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Observation and absolute frequency measurements of the 1S0 - 3P0 optical clock transition in ytterbium | | C. W. Hoyt
; Z. W. Barber
; C. W. Oates
; T. M. Fortier
; S. A. Diddams
; L. Hollberg
; | | Date: |
31 Mar 2005 | | Subject: | Atomic Physics | physics.atom-ph | | Affiliation: | 1 and 2), C. W. Oates , T. M. Fortier (1 and 3), S. A. Diddams , L. Hollberg ( National Institute of Standards and Technology, University of Colorado, Boulder, Los Alamos National Laboratory | | Abstract: | We report the direct excitation of the highly forbidden (6s^2) 1S0 - (6s6p) 3P0 optical transition in two odd isotopes of ytterbium. As the excitation laser frequency is scanned, absorption is detected by monitoring the depletion from an atomic cloud at ~70 uK in a magneto-optical trap. The measured frequency in 171Yb (F=1/2) is 518,295,836,593.2 +/- 4.4 kHz. The measured frequency in 173Yb (F=5/2) is 518,294,576,850.0 +/- 4.4 kHz. Measurements are made with a femtosecond-laser frequency comb calibrated by the NIST cesium fountain clock and represent nearly a million-fold reduction in uncertainty. The natural linewidth of these J=0 to J=0 transitions is calculated to be ~10 mHz, making them well-suited to support a new generation of optical atomic clocks based on confinement in an optical lattice. | | Source: | arXiv, physics/0503240 | | Services: | Forum | Review | PDF | Favorites | |
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