标题： 高性能相干布居囚禁原子钟与直接调制分布布拉格反射器激光器 显示英文标题

标题： High-performance coherent population trapping atomic clock with direct-modulation distributed Bragg reflector laser

摘要： 相干布居囚禁（CPT）原子钟因其紧凑性和高性能，对于下一代空间应用非常有前景。 在本文中，我们提出并实现了一种基于大调制带宽和窄线宽分布布拉格反射激光器直接调制的CPT原子钟，该激光器取代了高性能CPT钟中通常使用的外部体调制器。 我们的方法在显著减小尺寸的同时保持了高性能。 使用这种高度紧凑的双色光源和最简单的CPT配置，其中圆偏振双色激光探测^{87}Rb原子系统，观察到了具有窄线宽和高对比度的时钟跃迁CPT信号。 然后我们将本地振荡器频率锁定到CPT误差信号，并展示了短时间频率稳定度为3.6 \times 10^{-13} {\tau }^{-1/2} (4 s \le {\tau} \le 200 s)。 我们认为这是由于激光频率和强度噪声极低以及CPT信号的高品质因数所致。 这项研究可以为基于我们方案的紧凑高性能CPT钟的发展铺平道路。 显示英文摘要

摘要： The coherent population trapping (CPT) atomic clock is very promising for use in next-generation spaceborne applications owing to its compactness and high performance. In this paper, we propose and implement a CPT atomic clock based on the direct modulation of a large-modulation-bandwidth and narrow-linewidth distributed Bragg reflector laser, which replaces the usually used external bulk modulator in the high-performance CPT clock. Our method retains the high performance while significantly reducing the size. Using this highly compact bichromatic light source and simplest CPT configuration, in which a circularly polarized bichromatic laser interrogates the ^{87}Rb atom system, a CPT signal of clock transition with a narrow linewidth and high contrast is observed. We then lock the local oscillator frequency to the CPT error signal and demonstrate a short-term frequency stability of 3.6 \times 10^{-13} {\tau}^{-1/2} (4 s \le {\tau} \le 200 s). We attribute it to the ultralow laser frequency and intensity noise as well as to the high-quality-factor CPT signal. This study can pave the way for the development of compact high-performance CPT clocks based on our scheme.