Evaluation of blackbody-radiation frequency shift in strontium optical lattice clock

Precision calculation of blackbody radiation shifts for optical frequency metrology.

We show that three group IIIB divalent ions, B(+), Al(+), and In(+), have anomalously small blackbody radiation (BBR) shifts of the ns(2) (1)S(0)-nsnp (3)P(0)(o) clock transitions. The fractional BBR shifts for these ions are at least 10 times smaller than those of any other present or proposed optical frequency standards at the same temperature, and are less than 0.3% of the Sr clock shift. We...

Optical Cavity for the Strontium Lattice Atomic Clock

The Sr lattice atomic clock in Jun Ye’s group has been experiencing frequency shifts due to the interaction between the Sr atoms in the optical trap. One possible solution is to change the optical trap in the system such that the Sr atom density, and therefore the interaction between the atoms, is reduced. For this project a test system is necessary to test the vacuum chamber viewports, which i...

Multipolar theory of blackbody radiation shift of atomic energy levels and its implications for optical lattice clocks

Blackbody radiation BBR shifts of the P0S0 clock transition in the divalent atoms Mg, Ca, Sr, and Yb are evaluated. The dominant electric-dipole contributions are computed using accurate relativistic many-body techniques of atomic structure. At room temperatures, the resulting uncertainties in the E1 BBR shifts are large and substantially affect the projected 10−18 fractional accuracy of the op...

High-accuracy calculation of the blackbody radiation shift in the 133Cs primary frequency standard.

The blackbody radiation (BBR) shift is an important systematic correction for the atomic frequency standards realizing the SI unit of time. Presently, there is controversy over the value of the BBR shift for the primary 133Cs standard. At room temperatures, the values from various groups differ at the 3x10(-15) level, while modern clocks are aiming at 10(-16) accuracies. We carry out high-preci...

The Strontium Optical Lattice Clock: Optical Spectroscopy with Sub-Hertz Accuracy