中文摘要：

关于基于标准的光频率的发展的研究套住，有在 729 nm 的 4s 2S1/2-3d 2D5/2 钟转变的冷 40Ca+ 被报导。一个单个钙离子在陷井在保罗陷井和停留被套住，激光冷却了超过 15 天。729 nm 激光的线宽被锁住到一个洞为归结为不到 10 Hz 比 50 个小时长不间断地。钟转变的全面系统的无常被描绘了比 6.5 敭瑮琠慲獮潰瑲瑡潩 ? 牦浯琠敨 ?L 敩戠慬歮瑥愠摮戠獡浥湥 ?潲 c 好

英文摘要：

Research on the development of the optical frequency standard based on trapped and cold ^40Ca＋ with the 4s 2S1/2-3d 2D5/2 clock transition at 729 nm is reported. A single calcium ion was trapped and laser cooled in the Paul trap and stay in trap for more than 15 days. The linewidth of a 729 nm laser was reduced to less than 10 Hz by locking to a cavity for longer than 50 hours uninterruptedly. The overall systematic uncertainty of the clock transition has been characterized to be better than 6.5×10^-16. The absolute frequency of the clock transition was measured at 10-15 level using an optical frequency comb referenced to a Hydrogen maser, which was calibrated to the SI second through the global positioning system （GPS）. The frequency value was 411042129776393.0（1.6） Hz after the correction of the systematic shifts.