Towards a compact atomic clock based on coherent population trapping and the grating magneto-optical trap
Towards a compact atomic clock based on coherent population trapping and the grating magneto-optical trap
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DOI：
10.1117/12.2516612
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发表时间：
2019-03
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影响因子：
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通讯作者：
G. Hoth;Rachel Elvin;Michael W. Wright;B. Lewis;A. Arnold;P. Griffin;E. Riis
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作者：
G. Hoth;Rachel Elvin;Michael W. Wright;B. Lewis;A. Arnold;P. Griffin;E. Riis
相干布居囚禁（CPT）和激光冷却原子的结合是实现下一代紧凑型原子频率基准的一个很有前途的平台。为了实现这一目标，我们开发了一种基于光栅磁光阱（GMOT）和高对比度线性CPT方案的装置，以探索可以实现的性能。冷原子系统的一个重要的权衡来自于同时最大化可用于询问的冷原子的数量和系统的重复率的需要。这种妥协可以通过从一个循环到另一个循环重新捕获冷原子来减轻。在这里，我们报告的冷原子数在我们的系统，这将使我们能够优化这种权衡的夺回制度的定量表征。我们还报道了最近的短期频率稳定度的测量结果，短期阿伦偏差为3 × 10-11/τ，平均时间为τ = 10 s。
The combination of coherent population trapping (CPT) and laser cooled atoms is a promising platform for realizing the next generation of compact atomic frequency references. Towards this goal, we have developed an apparatus based on the grating magneto-optical trap (GMOT) and the high-contrast lin ⊥ lin CPT scheme in order to explore the performance that can be achieved. One important trade-off for cold-atom systems arises from the need to simultaneously maximize the number of cold atoms available for interrogation and the repetition rate of the system. This compromise can be mitigated by recapturing cold atoms from cycle to cycle. Here, we report a quantitative characterization of the cold atom number in the recapture regime for our system, which will enable us to optimize this trade-off. We also report recent measurements of the short-term frequency stability with a short-term Allan deviation of 3 × 10-11/τ up to an averaging time of τ = 10 s.