| ATOMIC AND MOLECULAR PHYSICS |
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Observation of Spin Polarized Clock Transition in 87Sr Optical Lattice Clock |
| WANG Qiang1,2**, LIN Yi-Ge1, LI Ye1,2, LIN Bai-Ke1,2, MENG Fei1, ZANG Er-Jun1, LI Tian-Chu1, FANG Zhan-Jun1 |
1National Institute of Metrology, Beijing 100013
2Department of Precision Instrument, Tsinghua University, Beijing 100084
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| Cite this article: |
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WANG Qiang, LIN Yi-Ge, LI Ye et al 2014 Chin. Phys. Lett. 31 123201 |
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Abstract We report our observation of the spin polarized 1S0→ 3P0 clock transition spectrum in an optical lattice clock based on fermionic 87Sr. The atoms are trapped and pre-cooled to about 2 μK with two stages of laser cooling at 461 nm and 689 nm, respectively. Then the atoms are loaded into an optical lattice formed by the interference of counter-propagating laser beams at 813 nm. An external cavity diode laser at 698 nm, which is stabilized to a high finesse cavity with a linewidth of about 5 Hz and a drift rate of less than 0.2 Hz/s, is used to excite the atoms to the 3P0 state. The π-polarized clock transition spectrum of resolvable mF states is obtained by applying a small bias magnetic field along the polarization axis of the probe beam. A spin polarized clock transition spectrum as narrow as 10 Hz with an 80 ms probe pulse is obtained.
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Published: 12 January 2015
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| PACS: |
32.30.Jc
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(Visible and ultraviolet spectra)
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32.70.Jz
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(Line shapes, widths, and shifts)
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37.10.Gh
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(Atom traps and guides)
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37.10.Jk
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(Atoms in optical lattices)
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42.50.Gy
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(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
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