics Letters
2017, 15(4): 040201
1 中国科学院上海光学精密机械研究所量子光学重点实验室, 上海 201800
2 中国科学院大学, 北京 100049
在基于Ramsey作用的原子钟里，受限于原子的相干时间及晶振的相位噪声，自由演化时间不能太长。提出了大失谐光无破坏测量方法，利用该方法获取了原子相位数据，并将其反馈到微波相位上，从而实现了原子相位反馈，有效地延长了自由演化时间。分别从理论和实验上验证了这种周期性反馈作用的可行性。
原子与分子物理学 原子相位反馈 大失谐光探测 脉冲光抽运 原子钟
Author Affiliations
Abstract
1 Key Laboratory of Quantum Optics, Center for Cold Atom Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, Shanghai 201800, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
We report a locking mode in which the local oscillator (LO) is locked to an atomic fountain and calibration of the residual frequency drift (RFD). In this running mode, the locked LO outputs a standard frequency signal, and a short-term fractional frequency stability of 2.7×10 13τ 1/2 is achieved. Due to the frequency drift of the LO in free running mode, a systematic frequency bias, or RFD, exists after being locked by the atomic fountain. We analyze and measure the RFD with a value of 3(2)×10 16. A sectionalized post-process method is adopted to calibrate the RFD.
120.0120 Instrumentation, measurement, and metrology 270.0270 Quantum optics 120.3940 Metrology Chinese Optics Letters
2015, 13(9): 091201
中国科学院上海光学精密机械研究所, 上海 201800
介绍了本课题组新概念小型化星载原子钟的研究进展。利用已有的脉冲光抽运技术和独立提出的正交偏振探测技术，将原子钟的钟跃迁信号的对比度从一般吸收法的30%提高到将近100%。该方法主要探测的是光的振幅和相位的总变化，因而能有效提高探测灵敏度和信噪比，从而提高频率稳定度。实验结果表明，正交偏振探测技术原子钟的原子频率稳定度比相同条件下吸收法原子钟的原子频率稳定度提高一个量级；而且在实验的基础上，物理系统的温度稳定度、磁场电流稳定度和激光光强稳定度都能够提高一个量级，正交偏振探测技术原子钟的秒稳能达到1×10-13,天稳能优于1×10-15，将来可能进一步发展并取代氢钟。
原子钟 脉冲光抽运 正交偏振探测 阿兰方差 激光与光电子学进展
2013, 50(8): 080012
