标题： 将脉冲且相位稳定的光传递给光学钟中的原子 显示英文标题

标题： Delivering pulsed and phase stable light to atoms of an optical clock

摘要： 在光学钟中，使用脉冲超窄激光场对离子或中性原子的跃迁进行探测。 激光的系统相位啁啾或测量过程中光路长度的变化会导致被探测原子所看到的频率发生偏移。 虽然连续波光链路的稳定技术现在已经是一项成熟的技术，即使在长距离上也是如此，但脉冲光的相位稳定链路则带来了额外的挑战，至今尚未实现。 除了实验室可能存在的温度或压力漂移，这可能导致通过不断变化的光路长度引起多普勒频移外，钟激光的脉冲特性还要求稳定锁的快速稳定时间。 我们的光路长度稳定技术使用来自相对于被探测原子固定的镜子的后向反射光以及在暗态期间的合成信号。 通过切换声光调制器来补偿长度变化和频率啁啾。 对于我们的锶光晶格钟，我们确保由光纤链路包括脉冲声光调制器引入的频移低于$2\cdot 10^{-17}$。 显示英文摘要

摘要： In optical clocks, transitions of ions or neutral atoms are interrogated using pulsed ultra-narrow laser fields. Systematic phase chirps of the laser or changes of the optical path length during the measurement cause a shift of the frequency seen by the interrogated atoms. While the stabilization of cw-optical links is now a well established technique even on long distances, phase stable links for pulsed light pose additional challanges and have not been demonstrated so far. In addition to possible temperature or pressure drift of the laboratory, which may lead to a Doppler shift by steadily changing the optical path length, the pulsing of the clock laser light calls for short settling times of stabilization locks. Our optical path length stabilization uses retro-reflected light from a mirror that is fixed with respect to the interrogated atoms and synthetic signals during the dark time. Length changes and frequency chirps are compensated for by the switching AOM. For our strontium optical lattice clock we have ensured that the shift introduced by the fiber link including the pulsing acousto optic modulator is below $2\cdot 10^{-17}$.