The pulsed rubidium clock.
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 r = 3 x 10(14) 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.
Istituto Elettrotecnico Nazionale G. Ferraris, Strada delle Cacce 91, 10135 Torino, Italy.
Aldo
A
Godone
Salvatore
S
Micalizio
Claudio E
CE
Calosso
Filippo
F
Levi