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
通过调制转移光谱稳频的方式，将外腔半导体激光器频率锁定于87Rb原子D2线超精细跃迁52S1/2，F=2→52P3/2，F=3，使激光器线宽由自由运转的382.18 kHz压窄至稳频后的37.94 kHz。稳频后的窄线宽激光用于积分球冷原子钟的探测光，可以将激光频率噪声对原子钟短期稳定度的影响降低至5.6×10-14 τ-1/2。
激光器与激光光学 调制转移光谱 激光稳频 外腔半导体激光器 积分球冷原子钟 频率稳定度 激光与光电子学进展
2023, 60(15): 1514008
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 中国科学院大学材料与光电研究中心, 北京 100049
3 国防科技创新研究院前沿交叉技术研究中心, 北京 100010
研制了一种用于冷原子重力仪的集成化、低相噪、多通道微波频率综合器。利用锁相环技术,将100 MHz晶振锁定到10 MHz晶振上,改善了100 MHz晶振近端的相位噪声,使输出至后级倍频链路的100 MHz信号的相位噪声同时具备10 MHz及100 MHz晶振的优点。通过搭建超低相噪倍频链路,得到 87Rb原子基态跃迁所需的6.834 GHz微波信号。通过互相关法测量得到在频偏为1 Hz和10 kHz处的相位噪声分别为-60 dBc/Hz和-120 dBc/Hz,其频率分辨率为1.42×10 -6 Hz,并评估了其相位噪声对冷原子重力仪测量分辨率的影响。该微波频综方案具有普适性,可广泛应用于原子钟和干涉仪等量子精密测量领域。
测量与计量 精密测量 微波频综 低相噪 锁相环 冷原子重力仪 中国激光
2021, 48(23): 2311001
Author Affiliations
Abstract
1 College of Science, Zhejiang University of Technology, Hangzhou 310023, China
2 Department of Physics, Zhejiang University, Hangzhou 310027, China
3 Key Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
We demonstrate a two-component detection of a coherent population trapping (CPT) resonance based on virtually imaged phased array (VIPA). After passing through a VIPA, the two coupling lights with different frequencies in the CPT experiment are separated in space and detected individually. The asymmetric lineshape is observed experimentally in the CPT signal for each component, and the comparison with the conventional detection is presented. The shift of the CPT resonant frequency is studied with both the two-component and one-component detections. Our scheme provides a convenient way to further study the CPT phenomenon for each frequency component.
virtually imaged phased array coherent population trapping Chinese Optics Letters
2021, 19(8): 083001
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
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
Author Affiliations
Abstract
High contrast transparent Ramsey fringes are observed using double microwave pulses interaction with the prepared atomic coherent state in a warm 87Rb vapor with mixture buffer gases in a closed cell. The Ramsey fringes are generated by the pulsed technique, a strong coupling light pulse and a weak signal light pulse are applied to prepare the atomic coherent state, followed by the application of double microwave pulses to interact with the atomic coherent state. Afterwards, the light pulses are applied again with weaker intensity and detecting the signal transmission is delected. The central line of the transparent Ramsey fringes has narrow linewidth of 125 Hz and high contrast of 21%. The light shift is dramatically reduced since the interrogating process is not involved the light field, and the cavity pulling effect is negligible due to the low Q requirement, which is promising for building small, compact, and stable atomic clocks.
270.1670 Coherent optical effects 190.4180 Multiphoton processes Chinese Optics Letters
2013, 11(3): 032701
Author Affiliations
Abstract
We report an experimental observation of the optical transparency enhancement resonances in Hanle-electromagnetically induced transparency (EIT) configuration with a microwave field excitation. In this experimental system, a strong control field and a weak probe field form three-level -type configurations of EIT. The fourth level is coupled by an additional microwave field. With the microwave field excitation, the probe field undergoes a process of absorption to transparency when the probe field decreases. Compared with the EIT effect, this result indicates optical transparency enhancement. A simple theoretical model and a numerical simulation are presented to explain the observed experimental results. The applications of these optical features are also discussed.
270.1670 Coherent optical effects 190.4180 Multiphoton processes Chinese Optics Letters
2013, 11(2): 022701
