Temperature Dependence Cancellation of the Cs Clock Frequency in the Presence of Ne Buffer Gas

TL;DR

This study investigates how the temperature dependence of the Cs clock transition frequency in a Ne-buffered vapor cell can be canceled, enhancing the stability of atomic clocks.

Contribution

It provides experimental measurements of the quadratic temperature dependence and identifies the temperature at which the frequency shift cancels.

Findings

Quadratic temperature dependence of the Cs clock frequency shift.

Determination of the temperature for shift cancellation.

Measurement of Cs-Ne collisional temperature coefficients.

Abstract

The temperature dependence of the Cs clock transition frequency in a vapor cell filled with Ne buffer gas has been measured. The experimental setup is based on the coherent population trapping (CPT) technique and a temporal Ramsey interrogation allowing a high resolution. A quadratic dependence of the frequency shift is shown. The temperature of the shift cancellation is evaluated. The actual Ne pressure in the cell is determined from the frequency shift of the 895nm optical transition. We can then determine the Cs-Ne collisional temperature coefficients of the clock frequency. These results can be useful for vapor cell clocks and especially for future micro-clocks.