Characterization of frequency stability in EIT-based atomic clocks using a differential detection scheme

TL;DR

This paper explores a differential detection scheme for EIT-based atomic clocks, demonstrating significant noise suppression and an order of magnitude improvement in clock stability through experimental investigation.

Contribution

It introduces a differential detection approach for EIT atomic clocks that enhances stability by reducing laser noise, a novel application of this technique.

Findings

Laser noise suppression improves signal-to-noise ratio

Order of magnitude stability enhancement achieved

Differential detection effectively reduces noise in EIT clocks

Abstract

We investigate a recently proposed scheme for differential detection of the magneto-optical rotation effect and its application to electromagnetically induced transparency (EIT) atomic clocks. This scheme utilizes a linearly polarized bichromatic laser field that is EIT-resonant with alkali atoms. The results of our study reveal that the suppression of the laser noise can substantially improve the signal-to-noise ratio in EIT atomic clocks. Our preliminary results demonstrate an order of magnitude improvement in clock stability under some conditions when incorporating the differential detection scheme