Temperature shift suppression scheme for two-photon two-color rubidium vapor clocks

TL;DR

This paper introduces a novel rubidium vapor clock scheme that effectively suppresses temperature and pressure shifts without compromising AC Stark shift suppression, significantly enhancing signal-to-noise ratio using modulation transfer techniques.

Contribution

The paper presents a new interrogation scheme for rubidium vapor clocks that compensates for multiple frequency shifts and improves signal quality without trade-offs.

Findings

Effective suppression of temperature and pressure-induced shifts.

Two-orders of magnitude increase in signal-to-noise ratio.

No trade-off between AC Stark suppression and environmental sensitivities.

Abstract

We propose a new scheme for interrogating a warm rubidium vapor using two different clock lasers. Performance-wise, this approach is distinctly different from the recently proposed two-color two-photon rubidium clocks as our scheme does not trade off the AC Stark suppression against an increased sensitivity to the cell-temperature/pressure. Instead, our approach compensates all, the AC-Stark shift and the temperature & pressure-induced frequency shifts. The proposed scheme also makes use of the modulation transfer technique, which enables a two-orders of magnitude increase in the signal-to-noise ratio compared to traditional clocks that rely on fluorescence measurements.