Tailored optical properties of atomic medium by a narrow bandwidth frequency comb

TL;DR

This paper explores how a narrow bandwidth frequency comb influences atomic optical properties, revealing quantum interference effects and phase-dependent phenomena in rubidium atoms, with potential applications in quantum devices.

Contribution

It introduces a microscopic model using the Lindblad master equation to analyze the interaction of a narrow bandwidth frequency comb with atomic ensembles, highlighting phase control and multiple Larmor frequency effects.

Findings

Enhanced optical activity due to quantum interference

Phase-dependent magnetic resonances observed

Control of physical processes via light ellipticity

Abstract

The quantum interference assisted enhanced optical activity due to the emergence of a steady-state atomic polarization is investigated. The Rubidium atoms in an antirelaxation coated cell provide a suitable platform to address the phenomena at multiple Larmors frequencies. It interacts with a narrow bandwidth frequency comb generated by the frequency modulation of the light field. The Lindblad master equation with a trichromatic field provides a microscopic picture of the atomic response to the narrow bandwidth frequency comb. The directive of the relative phase between the light fields, in the detuning dependence of the magnetic resonances, is conclusively captured with the trichromatic field model. The measured absorption, nonlinear magneto-optic rotation, and their dependencies on various experimental parameters are analysed. The ellipticity of the light field controls the extent of several physical processes at multiple Larmors frequencies. The investigation provides an approach to address the Zeeman coherence in the interaction of a narrow bandwidth frequency comb with an atomic ensemble and will have applications in various quantum devices.