标题： 基于自由钙原子的光频标准的稳定性极限 显示英文标题

标题： Stability limits of an optical frequency standard based on free Ca atoms

摘要： 我们为基于冷的、自由膨胀的钙原子的光频标准量化了一个短期不稳定度预算。 这类系统由于其高频率稳定性和相对于捕获原子光钟而言的相对技术简单性，再次受到关注。 通过将657 nm的钟激光通过一个高精细度腔进行过滤，我们观察到由混叠本地振荡器噪声引起的光学迪克效应略有减少。 最终限制的技术噪声是使用一种不依赖于第二个钟或飞秒梳的技术进行测量的。 显示英文摘要

摘要： We have quantified a short term instability budget for an optical frequency standard based on cold, freely expanding calcium atoms. Such systems are the subject of renewed interest due to their high frequency stability and relative technical simplicity compared to trapped atom optical clocks. By filtering the clock laser light at 657 nm through a high finesse cavity, we observe a slight reduction in the optical Dick effect caused by aliased local oscillator noise. The ultimately limiting technical noise is measured using a technique that does not rely on a second clock or fs-comb.