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一个44立方厘米的物理包装,用于高性能脉冲光学原子钟

Qiang Hao¹, Shaojie Yang¹, Shuguang Zheng¹

¹Key Laboratory of Time Reference and Applications, National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, China.

The Review of scientific instruments

|August 16, 2024

概括

研究人员开发了一种紧的脉冲光学 (POP) 原子钟. 这个微型原子钟实现了出色的频率稳定性,克服了以前的尺寸限制.

科学领域:

原子,分子和光学物理学
计量学和测量科学计量学和测量科学

背景情况:

脉冲光学 (POP) 原子钟提供高频稳定性,但通常很大.
微型化POP原子钟带来了重大的工程挑战.

研究的目的:

为POP原子钟设计和描述一个小型化的物理包.
分析小型原子钟的性能指标,包括稳定性和噪声源.

主要方法:

设计了一个紧的物理包装,其中包括一个磁铁子微波腔和一个小的蒸汽电池 (1.3厘米内部直径).
分析了Zeeman过渡光谱以确认微波腔共振 (TE011类模式).
使用低噪音测试台量化评估放松时间,线宽和噪声.

主要成果:

在333K时实现的群体和连贯度放松时间为3.16~0.16ms和2.97~0.03ms,与理论预测一致.
观察到拉姆西信号对比度为35%,线宽为192 Hz.
迷你物理包装的体积约为44厘米3,包括磁屏蔽.
测量的短期频率稳定性为4.8 × 10−13τ−1/2.2.

结论:

开发的微型POP原子钟在频率稳定方面表现出有前途的性能.
短期稳定的主要限制是激光系统的相对强度噪声.
这项工作为更紧,更便携的高性能原子钟铺平了道路.

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