Simulação de Monte Carlo do transporte da luz em vapor atômico ressonante

Abstract

The transport of light through a resonant atomic vapor can be understood as a random walk characterized by multiple scattering events, where during each scattering event both the direction and the frequency of the photons are redistributed. In this work, we detail the development of a Monte Carlo simulation to study the effects of frequency redistribution during the transport of light through a resonant atomic vapor. We perform Monte Carlo simulations to find evidence of Rayleigh scattering for incident detuning near resonance. We compare perpendicular fluorescence spectra generated by the simulation with experimental perpendicular fluorescence spectra, both for cesium vapor excited around the 𝐷𝐷1 line. We also compare perpendicular fluorescence spectra generated by the simulation with experimental perpendicular fluorescence, considering a fixed absorption coefficient, and thus eliminating geometrical effects due to the spatial distribution of excited atoms in the vapor. The simulation was able to reproduce known physical phenomena such as velocity selection and partial redistribution curves found in the literature. We were also able to present evidence of Rayleigh scattering near the atomic transition.