Mistura de quatro ondas multicanal em vapor atômico

Abstract

Many interesting nonlinear phenomena arise from the interaction between light and matter. Our goal is to observe one of the most exciting nonlinear phenomena that arise in atomic vapors when they interact with laser light under certain conditions and that may be of interest for future applications in areas such as optics and quantum information. In this work we investigate experimentally and theoretically the process of Four-Wave Mixing (FWM). In our experiment, this process is obtained when two laser beams are incident on a cell containing a vapor of cesium atoms at the D2(6S1/2 → 6P3/2 ) line transition of the 133Cs isotope. With an experimental set-up containing a 1 mm Cs cell, we were able to obtain the Four-Wave Mixing signals. Four channels were generated and some preliminary results were analyzed. We were able to observe sub-Doppler peaks in the spectra obtained in our measurements, which are unusual results in FWM for heated atomic vapors. As well as continuing with the analysis of the spectra, we began the quantitative characterization of the Four-Wave Mixing process, carrying out theoretical modelling using the density matrix formalism, which has helped us to understand its behaviour more precisely, bringing more accurate results to our research. Our expectation is that the experimental system will serve to use atoms as optical information multiplexers.