紧的两光子光学时钟,长期稳定性为8.1 × 10-15,没有线性漂移去除
Chen Feng1, Xinrui Luo2, Jian Duan1
1Institute of Quantum Electronics, School of Electronics, Peking University, Beijing 100871, China.
The Review of scientific instruments
|December 2, 2025
概括
我们将光纤激光器稳定到鲁比原子过渡,为一个紧的原子钟实现了高频稳定. 这种鲁比二光子光学时钟非常适合下一代太空应用.
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
- 激光物理与技术 激光物理与技术
背景情况:
- 原子钟对于导航,通信和基础科学至关重要.
- 开发紧且稳定的原子钟对于太空应用至关重要.
- 双光子转换为原子钟设计提供了优势,包括对磁场和第一阶多普勒位移的敏感性降低.
研究的目的:
- 在87Rb中将1556.2nm光纤激光器稳定到5S1/2 → 5D5/2两光子过渡中.
- 为了评估一个紧的二光子光学时钟的频率稳定性.
- 分析系统性影响,限制潜在的空间应用的时钟性能.
主要方法:
- 使用一个紧的物理包来激光稳定到87Rb的两光子过渡.
- 使用商业光纤频率来产生200MHz的微波输出.
- 对影响短期和长期稳定的系统效应进行了详细分析.
主要成果:
- 在没有线性漂移去除的情况下,在t = 1秒时达到2.2 × 10-13的分数频率稳定性,在t = 4000秒时达到8.1 × 10-15.
- 确定射击噪声是短期稳定的主要限制.
- 确定AC Stark转移是长期稳定的主要限制.
结论:
- 稳定纤维激光和二光子转换形成了一个高度稳定的紧原子钟.
- 卢比二光子光学时钟表现出了非常好的性能,适合下一代太空应用.
- 进一步优化可以减轻系统性的影响,以获得更大的稳定性.
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