Two-step pulse observation to improve resonance contrast for coherent population trapping atomic clock
Two-step pulse observation to improve resonance contrast for coherent population trapping atomic clock
复制标题
DOI：
10.1007/s00340-017-6650-x
复制
发表时间：
2017-01
期刊：
影响因子：
--
通讯作者：
Y. Yano;S. Goka;M. Kajita
中科院分区：
文献类型：
--
作者：
Y. Yano;S. Goka;M. Kajita
为了提高相干布居俘获（CPT）原子钟的频率稳定度，我们采用两步脉冲观测方法研究了共振衬度。所提出的方法是一个两步Raman-Ramsey格式，在共振观测期间强度较低，观测后强度较高。这种方法减少了光强度的频率变化，并保持了高信噪比。用密度矩阵法计算了以Cs D1线为模型的a型三能级系统的共振特性，并用垂直腔面发射激光器和Cs蒸气室测量了共振特性。
We study resonance contrast by a two-step pulse observation method to enhance the frequency stability of coherent population trapping (CPT) atomic clocks. The proposed method is a two-step Raman–Ramsey scheme with low intensity during resonance observation and high intensity after the observation. This method reduces the frequency variation in the light intensity and maintains a high signal-to-noise ratio. The resonance characteristics were calculated by density matrix analysis of a-type three-level system that was modeled on theCs D1 line, and the characteristics were also measured using a vertical-cavity surface-emitting laser and a Cs vapor cell.