Trapped ion 88Sr+ optical clock systematic uncertainties - AC Stark shift determination

8th Symposium on Frequency Standards and Metrology 2015

Barwood, G.P.^1 ; Huang, G.^1 ; King, S.A.^1 ; Klein, H.A.^1 ; Gill, P.^1

National Physical Laboratory, Teddington, Middlesex

TW11 OLW, United Kingdom^1

关键词: Absolute frequency;    Blackbody radiation shift;    Calculated values;    Dynamic correction;    Experimental verification;    National Physical Laboratory;    Systematic uncertainties;    Uncertainty contributions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/723/1/012024/pdf
DOI  :  10.1088/1742-6596/723/1/012024

来源: IOP

【 摘 要 】

A recent comparison between two trapped-ion88Sr+optical clocks at the UK. National Physical Laboratory demonstrated agreement to 4 parts in 1017. One of the uncertainty contributions to the optical clock absolute frequency arises from the blackbody radiation shift which in turn depends on uncertainty in the knowledge of the differential polarisability between the two clocks states. Whilst a recent NRC measurement has determined the DC differential polarisability to high accuracy, there has been no experimental verification to date of the dynamic correction to the DC Stark shift. We report a measurement of the scalar AC Stark shift at 1064 nm with measurements planned at other wavelengths. Our preliminary result using a fibre laser at 1064 nm agrees with calculated values to within ∼3%.