Resonant interaction between an ultrashort pulse train and a two-level system: frequency domain analysis

TL;DR

This paper analyzes how ultrashort pulse trains interact with two-level atoms in the frequency domain, revealing the effects of mode number on atomic coherence at different intensities through analytical and numerical methods.

Contribution

It provides a perturbative analytical solution at low intensities and numerical analysis at high intensities to understand mode effects in atom-light interactions.

Findings

Mode number influences atomic coherence near resonance.

High-intensity interactions reach steady state with distinct mode effects.

Analytical and numerical methods complement each other in analysis.

Abstract

We investigate the problem of two-level atoms driven by an ultrashort pulse train in the frequency domain. At low intensity regime, we obtain a perturbative analytical solution that allows us to discuss the role of the mode number of the frequency comb near or at resonance on the temporal evolution of the atomic coherence. At high intensities, the effect of the number of modes is analyzed in the steady-state regime through numerical calculations.