Abstract

In general, the linewidth of the Ramsey central fringe (RCF) is equal to $1/(2T)$, where $T$ is the Ramsey free-evolution time. We demonstrate that the RCF linewidth of a pulsed optically pumped (POP) atomic clock with orthogonal polarization detection based on the magneto-optical rotation effect can be narrowed down to $1/(4T)$. The Allan deviation of the POP atomic clock decreases from $2.4\times {10}^{-13}{\tau }^{-1/2}$ to $1.4\times {10}^{-13}{\tau }^{-1/2}$. This corresponds to an improvement in the frequency stability by about 60%. We also estimate the main noise sources that limit the short-term frequency stability of the POP atomic clock.

© 2018 Optical Society of America

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