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arXiv 0904.0285physics.opticsphysics.atom-ph
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基于碱土离子相干布居俘获的光钟

An Optical Clock Based on Coherent Population Trapping of Alkaline-earth Ions

Z. H. Lu, L. J. Wang

摘要:

分析了一种基于碱土金属离子Ca $^+$、Sr $^+$、Ba $^+$相干布居俘获效应的超稳定光钟。所提出的跃迁使用奇数同位素,因此频移对所施加的磁场不敏感。为了增强信号,大量离子被捕获在线性Paul阱中,并且激光冷却以结晶,使得离子处于Lamb-Dicke状态以避免一阶多普勒频移。其他相关的频率偏移也进行了分析。进一步的技术,以提高时钟信号的稳定性进行了讨论。

英文摘要:

An ultra-stable optical clock based on coherent population trapping effect of alkaline-earth ions, such as Ca$^+$, Sr$^+$, Ba$^+$, is analyzed here. The proposed transitions use the odd isotopes, so that the frequency shift is insensitive to the applied magnetic field. To enhance the signal, a large number of ions are trapped in a linear Paul trap, and laser cooled to crystallize such that the ions are in the Lamb-Dicke regime to avoid first order Doppler shift. Other relevant frequency shifts are also analyzed. Further techniques to improve the stability of the clock signal are discussed.

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