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相关概念视频

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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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相关实验视频

Updated: Jun 16, 2025

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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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
PubMed
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.

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Last Updated: Jun 16, 2025

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11:21

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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.