Correlation spectroscopy in cold atoms: light sidebands resonances in electromagnetically induced transparency condition

TL;DR

This paper investigates how sidebands of intense fields influence correlation spectroscopy measurements of electromagnetically induced transparency in cold atoms, revealing conditions for resolving sideband resonances.

Contribution

It introduces a detailed analysis of sideband effects in EIT correlation spectroscopy and demonstrates the importance of one-photon detuning for spectral resolution.

Findings

Sidebands significantly affect correlation spectra in EIT.

Non-zero one-photon detuning enables spectral resolution of sidebands.

Experimental results align with the frequency domain perturbative model.

Abstract

The correlation spectroscopy has been successfully employed in the measurement of the intrinsic linewidth of electromagnetically induced transparency (EIT) in time and frequency domain. We study the role of the sidebands of the intense fields in the measured spectra, analyzing the information that can be recovered working with different analysis frequencies. In this case, the non-zero one-photon detuning appears as a necessary condition for spectrally resolving the sideband resonances in the correlation coefficient. Our experimental findings are supported by the perturbative model defined in the frequency domain.