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Distributed Cavity Phase and the Associated Power Dependence

机译：分布腔相位和相关的功率依赖性

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摘要

We discuss the power dependence of distributed cavity phase errors for cylindrical TE_(011) cavities in laser-cooled atomic fountain clocks. The azimuthally symmetric phase variations produce a surprisingly large distributed cavity phase error for two 2π, 4π, and 6π pulses. This is due to the correlation between the transverse variation of the Rabi frequency over the cavity aperture and a quadratic density variation of the atomic sample, along with the symmetry of the longitudinal phase variation in the cavity. We show that the large azimuthally symmetric fields and phase shifts near the walls of the endcap holes produce very small errors at optimal power for a uniform wall resistance. We also show the power variation for higher order azimuthal variations m=1, 2, and 4. These may be caused by fountain tilts, non-uniform detection of atoms, and asymmetries in the laser trapping and cooling of the atoms. We demonstrate that distributed cavity phase errors in physical cavities may have no variation with the microwave power. A combination of rigorous calculations of cavity losses, measurements of power dependence, the atomic distributions, and fountain tilts, and electrical measurements that show the lower limit of the cavity Q and the cavity symmetry, should provide stringent limits on distributed cavity phase errors for current atomic clocks.
机译：我们讨论了激光冷却原子喷泉时钟中圆柱TE_（011）腔的分布式腔相位误差的功率依赖性。方位对称的相位变化会为两个2π，4π和6π脉冲产生出乎意料的大分布腔相位误差。这是由于腔孔径上的拉比频率的横向变化与原子样本的二次密度变化以及腔中纵向相位变化的对称性之间的相关性。我们显示，端盖孔壁附近的大方位角对称场和相移会在以最佳功率产生均匀壁电阻的情况下产生非常小的误差。我们还显示了高阶方位角变化m = 1、2和4的功率变化。这可能是由于喷泉倾斜，原子的不均匀检测以及激光俘获和冷却原子的不对称引起的。我们证明物理腔中的分布式腔相位误差可能不会随微波功率而变化。严格的腔体损耗计算，功率相关性测量，原子分布和喷泉倾角以及显示腔体Q的下限和腔体对称性的电气测量的结合，应为电流的分布腔体相位误差提供严格的限制原子钟。

著录项

  • 来源
    《》|2005年|P.99-104|共6页
  • 会议地点 Vancouver(CA)
  • 作者

    Ruoxin Li; Kurt Gibble;

  • 作者单位

    Physics Department, The Pennsylvania State University, State College, PA, the United States;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 频率合成技术、频率合成器;
  • 关键词

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