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Acta Optica Sinica

Trapping Four Isotopes of Strontium in a MOT by Using Zeeman Slowing

田晓 Tian Xiao, 常宏 Chang Hong, 王心亮 Wang Xinliang, Shougang Zhang

Published Jan 1, 2010• 6 citations
Publisher
DOI
10.3788/aos20103003.0898

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Chinese Physics Letters•Oct 1, 2008•16 citations
The isotope selectivity of the strontium (Sr) magneto-optical trap (MOT) is measured by a time-of-flight (TOF) mass spectrometer. The thermally generated Sr atoms are slowed down by the Zeeman slowing technique and trapped by the magneto-optical method. The trapped atoms are photoionized by the nonresonant two-photon ionization, and the generated ions are analyzed by the TOF mass spectrometer. The isotope selectivity of the MOT is up to approximately 2000 for 86Sr, and the overall selectivity of the system, which consists of the MOT and the mass spectrometer is also discussed.
We report the realization of ytterbium magneto-optical trap (MOT) operating on the dipole-allowed 1 S 0 — 1 P 1 transition at 398.9 nm. The MOT is loaded by a slowed atomic beam produced by a Zeeman slower. All seven stable isotopes of Yb atoms could be trapped separately at different laser detuning values. Over 10 7 174 Yb atoms are collected in the MOT, whereas the atom number of fermionic isotope 171 Yb is roughly 2.3 × 10 6 due to a lower abundance. Without the Zeeman slower, the trapped atom numbers are one order of magnitude lower. Both the even and odd isotopes are recognized as excellent candidates of optical clock transition, so the cooling and trapping of ytterbium atoms by the blue MOT is an important step for building an optical clock.