In-situ ac Stark shift Detection in Light Storage Spectroscopy

TL;DR

This paper introduces a method to measure ac Stark shifts in light storage experiments, revealing their dependence on control field intensity and insensitivity to signal field fluctuations, which benefits precision measurements.

Contribution

The study demonstrates a novel approach using light storage spectroscopy to detect ac Stark shifts and analyze their dependence on control and signal fields.

Findings

Linear dependence of light shift on control field intensity

Insensitivity of light shift to signal field intensity

Potential for improved precision in light storage measurements

Abstract

We report on a method for measuring ac Stark shifts observed in stored light experiments while simultaneously determining the energetic splitting between the electronic ground states involved in the two-photon transition. To this end we make use of the frequency matching effect in light storage spectroscopy. We find a linear dependence on the intensity of the control field applied during the retrieval phase of the experiment. At the same time, we observe that the light shift is insensitive to the intensity of the signal field which is in contrast to continuously operated schemes using electromagnetically induced transparency (EIT) or coherent population trapping (CPT). Our results may be of importance for future light storage-based precision measurements with EIT and CPT-type devices where, in contrast to schemes using continuous exposure to optical fields, the impact of intensity fluctuations from the signal field can be suppressed.