Optimal Microwave Radiation Field Parameters for Mercury Ion Microwave Frequency Standards
Zhi-Hui Yang1,2,3, Hao Liu1,2,3, Yue-Hong He1,2,3, Man Wang1,2,3, Yong-Quan Wan1,2,3, Yi-He Chen1,2, Lei She1,2**, Jiao-Mei Li1,2**
1Key Laboratory of Atomic Frequency Standard, Chinese Academy of Sciences, Wuhan 430071 2Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 3University of Chinese Academy of Sciences, Beijing 100049
Abstract：We propose a method to determine the optimal power of the microwave resonance transition that simultaneously improves the signal-to-noise ratio and reduces line width based on saturation broadening theory and experiment. Saturation broadening spectra of the ground state hyperfine transition of trapped $^{199}$Hg$^{+}$ ions are measured and analyzed. The value of the optimal microwave power is obtained by using the proposed method and is verified. Rabi oscillations decay spectra of trapped $^{199}$Hg$^{+}$ ions are observed and the optimal microwave irradiation time for the maximum transition signal intensity is determined. This work will help to improve the short-term frequency stability of the mercury ion microwave frequency standard.
2016, Vol. 33 
