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      The 87-Sr optical frequency standard at PTB

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          Abstract

          With 87-Sr atoms confined in a one dimensional optical lattice, the frequency of the optical clock transition 5s^2 ^1S_0 - 5s5p ^3P_0 has been determined to be 429 228 004 229 872.9(5) Hz. The transition frequency was measured with the help of a fs-frequency comb against one of PTB's H-masers whose frequency was measured simultaneously by the PTB Cs fountain clock CSF1. The Sr optical frequency standard contributes with a fractional uncertainty of 1.5 10^-16 to the total uncertainty. The agreement of the measured transition frequency with previous measurements at other institutes supports the status of this transition as secondary representation of the second with the currently smallest uncertainty.

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          Collisional losses, decoherence, and frequency shifts in optical lattice clocks with bosons

           ,  ,   (2009)
          We have quantified collisional losses, decoherence and the collision shift in a one-dimensional optical lattice clock with bosonic 88Sr. The lattice clock is referenced to the highly forbidden transition 1S0 - 3P0 at 698 nm, which becomes weakly allowed due to state mixing in a homogeneous magnetic field. We were able to quantify three decoherence coefficients, which are due to dephasing collisions, inelastic collisions between atoms in the upper and lower clock state, and atoms in the upper clock state only. Based on the measured coefficients, we determine the operation parameters at which a 1D-lattice clock with 88Sr shows no degradation due to collisions on the relative accuracy level of 10-16.
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            Metrological analysis of the LIDFT method

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              Author and article information

              Journal
              26 April 2011
              2011-08-26
              Article
              10.1088/0026-1394/48/5/022
              1104.4850

              http://arxiv.org/licenses/nonexclusive-distrib/1.0/

              Custom metadata
              Metrologia 48 (2011) 399--407
              9 pages, 6 figures
              physics.atom-ph

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