Dark resonances in the field of frequency shifted feedback laser radiation

TL;DR

This paper develops a theoretical model for dark resonances in a three-level atomic system interacting with a frequency shifted feedback laser, highlighting conditions for optimal resonance observation and analyzing spectral effects.

Contribution

It introduces a new theoretical framework for understanding dark resonances in FSF laser fields, including conditions for resonance and spectral broadening effects.

Findings

Resonances are optimal when phase relations generate light pulse trains.

Analytical expressions for field broadening and light shifts are provided.

Conditions for observing dark resonances are identified.

Abstract

We present a theory of dark resonances in a fluorescence of a three-level atom gas interacting with a polychromatic field of a frequency shifted feedback (FSF) laser. We show that conditions for the resonance observation are optimal when the phase relations between the laser spectral components provide generation of a light pulses train. We study analytically the field broadening and the light shift of the resonances.