1. Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing 100871, China;
2. School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China
A rubidium-beam microwave clock, optically pumped by a distributed feedback diode laser, is experimentally investigated. The clock is composed of a physical package, optical systems, and electric servo loops. The physical package realizes the microwave interrogation of a rubidium-atomic beam. The optical systems, equipped with two 780-nm distributed feedback laser diodes, yield light for pumping and detecting. The servo loops control the frequency of a local oscillator with respect to the microwave spectrum. With the experimental systems, the microwave spectrum, which has an amplitude of 4 nA and a line width of 700 Hz, is obtained. Preliminary tests show that the clock short-term frequency stability is 7×10-11 at 1 s, and 3×10-12 at 1000 s. These experimental results demonstrate the feasibility of the scheme for a manufactured clock.
Lecomte S, Haldimann M, Ruffieux R and Berthoud P 2007 IEEE International Frequency Control Symposium Joint with the, European Frequency and Time Forum, May 29-June 1, 2007, Geneva, Switzerland pp. 1127-1131
[3]
Cao Y H, Zhao X W, Yang L, Chen H and Zhang S G 2014 IEEE International Frequency Control Symposium, May 19-22, 2014, Taipei, Taiwan, pp. 1-4
[4]
Wang Q, Duan J, Qi X H, Zhang Y and Chen X Z 2015 Chin. Phys. Lett. 32 054206
[5]
Wang B, Lv D S, Qu Q Z, Zhao J B, Li T, Liu L and Wang Y Z 2011 Chin. Phys. Lett. 28 063701
[6]
Ren W, Gao Y C, Li T, Lv D S and Liu L 2016 Chin. Phys. B 25 060601
[7]
Arditi M and Cerez P 1972 IEEE Transactions on Instrumentation & Measurement 21 391
[8]
Cerez P and Hartmann F 1977 IEEE Journal of Quantum Electronics 13 344
[9]
Besedina A, Gevorkyan A, Mileti G and Zholnerov V 200620rm th European Frequency and Time Forum, March 27-30, 2006, Braunschweig, Germany, pp. 270-276
[10]
Urabe S, Nakagiri K, Ohta Y and Kobayashi M 1980 IEEE Transactions on Instrumentation & Measurement 29 304
[11]
De Marchi A 1987 IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control 34 598
[12]
Besedina A, Gevorkyan A and Zholnerov V 2007 IEEE International Frequency Control Symposium Joint with the, European Frequency and Time Forum, May 29-June 1, 2007, Geneva, Switzerland, pp. 623-628
[13]
Guo J and Wang Y H 2013 Chin Phys. Lett. 30 023201
[14]
Dimarcq N, Giordano V, Theobald G and Cerez P 1991 J. Appl. Phys. 69 1158
[15]
Ramsey N F 1950 Phys. Rev. 78 695
[16]
Vanier J and Audoin C 1989 The Quantum Physics of Atomic Frequency Standards(Bristol:A. Hilger)
[17]
Liu C and Wang Y H 2015 Chin. Phys. B 24 010602
[18]
Audoin C, Candelier V and Diamarcq N 1991 IEEE Transactions on Instrumentation & Measurement 40 121
[19]
Jun J W and Lee H S 1998 Phys. Rev. A 58 4095
[1]
Effective sideband cooling in an ytterbium optical lattice clock Jin-Qi Wang(王进起), Ang Zhang(张昂), Cong-Cong Tian(田聪聪), Ni Yin(殷妮), Qiang Zhu(朱强), Bing Wang(王兵), Zhuan-Xian Xiong(熊转贤), Ling-Xiang He(贺凌翔), and Bao-Long Lv(吕宝龙). Chin. Phys. B, 2022, 31(9): 090601.
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
