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| A Physics Package with High S/N Ratio for Rubidium Atomic Frequency Standards |
| QI Feng1,2,ZHAO Feng1,WANG Fang1,XIA Bai-hua1,3,MEI Gang-hua1 |
1. Wuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences, Wuhan, Hubei 430071, China
2.Graduate School of Chinese Academy of Science, Beijing 100080, China
3. Wuhan Academy of Command Communication, Wuhan, Hubei 430012, China |
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Abstract Physics package is the core of the atomic frequency standard. By analyzing the mechanism which Signal to Noise Ratio (SNR) of the atomic discrimination signal affect the frequency stability, a modified physics package was made. This physics package is designed according to the three cell scheme, in which a slotted tube microwave cavity and a rubidium spectrum lamp with Xe as the buffer gas were used. A preliminary test on the physics package was carried out, and a short term frequency stability of nearly 8×10-13/1s was achieved. This result shows that the frequency stability of an rubidium atomic frequency standard can be better than 1×10-12/τ (1/2), and there is still space to improve long term performance of the rubidium atomic frequency standard.
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2011, Vol. 32 
