The polarization of two-level atom in the polychromatic weak field

TL;DR

This paper investigates the polarization behavior of a two-level atom in a polychromatic weak field, revealing nonlinear effects in the spectrum that are crucial for accurate comb spectroscopy analysis.

Contribution

It provides a numerical solution for polarization in polyharmonic fields and an analytical solution for symmetrical frequency arrangements, highlighting nonlinear effects.

Findings

Nonlinear features appear in polarization spectra even at small amplitudes.

Nonlinear effects are significant for interpreting comb spectroscopy spectra.

Analytical solutions are derived for symmetrical frequency configurations.

Abstract

The numerical solution for polarization for two-level atom in polyharmonic field has been made. The analytical solution for partial case of symmetrical position of carrier frequency relative to transition frequency is possible. The results showed that the nonlinear features in polarization spectrum take place even for small amplitudes of comb-components for small frequency distance between them. It means that it is necessary to take into account nonlinear effects for interpretation of spectra in comb spectroscopy.