锶原子光钟钟跃迁谱线探测中的程序控制

Program control in transition observation of strontium optical lattice clock

为了实现中国科学院国家授时中心研制的锶原子光晶格钟钟跃迁的自动化探测,设计了完整的自动控制系统。该系统主要由延迟精度与同步精度在μs量级的时序控制系统和满足要求的激光频率扫描系统组成。两个控制系统均通过LabVIEW软件编程及虚拟仪器控制光场和磁场。完成了锶原子的两级冷却和光晶格囚禁,最终得到了高信噪比载波线宽为180Hz的锶原子1S0-3P0钟跃迁谱线。谱线展现了高信噪比和窄线宽的特点,表明整个锶原子光钟系统的运行较为稳健,整个控制系统满足实验对于控制精度的需求,实现了锶原子光钟系统的自动化操作与控制。该控制系统具有一定普适性,也可拓展至需要对光场及磁场进行控制的其他系统中。

To achieve the auto control of transition observation of the Optical Lattice Clock transition developed by the National Time Service Center,Chinese Academy of Sciences,a complete control system is designed.The control system consists of a timing sequence control unit with delay accuracy and synchronizing precision inμs level and a laser spectral scanning control unit.The two units were both realized through the virtual instrument exploited by LabVIEW software programming to control the optical field and magnetic field precisely.The two-level cooling and optical lattice trapping of strontium atoms are implemented and the high signal-to-noise ratio（SNR）clock transition 1S0-3P0 spectral line of strontium atom with a line-width of 180 Hz is obtained.The spectral line with higher SNR and narrower line width indicate that the optical lattice clock can operate in higher stability and whole control system meets the precision requirement of the running of strontium optical clock system.Moreover,the experiment demonstrates that the control system has universality,and can be extended to other systems to control the optical fields and magnetic fields.