Frequency matching in light storage spectroscopy of atomic Raman transitions

TL;DR

This paper explores how light can be stored and retrieved in atomic systems using EIT, revealing that the retrieved light's frequency matches the two-photon resonance, enabling high-precision measurements.

Contribution

It demonstrates experimentally and theoretically that the carrier frequency of retrieved light matches the two-photon resonance, independent of input pulse detuning, enhancing precision in optical measurements.

Findings

Carrier frequency matches two-photon resonance within EIT window

Effect is not based on spectral filtering

Applicable for high-speed precision measurements

Abstract

We investigate the storage of light in an atomic sample with a lambda-type coupling scheme driven by optical fields at variable two-photon detuning. In the presence of electromagnetically induced transparency (EIT), light is stored and retrieved from the sample by dynamically varying the group velocity. It is found that for any two-photon detuning of the input light pulse within the EIT transparency window, the carrier frequency of the retrieved light pulse matches the two-photon resonance frequency with the atomic ground state transition and the control field. This effect which is not based on spectral filtering is investigated both theoretically and experimentally. It can be used for high-speed precision measurements of the two-photon resonance as employed e.g. in optical magnetometry.