采用直接调制分布布拉格反射镜laser的高性能相干布居俘获原子钟
High-performance coherent population trapping atomic clock with direct-modulation distributed Bragg reflector laser
摘要：
相干布居数俘获（CPT）原子钟由于其体积小、性能高，在下一代星载应用中具有广阔的应用前景。本文提出并实现了一种基于大调制带宽、窄线宽分布布拉格反射镜激光器直接调制的CPT原子钟，取代了高性能CPT钟中常用的外部体调制器。我们的方法保留了高性能，同时显着减少的大小。利用这种高度紧凑的双色光源和最简单的CPT结构，用圆偏振双色激光询问^{87}Rb原子系统，观察到了窄线宽、高对比度的CPT时钟跃迁信号。然后，我们将本地振荡器频率锁定到CPT误差信号，并证明短期频率稳定性为3.6 \times 10^{-13} τ^{-1/2}（4 s \le τ \le 200 s）。我们将其归因于超低的激光频率和强度噪声以及高品质因数的CPT信号。该研究为基于该方案的紧凑型高性能CPT时钟的研制奠定了基础。
英文摘要：
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} τ^{-1/2} (4 s \le τ \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.
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