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Dick Effect in a Microwave Frequency Standard Based on Laser-Cooled 113Cd+ Ions |
| ZHANG Jian-Wei1,2, MIAO Kai1,2, WANG Li-Jun1,2,3** |
1Department of Precision Instrument, Tsinghua University, Beijing 100084
2Joint Institute for Measurement Science, Tsinghua University, Beijing 100084
3Department of Physics, Tsinghua University, Beijing 100084
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| Cite this article: |
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ZHANG Jian-Wei, MIAO Kai, WANG Li-Jun 2015 Chin. Phys. Lett. 32 010601 |
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Abstract The Dick effect is one of the main limits to the frequency stability of a passive frequency standard, especially for the fountain clock and ion clock operated in pulsed mode which require unavoidable dead time during interrogation. Here we measure the phase noise of the interrogation oscillator applied in the microwave frequency standard based on laser-cooled 113Cd+ ions, and analyze the Allan deviation limited by the Dick effect. The results indicate that the Dick effect is one of the key issues for the cadmium ion clock to reach expected frequency stability. This problem can be resolved by interrogating the local oscillator continuously with two ion traps.
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Published: 23 December 2014
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