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The pulsed rubidium clock
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DOI：10.1109/TUFFC.2006.1610560.png)
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In this paper, we describe a laboratory prototype of pulsed optically pumped clock based on a rubidium vapor cell with buffer gas. The measured frequency stability (overlapping Allan deviation) is sigma(y) (tau) = 3 x 10(-12) tau(-1/2) and the level of 4 x 10(-14) is reached for averaging time of tau = 3 x 10(4) s. For the same set of data, the statistical tool Theol predicts a frequency stability of 2 x 10(-14) for tau = 10(5) s. This result confirms the theoretical predictions regarding this kind of frequency standard and makes it very attractive for satellite navigation and space applications in which a simple and reliable implementation is required, and the short and medium term stability (till one day) is the main concern.
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