Santra Robin, Arimondo Ennio, Ido Tetsuya, Greene Chris H, Ye Jun
JILA, National Institute of Standards and Technology and University of Colorado, Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA.
Phys Rev Lett. 2005 May 6;94(17):173002. doi: 10.1103/PhysRevLett.94.173002. Epub 2005 May 4.
An optical atomic clock scheme is proposed that utilizes two lasers to establish coherent coupling between the 5s2 1S0 ground state of 88Sr and the first excited state, 5s5p 3P0. The coupling is mediated by the broad 5s5p 1P1 state, exploiting the phenomenon of electromagnetically induced transparency. The effective linewidth of the clock transition can be chosen at will by adjusting the laser intensity. By trapping the 88Sr atoms in an optical lattice, long interaction times with the two lasers are ensured; Doppler and recoil effects are eliminated. Based on a careful analysis of systematic errors, a clock accuracy of better than 2 x 10(-17) is expected.
提出了一种光学原子钟方案，该方案利用两台激光器在88Sr的5s2 1S0基态与第一激发态5s5p 3P0之间建立相干耦合。这种耦合由宽的5s5p 1P1态介导，利用了电磁感应透明现象。通过调整激光强度，可以随意选择时钟跃迁的有效线宽。通过将88Sr原子捕获在光学晶格中，确保了与两台激光器的长相互作用时间；消除了多普勒效应和反冲效应。在对系统误差进行仔细分析的基础上，预计时钟精度优于2×10^(-17)。
