标题： 基于激光电流驱动功率调制的微蜂窝CPT原子钟，在1天内具有10$^{-12}$范围的稳定性 显示英文标题

标题： Microcell CPT atomic clock using laser current-actuated power modulation with 10$^{-12}$ range stability at 1 day

摘要： 我们提出了一种使用对称自平衡拉姆齐（SABR）光谱的相干态原子钟微腔。通过直流电源调制垂直腔面发射激光器，应用脉冲SABR序列，消除了对外部光学快门的需求，并实现了与全集成时钟的兼容性。该序列由一个基于FPGA的数字电子板控制。正确时钟操作的一个关键方面是实现了对原子信号检测窗口的实时跟踪。已经测量了时钟频率对激光功率、微波功率、激光频率和检测窗口时间的依赖性，获得了比拉姆齐-CPT光谱更低的灵敏度系数。基于微加工细胞和低渗透玻璃窗口的SABR-CPT时钟的阿伦偏差在1秒时为1.1~$\times$~10$^{-9}$，在1天积分时间时平均下降到低10$^{-12}$范围。这些结果为开发具有增强计时性能的拉姆齐-CPT芯片级原子钟铺平了道路。 显示英文摘要

摘要： We present a coherent-population trapping (CPT) microcell atomic clock using symmetric auto-balanced Ramsey (SABR) spectroscopy. The pulsed SABR sequence is applied through direct current-based power modulation of the vertical-cavity surface-emitting laser, eliminating the need for an external optical shutter and enabling compatibility with fully-integrated clocks. The sequence is controlled by a single FPGA-based digital electronics board. A key aspect of proper clock operation was the implementation of a real-time tracking of the atomic signal detection window. The clock frequency dependence on laser power, microwave power, laser frequency, and timing of the detection window has been measured, obtaining sensitivity coefficients lower than those obtained with Ramsey-CPT spectroscopy. The Allan deviation of the SABR-CPT clock, based on a microfabricated cell with low-permeation glass windows, is 1.1~$\times$~10$^{-9}$ at 1~s and averages down to the low 10$^{-12}$ range at 1 day integration time. These results pave the way towards the development of Ramsey-CPT chip-scale atomic clocks with enhanced timekeeping performances.