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Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)

Improvement of the signal-to-noise ratio of the clock signal for the frequency standard based on 113Cd+ ions

K. Miao, Jianwei Zhang, Shiguang Wang, Z. B. Wang, L. J. Wang

Published May 1, 2014• 3 citations
Publisher

Abstract

Microwave frequency standard based on laser-cooled113Cd+ions has promising performance. The fluorescence decays during detection are one of main limits to the signal-to-noise ratio (SNR) of clock signal. This phenomena is assumed cause by detection laser. We try to verify this assumption by rate equations. Two mathods to improve SNR are also proposed.

DOI
10.1109/fcs.2014.6860002

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Microwave frequency standard based on laser-cooled113Cd+ions has promising performance. The fluorescence decays during detection are one of main limits to the signal-to-noise ratio (SNR) of clock signal. This phenomena is assumed cause by detection laser. We try to verify this assumption by rate equations. Two mathods to improve SNR are also proposed.
Microwave frequency standards based on ions are promising as the next generation atomic clocks. This paper reports the recent progresses of the microwave frequency standard based on laser-cooled113Cd+ions developed at Tsinghua University. Based on the current experimental setup, the ground-state hyperfine splitting of113Cd+is measured with higher precision and a better short-term frequency stability is obtained than before. To improve the performance of the Cd+clock further, a new experimental setup with dual-traps is designed, and bi-ions operation is proposed.