Light shifts in a pulsed cold-atom coherent-population-trapping clock
Eric M. Blanshan, Elizabeth A. Donley, John E. Kitching
Field-grade atomic clocks capable of primary standard performance in compact physics packages would be of significant value in a variety of applications. A cold-atom coherent population trapping clock featuring laser-cooled 87Rb atoms and pulsed Ramsey interrogation is a strong candidate for this technology if the frequency biases can be minimized and controlled. Here we characterize the AC-stark effect in the lin I I lin CPT scheme, explaining observed light shifts in terms of contributions from coherent CPT-generating couplings and optical-pumping effects caused by incoherent light. Measurements are compared with existing and new theoretical treatments, and a laser configuration is identified that reduces clock drift from light shifts to -14 for the current system.
, Donley, E.
and Kitching, J.
Light shifts in a pulsed cold-atom coherent-population-trapping clock, Physical Review Letters, [online], https://doi.org/10.1103/PhysRevA.91.041401
(Accessed July 2, 2022)