We report on the measurement of an anomalously large temperature sensitivity of the clock frequency in a Rb cell with buffer gas. The effect is observed in a prototype of pulsed optically pumped frequency standard which allows high resolution measurements because of its frequency stability at the level 1.7 x 10^-13 for 1 s of measurement time. We attribute this phenomenon to the geometry of the interaction and to the presence in the cell of temperature inhomogeneities that may enhance the temperature sensitivity of the clock frequency via the buffer gas pressure coefficient. We also propose some solutions to reduce this unwanted effect that may limit the medium-long-term performances of highfrequency- stability vapor-cell clocks.
Enhanced temperature sensitivity in vapor-cell frequency standards / Calosso, CLAUDIO ELIGIO; Godone, A; Levi, Filippo; Micalizio, Salvatore. - In: IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL. - ISSN 0885-3010. - 59:12(2012), pp. 2646-2654. [10.1109/TUFFC.2012.2505]
Enhanced temperature sensitivity in vapor-cell frequency standards
CALOSSO, CLAUDIO ELIGIO;LEVI, FILIPPO;MICALIZIO, SALVATORE
2012
Abstract
We report on the measurement of an anomalously large temperature sensitivity of the clock frequency in a Rb cell with buffer gas. The effect is observed in a prototype of pulsed optically pumped frequency standard which allows high resolution measurements because of its frequency stability at the level 1.7 x 10^-13 for 1 s of measurement time. We attribute this phenomenon to the geometry of the interaction and to the presence in the cell of temperature inhomogeneities that may enhance the temperature sensitivity of the clock frequency via the buffer gas pressure coefficient. We also propose some solutions to reduce this unwanted effect that may limit the medium-long-term performances of highfrequency- stability vapor-cell clocks.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
