基于 Cs-Ne 微腔的高性能频率稳定紧凑 CPT 钟。

A high-performance frequency stability compact CPT clock based on a Cs-Ne microcell.

出版信息

IEEE Trans Ultrason Ferroelectr Freq Control. 2012 Nov;59(11):2584-7. doi: 10.1109/TUFFC.2012.2493.

DOI:10.1109/TUFFC.2012.2493

PMID:23192824

Abstract

This paper reports on a compact table-top Cs clock based on coherent population trapping (CPT) with advanced frequency stability performance. The heart of the clock is a single buffer gas Cs-Ne microfabricated cell. Using a distributed feedback (DFB) laser resonant with the Cs D1 line, the contrast of the CPT signal is found to be maximized around 80°C, a value for which the temperature dependence of the Cs clock frequency is canceled. Advanced techniques are implemented to actively stabilize the clock operation on a zero-light-shift point. The clock frequency stability is measured to be 3.8 × 10(-11) at 1 s and well below 10(-11) until 50,000 s. These results demonstrate the possibility to develop high-performance chip-scale atomic clocks using vapor cells containing a single buffer gas.

摘要

这篇论文报道了一种基于相干布居囚禁（CPT）的紧凑型桌面铯钟，具有先进的频率稳定性能。时钟的核心是一个单缓冲气体铯-氖微制造单元。使用与 Cs D1 线共振的分布式反馈（DFB）激光，发现 CPT 信号的对比度在 80°C 左右最大化，此时 Cs 钟频率的温度依赖性被抵消。采用先进技术主动稳定时钟操作在零光移点上。时钟频率稳定性在 1 秒时测量为 3.8×10(-11)，低于 10(-11)，直到 50000 秒。这些结果表明，使用含有单缓冲气体的蒸汽室开发高性能芯片级原子钟是可能的。