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首页> 外文期刊>Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on >Investigations on continuous and pulsed interrogation for a CPT atomic clock
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Investigations on continuous and pulsed interrogation for a CPT atomic clock

机译：CPT原子钟的连续和脉冲询问的研究

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摘要

We investigated the influence of some critical parameters and operating conditions such as cell temperature, laser intensity, and interrogation technique affecting the performances of a gas cell Cs frequency standard based on coherent population trapping (CPT). Thanks to an original experimental setup, the atoms can be trapped in the dark state and interrogated using continuous wave (CW) or pulsed coherent optical radiations. Using a double-lambda scheme, a signal contrast as high as 52% has been measured in the continuous regime for an optimum cell temperature of 35°C. Compared with the conventional continuous CPT interrogation, the pulsed interrogation technique reduces the light shift by a factor of 300 and allowed it to reach high-frequency stability for higher laser intensities. The frequency stability has been measured to be 9 x 10-13 for a 1 s integration time. Main noise contributions limiting the short-term and medium-term frequency stability are reviewed and estimated.
机译：我们研究了一些关键参数和操作条件（例如电池温度，激光强度和询问技术）对基于相干人口陷阱（CPT）的气室Cs频率标准的性能的影响。得益于原始的实验设置，原子可以在暗状态下被捕获，并可以使用连续波（CW）或脉冲相干光辐射进行询问。使用双lambda方案，在35℃的最佳电池温度的连续方案中，已测量出高达52％的信号对比度。与传统的连续CPT询问相比，脉冲询问技术将光偏移降低了300倍，并使其在更高的激光强度下达到了高频稳定性。对于1 s的积分时间，频率稳定性已测量为9 x 10-13。审查和估计了限制短期和中期频率稳定性的主要噪声贡献。

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