Realization of a pulsed optically pumped Rb clock with a frequency stability below \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$10^{-15}$$\end{document}10-15

• Published in: Scientific reports Vol. 13
• Main Authors: Gozzelino, Michele, Micalizio, Salvatore, Calosso, Claudio E., Belfi, Jacopo, Sapia, Adalberto, Gioia, Marina, Levi, Filippo
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 10-08-2023
• ISSN: 2045-2322
• DOI: 10.1038/s41598-023-39942-5

We present the frequency stability performances of a vapor cell Rb clock based on the pulsed optically pumping (POP) technique. The clock has been developed in the frame of a collaboration between INRIM and Leonardo SpA, aiming to realize a space-qualified POP frequency standard. The results here reported were obtained with an engineered physics package, specifically designed for space applications, joint to laboratory-grade optics and electronics. The measured frequency stability expressed in terms of Allan deviation is
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\begin{document}$$1.2\times 10^{-13}$$\end{document}
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at 1s and achieves the value of
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\begin{document}$$6\times 10^{-16}$$\end{document}
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for integration times of 40000 s (drift removed). This is, to our knowledge, a record result for a vapor-cell frequency standard. In the paper, we show that in order to get this result, a careful stabilization of microwave and laser pulses is required.