A frequency standard via spectrum analysis and direct digital synthesis

作者：Li Dawei; Shi Daiting; Hu Ermeng; Wang Yigen; Tian Lu; Zhao Jianye; Wang Zhong^*

来源：Applied Physics Express, 2014, 7(11): 112203.

DOI：10.7567/APEX.7.112203

We demonstrated a frequency standard based on a detuned coherent population beating phenomenon. In this phenomenon, the beat frequency of the radio frequency for laser modulation and the hyperfine splitting can be obtained by digital signal processing technology. After analyzing the spectrum of the beat frequency, the fluctuation information is obtained and applied to compensate for the frequency shift to generate the standard frequency by the digital synthesis method. Frequency instability of 2.6 x 10(12) at 1000 s is observed in our preliminary experiment. By eliminating the phase-locking loop, the method will enable us to achieve a full-digital frequency standard with remarkable stability.

• 出版日期2014-11
• 单位北京大学